SQLite’s Flexible Typing: Storage Types and Column Affinity

Hello, I'm Maneshwar. I'm working on git-lrc : a Git hook for Checking AI generated code. In the previous post, we discussed datatype management inside SQLite’s Virtual Machine (VM) and how the VM is responsible for assigning storage types and performing conversions. Today we take a deeper look at two key concepts that make SQLite unique among database systems: Storage type determination Column affinity determination Together, these explain why SQLite is often described as “typeless” and how it still manages to remain compatible with traditional SQL databases. Storage Type Determination SQLite is frequently described as a typeless database engine . This means it does not enforce strict domain constraints on table columns. In most cases, any type of value can be stored in any column , regardless of the column’s declared SQL type. There is one notable exception: the INTEGER PRIMARY KEY column (the rowid ). This column can only store integer values. If the VM encounters a value that canno