SQL: Part II
•Still complicates schema and queries •How to get all information about users in a table? •Natural join doesn’t work! 6. SQL’s solution •A special value NULL •For every domain •Special rules for dealing with NULL’s •Example: User (uid, name, age, pop) • 7. Three-valued logic •Comparing a NULL with another value (including another NULL) using , , etc., the result is NULL ... ................
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