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Displaying posts with tag: count(col) (reset)

Mar

2018

Posted by mysql-云栖社区 on Thu 08 Mar 2018 07:02 UTC
Tags:

varchar, count(*), MySQL, read, 索引, 测试, count(1), count(col)

最近感觉大家都在讨论count的区别，那么我也写下吧：欢迎留言讨论1、表结构： dba_jingjing@3306>[rds_test]>CREATE TABLE `test_count` ( -> `c1` varchar(10) DEFAULT NULL, -> `c2...

【mysql】【测试】【索引】【read】【varchar】【Count(*)】【count(1)】 …

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