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10 строки
301 B
Plaintext
10 строки
301 B
Plaintext
https://edu.postgrespro.ru/sqlprimer/sqlprimer-2019-msu-06.pdf
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! p18
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create unique index <index-name> on <table-name> (col1, col2, ...);
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! nulls are accepted at unique indices
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2024
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https://habr.com/ru/articles/871546/
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! each field with unique-constraint gets unique idx auto-created !!!
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