MySQL的count(*), count(1), count(col_name)的区别
本文来自于:
https://dev.mysql.com/doc/refman/5.6/en/group-by-functions.html#function_count
https://dev.mysql.com/doc/refman/5.7/en/group-by-functions.html#function_count
https://dev.mysql.com/doc/refman...
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2020-04-27 11:33:41 ·
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