我正在尝试在查询中get max value
一列,但找不到任何解决方案。我的查询是
SELECT pz.id,
sz.Price + cr.AddedCost AS price
FROM piz pz, crust cr, size sz
WHERE
pz.SizeID = sz.id AND
pz.CrustID = tp.id
然后我收到一些记录,如下所示
ID price
-----------
1 95000.0
6 160000.0
10 150000.0
3 137500.0
5 122500.0
4 195000.0
2 195000.0
7 130000.0
8 205000.0
9 130000.0
11 205000.0
我想获得价格max value
的record
,它们是:
ID price
------------
8 205000.0
11 205000.0
我正在使用 Navicat 和 MySQL 服务器
更新:我确实尝试使用:
SELECT pz.id, MAX(sz.Price + cr.AddedCost) AS price ....
但它不起作用,因为返回的 id 是错误的
当你
这样做时会发生什么。
将所有旧样式逗号分隔的连接更改为内部连接,以提高可读性。
SELECT pz.id,
sz.Price + cr.AddedCost AS price
FROM piz pz
INNER JOIN crust cr
ON pz.CrustID = cr.id
INNER JOIN size sz
ON pz.SizeID = sz.id
WHERE sz.Price + cr.AddedCost = (SELECT sz.Price + cr.AddedCost AS price
FROM piz pz1
INNER JOIN crust cr1
ON pz1.CrustID = cr1.id
INNER JOIN size sz1
ON pz1.SizeID = sz1.id
ORDER BY price DESC limit 1 )
使用Max函数:)从中选择最大值(列) ...
从哪里选择 MAX(col)但请注意,此列必须是数字而不是字符串
试试这个:
SELECT pz.id,
sz.Price + cr.AddedCost AS price
FROM piz pz, crust cr, size sz,
(
select max(sz.Price + cr.AddedCost) as v
from crust cr, size sz
where pz.SizeID = sz.id
and pz.CrustID = tp.id
)t
WHERE
pz.SizeID = sz.id AND
pz.CrustID = tp.id AND
(sz.Price + cr.AddedCost) = t.v
试试这个:
SELECT pz.id,
sz.Price + cr.AddedCost AS price
FROM piz pz, crust cr, size sz
WHERE
pz.SizeID = sz.id AND
pz.CrustID = tp.id
HAVING
price = (SELECT max(sz.Price + cr.AddedCost) from crust cr, size sz)