mysql怎么写最大值 mysql最大值,最小值,总和查询与计数查询

mysql 插入最大值用自增字段!
createtablerel1(
idINTNOTNULLAUTO_INCREMENTPRIMARYKEY,
yzbmvarchar(50)null,
namevarchar(50)null,
managervarchar(50)null
);
mysql求字段最大值和最小值select max(字段名) from tableName limit 0,1 最大
select min(字段名) from tableName limit 0,1 最小
select * from tableName order by 字段名 DESC limit 0,1 最大
select * from tableName order by 字段名 ASC limit 0,1最小
教您如何实现MySQL查询最大值字段麻烦告诉我MySQL查询最大值的方法并不十分复杂源码天空 , 下面就为您介绍MySQL查询最大值的方法,如果您遇到过MySQL查询最大值字段的问题,不妨一看 。select a.*, b.count from ( select * from message where to_uid=2026 and is_del2 and from_uid0 order by mid desc ) as a join ( select reply_id,count(*) as count from message where reply_id0 group by reply_id ) as b on (a.reply_id=b.reply_id) group by a.reply_id order by a.mid desc
mysql分组求和求最大值T是表,G是组,V是值:
分组、求和、求最大值:select G,MAX(SUM(V)) V1 from T group by G;
求比值:
select T.G,SUM(T.V)/A.V1
from T,
(select G,MAX(SUM(V)) V1 from T group by G) A
where T.G=A.G
group by T.G;
试试看,我没测试 。
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