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415 lines
16 KiB
Markdown
415 lines
16 KiB
Markdown
# SQLite Compatibility
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This document describes the SQLite compatibility status of Limbo:
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- [SQLite Compatibility](#sqlite-compatibility)
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- [Limitations](#limitations)
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- [SQL statements](#sql-statements)
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- [SELECT Expressions](#select-expressions)
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- [SQL functions](#sql-functions)
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- [Scalar functions](#scalar-functions)
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- [Aggregate functions](#aggregate-functions)
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- [Date and time functions](#date-and-time-functions)
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- [JSON functions](#json-functions)
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- [SQLite API](#sqlite-api)
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- [SQLite VDBE opcodes](#sqlite-vdbe-opcodes)
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## Limitations
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* Limbo does not support database access from multiple processes.
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## SQL statements
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| Statement | Status | Comment |
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|------------------------------|---------|---------|
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| ALTER TABLE | No | |
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| ANALYZE | No | |
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| ATTACH DATABASE | No | |
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| BEGIN TRANSACTION | No | |
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| COMMIT TRANSACTION | No | |
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| CREATE INDEX | No | |
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| CREATE TABLE | Partial | |
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| CREATE TRIGGER | No | |
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| CREATE VIEW | No | |
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| CREATE VIRTUAL TABLE | No | |
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| DELETE | No | |
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| DETACH DATABASE | No | |
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| DROP INDEX | No | |
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| DROP TABLE | No | |
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| DROP TRIGGER | No | |
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| DROP VIEW | No | |
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| END TRANSACTION | No | |
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| EXPLAIN | Yes | |
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| INDEXED BY | No | |
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| INSERT | Partial | |
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| ON CONFLICT clause | No | |
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| PRAGMA | Partial | |
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| PRAGMA cache_size | Yes | |
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| REINDEX | No | |
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| RELEASE SAVEPOINT | No | |
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| REPLACE | No | |
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| RETURNING clause | No | |
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| ROLLBACK TRANSACTION | No | |
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| SAVEPOINT | No | |
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| SELECT | Partial | |
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| SELECT ... WHERE | Partial | |
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| SELECT ... WHERE ... LIKE | Yes | |
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| SELECT ... LIMIT | Yes | |
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| SELECT ... ORDER BY | Partial | |
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| SELECT ... GROUP BY | Partial | |
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| SELECT ... HAVING | Partial | |
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| SELECT ... JOIN | Partial | |
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| SELECT ... CROSS JOIN | Partial | |
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| SELECT ... INNER JOIN | Partial | |
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| SELECT ... OUTER JOIN | Partial | |
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| SELECT ... JOIN USING | Yes | |
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| SELECT ... NATURAL JOIN | Yes | |
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| UPDATE | No | |
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| UPSERT | No | |
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| VACUUM | No | |
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| WITH clause | No | |
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### SELECT Expressions
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Feature support of [sqlite expr syntax](https://www.sqlite.org/lang_expr.html).
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| Syntax | Status | Comment |
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|------------------------------|---------|---------|
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| literals | Yes | |
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| schema.table.column | Partial | Schemas aren't supported |
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| unary operator | Partial | `-` supported, `+~` aren't |
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| binary operator | Partial | Only `%`, `!<`, and `!>` are unsupported |
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| agg() FILTER (WHERE ...) | No | Is incorrectly ignored |
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| ... OVER (...) | No | Is incorrectly ignored |
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| (expr) | Yes | |
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| CAST (expr AS type) | Yes | |
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| COLLATE | No | |
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| (NOT) LIKE | No | |
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| (NOT) GLOB | No | |
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| (NOT) REGEXP | No | |
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| (NOT) MATCH | No | |
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| IS (NOT) | No | |
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| IS (NOT) DISTINCT FROM | No | |
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| (NOT) BETWEEN ... AND ... | No | |
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| (NOT) IN (subquery) | No | |
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| (NOT) EXISTS (subquery) | No | |
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| CASE WHEN THEN ELSE END | Yes | |
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| RAISE | No | |
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## SQL functions
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### Scalar functions
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| Function | Status | Comment |
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|------------------------------|--------|---------|
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| abs(X) | Yes | |
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| changes() | No | |
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| char(X1,X2,...,XN) | Yes | |
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| coalesce(X,Y,...) | Yes | |
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| concat(X,...) | Yes | |
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| concat_ws(SEP,X,...) | Yes | |
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| format(FORMAT,...) | No | |
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| glob(X,Y) | Yes | |
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| hex(X) | Yes | |
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| ifnull(X,Y) | Yes | |
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| iif(X,Y,Z) | Yes | |
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| instr(X,Y) | Yes | |
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| last_insert_rowid() | Yes | |
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| length(X) | Yes | |
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| like(X,Y) | No | |
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| like(X,Y,Z) | No | |
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| likelihood(X,Y) | No | |
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| likely(X) | No | |
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| load_extension(X) | No | |
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| load_extension(X,Y) | No | |
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| lower(X) | Yes | |
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| ltrim(X) | Yes | |
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| ltrim(X,Y) | Yes | |
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| max(X,Y,...) | Yes | |
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| min(X,Y,...) | Yes | |
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| nullif(X,Y) | Yes | |
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| octet_length(X) | Yes | |
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| printf(FORMAT,...) | No | |
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| quote(X) | Yes | |
