What is the STRICT keyword used for in SQLite table definitions?

Adding STRICT to a CREATE TABLE statement opts that specific table out of SQLite's usual flexible type affinity behavior, instead enforcing that inserted values must actually match the column's declared type — much closer to how most other SQL databases behave by default.

CREATE TABLE person (
    id INTEGER PRIMARY KEY,
    age INTEGER
) STRICT;

INSERT INTO person (age) VALUES ('not a number');   -- fails: STRICT enforces type matching

Without STRICT, that same insert would silently succeed, storing the text value in the INTEGER-affinity column as discussed with type affinity. STRICT tables were added specifically to give developers who want more predictable, conventional type enforcement an explicit opt-in, without changing SQLite's default (flexible, dynamically-typed) behavior for tables that don't request it.

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