How INSERT and JOIN Actually Execute in SQLite

Hello, I'm Maneshwar. I'm working on git-lrc : a Git hook for Checking AI generated code. Yesterday we dissected individual opcodes like OpenRead , MakeRecord , Next , and Halt . Today we zoom out again and observe how those instructions assemble into full execution patterns. Instead of looking at single instructions, we now look at execution logic how the VM composes those tiny primitives to implement real SQL statements. Let’s begin with something simple. Insert Logic Assume we have a table: T1(c1 TEXT, c2 INTEGER) No indexes. No triggers. Just a plain table backed by a B+-tree. Now execute: INSERT INTO T1 VALUES ( 'Hello, World!' , 2000 ); On the surface, it feels like a single action. Internally, the VM executes a structured sequence of operations. First, a write transaction must begin. The VM issues a Transaction opcode with write intent. No data changes happen before this step. Second, the VM executes VerifyCookie . This ensures the schema version stored in the database matches w