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In sqlite, iif() looks like: sqlite> create table iiftest(a int, b int, c int); sqlite> explain select iif(a,b,c) from iiftest; addr opcode p1 p2 p3 p4 p5 comment ---- ------------- ---- ---- ---- ------------- -- ------------- 0 Init 0 11 0 0 Start at 11 1 OpenRead 0 2 0 3 0 root=2 iDb=0; iiftest 2 Rewind 0 10 0 0 3 Column 0 0 2 0 r[2]= cursor 0 column 0 4 IfNot 2 7 1 0 5 Column 0 1 1 0 r[1]= cursor 0 column 1 6 Goto 0 8 0 0 7 Column 0 2 1 0 r[1]= cursor 0 column 2 8 ResultRow 1 1 0 0 output=r[1] 9 Next 0 3 0 1 10 Halt 0 0 0 0 11 Transaction 0 0 1 0 1 usesStmtJournal=0 12 Goto 0 1 0 0 And with this change, in limbo it looks like: addr opcode p1 p2 p3 p4 p5 comment ---- ----------------- ---- ---- ---- ------------- -- ------- 0 Init 0 14 0 0 Start at 14 1 OpenReadAsync 0 2 0 0 table=iiftest, root=2 2 OpenReadAwait 0 0 0 0 3 RewindAsync 0 0 0 0 4 RewindAwait 0 13 0 0 Rewind table iiftest 5 Column 0 0 2 0 r[2]=iiftest.a 6 IfNot 2 9 1 0 if !r[2] goto 9 7 Column 0 1 1 0 r[1]=iiftest.b 8 Goto 0 10 0 0 9 Column 0 2 1 0 r[1]=iiftest.c 10 ResultRow 1 1 0 0 output=r[1] 11 NextAsync 0 0 0 0 12 NextAwait 0 5 0 0 13 Halt 0 0 0 0 14 Transaction 0 0 0 0 15 Goto 0 1 0 0