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https://bravikov.wordpress.com/2013/10/28/%d0%ba%d1%80%d0%b0%d1%82%d0%ba%d0%be%d0%b5-%d0%be%d0%bf%d0%b8%d1%81%d0%b0%d0%bd%d0%b8%d0%b5-%d1%81%d1%82%d1%80%d0%be%d0%ba%d0%be%d0%b2%d1%8b%d1%85-%d1%84%d1%83%d0%bd%d0%ba%d1%86%d0%b8%d0%b9-t-sql/
Краткое описание строковых функций Transact-SQL