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Database / SQLite Interview questions

What is the difference between CHAR, VARCHAR, and TEXT in SQLite?

Functionally, all three are treated identically in SQLite — whatever length or width you declare (CHAR(10), VARCHAR(255)) is completely ignored for storage purposes; SQLite stores the string exactly as given, taking only as much space as the actual text requires, since it uses dynamic typing rather than fixed-width storage.

CREATE TABLE t (
    a CHAR(10),
    b VARCHAR(255),
    c TEXT
);
INSERT INTO t VALUES ('hi', 'this text is way longer than expected', 'anything');
-- all three succeed with no truncation or padding; SQLite doesn't enforce the declared length

All three simply map to the TEXT storage class and affinity underneath. The length/width number in CHAR(10) or VARCHAR(255) is accepted syntactically (for compatibility with SQL written for other databases) but has zero effect on how SQLite actually stores or validates the value.

Does SQLite enforce the length specified in VARCHAR(255)?
What storage class do CHAR, VARCHAR, and TEXT all map to in SQLite?

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