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这个是用mid()函数 截取字符串 mysql> select count(*) as '数量',mid(time,1,7) as month from my_add where time between '2015-01-01 00:00:00' and '2016-01-01 00 ...
快速查看SQL Server 中各表的数据量以及占用空间大小。 ...
查询数据库中每张表的记录条数 ...
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select count(*) from table_name; ...