我有以下查询：
SELECT SUM( cost )
FROM (
SELECT s.cost
FROM sandwiches AS s
WHERE s.name = "Cheese Steak"
)
UNION (
SELECT p.cost
FROM pizza AS p
WHERE TYPE = "Plain"
AND SIZE = "L"
)
这给了我一个错误：
#1248 - 每个派生表必须有自己的别名
您需要为临时表添加别名
SELECT SUM( cost )
FROM
(
(
SELECT s.cost
FROM sandwiches AS s
WHERE s.name = "Cheese Steak"
) AS T1
UNION
(
SELECT p.cost
FROM pizza AS p
WHERE TYPE = "Plain"
AND SIZE = "L"
) AS T2
) AS T
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