Executed the test and got this result: 2/0/563136D280B8: end processing '-- SELECT (2/563136D280B8) selFlags=0x4400c4 nSelectRow=0 '-- result-set '-- AS END '-- CASE |-- 1 '-- LIST |-- EQ fg.af=40000000.n DDL | |-- NEW(5) | '-- 2 '-- CASE |-- 1 '-- LIST |-- OR fg.af=40000000.n DDL | |-- NOT fg.af=40000000.n DDL | | '-- IN flags=0x40000000 | | |-- OLD(5) | | '-- LIST | | |-- 1 | | '-- 128 | '-- AND fg.af=40000000.n DDL | |-- NOTNULL fg.af=40000000.n DDL | | '-- OLD(6) | '-- NOT fg.af=40000000.n DDL | '-- EQ fg.af=40000000.n DDL | |-- OLD(5) | '-- 4 |-- RAISE abort('Error: someone goofed') |-- NE fg.af=40200000.n DDL | |-- subquery-expr flags=0x42200800 | | '-- SELECT (1/563136D2AFF8) selFlags=0x40c4 nSelectRow=0 | | |-- result-set | | | '-- {0:5} pTab=563136D21208 fg.af=40800000.n DDL | | |-- FROM | | | '-- {0:*} C1 tab='C1' nCol=8 ptr=563136D21208 used=22 DDL | | |-- WHERE | | | '-- EQ fg.af=40000000.n DDL | | | |-- {0:1} pTab=563136D21208 fg.af=40800000.n DDL | | | '-- NEW(0) | | '-- LIMIT | | '-- 1 | '-- 4 '-- RAISE abort('Error you are not allowed to change the status') *** Optimizer Start *** (wctrlFlags: 0x1004) ---- Solution nRow=1 0 0.01.00 C1._2 1 f 01241 N 1 cost 0,39,1 *** Optimizer Finished *** ONEPASS_SINGLE cursors: 3 4 Error: near line 6: no such column: C1_QTY_PRODUCED Note that the .selecttrace crashes and the .wheretrace shows and error. What?! Excuse me! The table C1 has a column C1_QTY_PRODUCED. Here is the table: CREATE TABLE IF NOT EXISTS C1 ( C1_PRODUCTION_ORDER VARCHAR(20), C1_INDEX INTEGER, C1_QTY_TO_PRODUCE NUMBER DEFAULT 0, C1_QTY_PRODUCED NUMBER DEFAULT 0, C1_PRODUCTION_STATUS NUMBER CHECK (C1_PRODUCTION_STATUS IN (1, 2, 4, 128)), C1_STATUS NUMBER CHECK (C1_STATUS IN (1, 2, 4, 8)), C1_DTS_CREATED TEXT NOT NULL DEFAULT (DATETIME('NOW', 'UTC')), C1_DTS_UPDATED TEXT NOT NULL DEFAULT (DATETIME('NOW', 'UTC')), CONSTRAINT C1_PK PRIMARY KEY ( C1_PRODUCTION_ORDER ) ON CONFLICT ROLLBACK, CONSTRAINT C1_INDEX_FK FOREIGN KEY ( C1_INDEX ) REFERENCES A1 ( A1_INDEX ), UNIQUE ( C1_INDEX ) ); Am I overlooking something?