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| random() | Yes | |
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| randomblob(N) | Yes | |
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| replace(X,Y,Z) | Yes | |
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| round(X) | Yes | |
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| round(X,Y) | Yes | |
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| rtrim(X) | Yes | |
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| rtrim(X,Y) | Yes | |
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| sign(X) | Yes | |
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| soundex(X) | Yes | |
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| sqlite_compileoption_get(N) | No | |
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| sqlite_compileoption_used(X) | No | |
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| sqlite_offset(X) | No | |
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| sqlite_source_id() | No | |
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| sqlite_version() | Yes | |
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| substr(X,Y,Z) | Yes | |
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| substr(X,Y) | Yes | |
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| substring(X,Y,Z) | Yes | |
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| substring(X,Y) | Yes | |
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| total_changes() | No | |
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| trim(X) | Yes | |
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| trim(X,Y) | Yes | |
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| typeof(X) | Yes | |
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| unhex(X) | Yes | |
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| unhex(X,Y) | Yes | |
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| unicode(X) | Yes | |
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| unlikely(X) | No | |
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| upper(X) | Yes | |
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| zeroblob(N) | Yes | |
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### Aggregate functions
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| Function | Status | Comment |
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|------------------------------|---------|---------|
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| avg(X) | Yes | |
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| count() | Yes | |
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| count(*) | Yes | |
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| group_concat(X) | Yes | |
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| group_concat(X,Y) | Yes | |
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| string_agg(X,Y) | Yes | |
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| max(X) | Yes | |
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| min(X) | Yes | |
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| sum(X) | Yes | |
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| total(X) | Yes | |
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### Date and time functions
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| Function | Status | Comment |
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|-------------|---------|------------------------------|
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| date() | Yes | partially supports modifiers |
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| time() | Yes | partially supports modifiers |
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| datetime() | No | |
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| julianday() | No | |
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| unixepoch() | Partial | does not support modifiers |
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| strftime() | No | |
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| timediff() | No | |
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### JSON functions
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| Function | Status | Comment |
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|------------------------------------|---------|---------|
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| json(json) | Partial | |
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| jsonb(json) | | |
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| json_array(value1,value2,...) | | |
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| jsonb_array(value1,value2,...) | | |
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| json_array_length(json) | | |
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| json_array_length(json,path) | | |
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| json_error_position(json) | | |
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| json_extract(json,path,...) | | |
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| jsonb_extract(json,path,...) | | |
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| json -> path | | |
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| json ->> path | | |
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| json_insert(json,path,value,...) | | |
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| jsonb_insert(json,path,value,...) | | |
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| json_object(label1,value1,...) | | |
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| jsonb_object(label1,value1,...) | | |
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| json_patch(json1,json2) | | |
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| jsonb_patch(json1,json2) | | |
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| json_pretty(json) | | |
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| json_remove(json,path,...) | | |
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| jsonb_remove(json,path,...) | | |
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| json_replace(json,path,value,...) | | |
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| jsonb_replace(json,path,value,...) | | |
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| json_set(json,path,value,...) | | |
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| jsonb_set(json,path,value,...) | | |
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| json_type(json) | | |
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| json_type(json,path) | | |
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| json_valid(json) | | |
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| json_valid(json,flags) | | |
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| json_quote(value) | | |
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| json_group_array(value) | | |
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| jsonb_group_array(value) | | |
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| json_group_object(label,value) | | |
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| jsonb_group_object(name,value) | | |
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| json_each(json) | | |
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| json_each(json,path) | | |
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| json_tree(json) | | |
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| json_tree(json,path) | | |
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## SQLite API
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| Interface | Status | Comment |
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|------------------------------|---------|---------|
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| sqlite3_open | Partial | |
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| sqlite3_close | Yes | |
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| sqlite3_prepare | Partial | |
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| sqlite3_finalize | Yes | |
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| sqlite3_step | Yes | |
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| sqlite3_column_text | Yes | |
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## SQLite VDBE opcodes
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| Opcode | Status |
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|-----------------|--------|
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| Add | Yes |
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| AddImm | No |
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| Affinity | No |
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| AggFinal | Yes |
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| AggStep | Yes |
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| AggStep | Yes |
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| And | No |
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| AutoCommit | No |
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| BitAnd | Yes |
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| BitNot | Yes |
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| BitOr | Yes |
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| Blob | Yes |
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| Checkpoint | No |
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| Clear | No |
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| Close | No |
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| CollSeq | No |
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| Column | Yes |
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| Compare | No |
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| Concat | No |
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| Copy | Yes |
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| Count | No |
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| CreateIndex | No |
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| CreateTable | No |
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| DecrJumpZero | Yes |
