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Что означает NULL в SQL-выражениях
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NULL - это не ноль, это пустота, объясняет на практических примерах Ольга Киселева.
tg-me.com/sql_for_qa/367
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SQL для тестировщика Telegram | DID YOU KNOW?
Date: | SQL для тестировщика
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SQL для тестировщика from br