MySQL 5.5.16 を使用しています
次のクエリがあります。これは、それだけで問題なく機能します。
SELECT DISTINCT i.id,
CASE WHEN e.date > '2012-10-16'
THEN e.date
ELSE '9999-99-99'
END AS date,
CASE WHEN e.date > '2012-10-16'
THEN time
ELSE '99-99-99'
END AS time
FROM items AS i
LEFT JOIN expiration AS e ON ( e.item_id = i.id )
WHERE (
(
data >= '2012-10-16'
AND e.valid=1
)
OR i.never_expires=1
)
AND i.valid=1
ORDER BY date ASC , time ASC
LIMIT 0 , 10
ただし、それをより大きなクエリに含めると、エラーが発生しますColumn 'date' in where clause is ambiguous
。上記のクエリが 内にある例を次に示しますJOIN
。
SELECT i.id, i.title, i.never_expires,
CASE WHEN e.date> '2012-10-16'
THEN e.date
ELSE '9999-99-99'
END AS date,
CASE WHEN e.date > '2012-10-16'
THEN e.time
ELSE '99-99-99'
END AS time, i.item_price AS price
FROM items AS i
LEFT JOIN expiration AS e ON ( e.item_id = i.id )
JOIN (
SELECT DISTINCT i.id,
CASE WHEN e.date > '2012-10-16'
THEN e.date
ELSE '9999-99-99'
END AS date,
CASE WHEN e.date > '2012-10-16'
THEN time
ELSE '99-99-99'
END AS time
FROM items AS i
LEFT JOIN expiration AS e ON ( e.item_id = i.id )
WHERE (
(
data>= '2012-10-16'
AND e.valid=1
)
OR i.never_expires=1
)
AND i.valid=1
ORDER BY date ASC , time ASC
LIMIT 0 , 10
) AS ilist ON (i.id=ilist.id)
WHERE (
(
date >= '2012-10-16'
AND e.valid=1
)
OR i.never_expires=1
)
AND i.valid=1
ORDER BY dateASC , time ASC
date
なぜそれが曖昧であると主張しているのですか?
PS内部クエリdate
の一部を に置き換えてみましたが、別のエラーがスローされるだけです...AS date
inner_date
Unknown column 'inner_date' in 'where clause'