一条SQL语句
摘要:一条SQL语句左直拳如何写好SQL语句是一门很高深的学问,也有许多东西要学。今天因为工作的关系,需要用SQL语句进行统计,求一个平均数,发现可以这样写:SELECT (SELECT COUNT(1) AS stakeout FROM [表名A])/(SELECT COUNT(1) AS [user]...
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posted @ 2006-09-29 11:28
posted @ 2006-09-29 11:28
posted @ 2006-09-21 22:32
posted @ 2006-09-20 00:25