标签:多表 price SELECT 错题 补题 model speed maker select
10-4 4-4 查询具有最高价格的机器的型号,机器包括PC、Laptop、Printer (10 分)
SELECT a.model
from (
SELECT price,model
from pc
UNION
SELECT price,model
from laptop
UNION
SELECT price,model
from printer
)as a
WHERE a.price =(
SELECT max(b.price)
FROM (
SELECT price,model
from pc
UNION
SELECT price,model
from laptop
UNION
SELECT price,model
from printer
)b
)
10-7 5-1 查询销售便携式电脑但不销售PC的厂商 (10 分)
SELECT maker
FROM product p,laptop l
WHERE p.model=l.model and maker not in(
SELECT maker
FROM product p,pc
WHERE p.model=pc.model
)
10-8 5-2 查询至少生产两种不同的计算机(PC或便携式电脑)且机器速度至少为133的厂商
select maker
from (
select maker,model
from product
where model in (
select model
from pc
where speed>=133
)
union
select maker,model
from product
where model in (
select model
from laptop
where speed>=133
)
) as a
group by maker
having count(maker)>=2
10-9 5-3 查询生产最高速度的计算机(PC或便携式电脑)厂商 (10 分)
select maker
from (
select model, maker
from product
where speed in (
select MAX(speed)
from
)
union
select model, maker
from product
where speed in (
select MAX(speed)
from laptop
union
select MAX(speed)
from pc
)
) as a
ORDER BY maker
标签:多表,price,SELECT,错题,补题,model,speed,maker,select 来源: https://blog.csdn.net/dylan_sjc/article/details/115493163
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