SQL语句,给自己的记录
摘要:1.group by 和求和函数的使用select className,SUM(num) as sumNum FROM test GROUP BY className2.更新一个字段的所有值update table set 列明=1
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posted @ 2015-10-29 11:17
posted @ 2015-10-29 11:17
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posted @ 2015-10-09 14:29