日期:2014-05-18 浏览次数:20498 次
select model
from
(
(select model,price from PC)
UNION
(select model,price from Laptop)
UNION
(select model,price from Printer)
)M
where
(
M.price>=ALL
(
select price from
(
(select price from PC)
UNION
(select price from Laptop)
UNION
(select price from Printer)
)R
)
)
select model
from
(
(select model,price from PC)
UNION
(select model,price from Laptop)
UNION
(select model,price from Printer)
)M
where
(
ALL
(
select price from
(
(select price from PC)
UNION
(select price from Laptop)
UNION
(select price from Printer)
)R
)<=M.price
)
--这是一种语法,就像datepart(day,getdate())一样,你不可以把它放错位置
scalar_expression { = | < > | ! = | > | > = | ! > | < | < = | ! < }
{ ALL | SOME | ANY } ( subquery )