From afc94cd3be0a90db9db8e3050e00d916b6ebc2a5 Mon Sep 17 00:00:00 2001
From: Jussi Saurio <jussi.saurio@gmail.com>
Date: Sun, 18 May 2025 12:51:52 +0300
Subject: [PATCH] Add basic select distinct TCL test

---
 testing/subquery.test | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/testing/subquery.test b/testing/subquery.test
index 3eb2e3326..98ecec001 100644
--- a/testing/subquery.test
+++ b/testing/subquery.test
@@ -411,3 +411,25 @@ do_execsql_test subquery-ignore-unused-cte {
     sub as (select first_name from users where first_name = 'Jamie' limit 1) 
     select * from sub;
 } {Jamie}
+
+# Test verifying that select distinct works (distinct ages are 1-100)
+do_execsql_test subquery-count-distinct-age {
+    select count(1) from (select distinct age from users);
+} {100}
+
+# Test verifying that select distinct works for multiple columns, and across joins
+do_execsql_test subquery-count-distinct {
+    select count(1) from (
+        select distinct first_name, name 
+        from users u join products p 
+        where u.id < 100
+    );
+} {902}
+
+do_execsql_test subquery-count-all {
+    select count(1) from (
+        select first_name, name 
+        from users u join products p 
+        where u.id < 100
+    );
+} {1089}