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| Delete | No |
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| Destroy | No |
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| Divide | Yes |
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| DropIndex | No |
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| DropTable | No |
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| DropTrigger | No |
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| EndCoroutine | Yes |
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| Eq | Yes |
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| Expire | No |
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| Explain | No |
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| FkCounter | No |
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| FkIfZero | No |
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| Found | No |
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| Function | Yes |
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| Ge | Yes |
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| Gosub | No |
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| Goto | Yes |
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| Gt | Yes |
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| Halt | Yes |
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| HaltIfNull | No |
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| IdxDelete | No |
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| IdxGE | No |
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| IdxInsert | No |
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| IdxLT | No |
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| IdxRowid | No |
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| If | Yes |
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| IfNeg | No |
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| IfNot | Yes |
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| IfPos | Yes |
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| IfZero | No |
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| IncrVacuum | No |
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| Init | Yes |
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| InitCoroutine | Yes |
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| Insert | No |
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| InsertAsync | Yes |
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| InsertAwait | Yes |
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| InsertInt | No |
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| Int64 | No |
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| Integer | Yes |
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| IntegrityCk | No |
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| IsNull | No |
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| IsUnique | No |
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| JournalMode | No |
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| Jump | No |
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| Last | No |
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| Le | Yes |
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| LoadAnalysis | No |
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| Lt | Yes |
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| MakeRecord | Yes |
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| MaxPgcnt | No |
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| MemMax | No |
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| Move | No |
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| Multiply | Yes |
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| MustBeInt | Yes |
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| Ne | Yes |
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| NewRowid | Yes |
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| Next | No |
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| NextAsync | Yes |
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| NextAwait | Yes |
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| Noop | No |
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| Not | No |
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| NotExists | Yes |
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| NotFound | No |
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| NotNull | Yes |
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| Null | Yes |
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| NullRow | Yes |
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| Once | No |
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| OpenAutoindex | No |
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| OpenEphemeral | No |
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| OpenPseudo | Yes |
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| OpenRead | Yes |
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| OpenReadAsync | Yes |
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| OpenWrite | No |
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| OpenWriteAsync | Yes |
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| OpenWriteAwait | Yes |
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| Or | No |
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| Pagecount | No |
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| Param | No |
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| ParseSchema | No |
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| Permutation | No |
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| Prev | No |
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| Program | No |
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| ReadCookie | No |
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| Real | Yes |
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| RealAffinity | Yes |
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| Remainder | No |
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| ResetCount | No |
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| ResultRow | Yes |
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| Return | No |
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| Rewind | Yes |
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| RewindAsync | Yes |
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| RewindAwait | Yes |
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| RowData | No |
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| RowId | Yes |
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| RowKey | No |
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| RowSetAdd | No |
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| RowSetRead | No |
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| RowSetTest | No |
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| Rowid | Yes |
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| SCopy | No |
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| Savepoint | No |
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| Seek | No |
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| SeekGe | No |
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| SeekGt | No |
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| SeekLe | No |
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| SeekLt | No |
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| SeekRowid | Yes |
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| Sequence | No |
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| SetCookie | No |
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| ShiftLeft | No |
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| ShiftRight | No |
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| SoftNull | Yes |
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| Sort | No |
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| SorterCompare | No |
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| SorterData | Yes |
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| SorterInsert | Yes |
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| SorterNext | Yes |
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| SorterOpen | Yes |
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| SorterSort | Yes |
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| String | No |
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| String8 | Yes |
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| Subtract | Yes |
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| TableLock | No |
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| ToBlob | No |
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| ToInt | No |
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| ToNumeric | No |
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| ToReal | No |
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| ToText | No |
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| Trace | No |
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| Transaction | No |
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| VBegin | No |
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| VColumn | No |
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| VCreate | No |
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| VDestroy | No |
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| VFilter | No |
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| VNext | No |
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| VOpen | No |
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| VRename | No |
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| VUpdate | No |
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| Vacuum | No |
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| Variable | No |
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| VerifyCookie | No |
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| Yield | Yes |
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