[英]SQL Data type mismatch in criteria expression MS Access
我有个问题。
当我尝试运行此查询时:
SELECT Artiesten.ID AS txtArtiestId,
NULL AS txtAlbumId,
NULL AS txtNummerId,
Artiestnaam AS Artiesten,
NULL AS Albums,
NULL As Nummers
FROM Artiesten
WHERE Artiesten.Artiestnaam LIKE '*On*'
UNION ALL
SELECT
Artiesten.ID AS txtArtiestId,
Albums.ID AS txtAlbumId,
NULL AS txtNummerId,
Artiesten.Artiestnaam AS
Artiesten, Naam AS Albums,
NULL As Nummers
FROM Albums
INNER JOIN Artiesten ON Albums.ArtiestId = Artiesten.ID
WHERE albums.naam LIKE '*On*'
UNION ALL
SELECT
Artiesten.ID AS txtArtiestId,
Albums.ID AS txtAlbumId,
Nummers.ID AS txtNummerId,
Artiesten.Artiestnaam AS Artiesten,
Albums.Naam AS Albums,
Nummers.Naam AS Nummers
FROM (Nummers INNER JOIN Albums ON Nummers.AlbumId = Albums.ID)
INNER JOIN Artiesten ON Albums.ArtiestId = Artiesten.ID
WHERE Nummers.Naam LIKE '*On*'
它说:
“条件表达式中的数据类型不匹配”
现在我已经知道它必须与第一个和最后一个查询有关。 这两个一起导致了错误。
我究竟做错了什么?
您可以通过在第一个查询中为NULL
提供适当的类型来解决此问题:
SELECT Artiesten.ID AS txtArtiestId,
int(NULL) AS txtAlbumId,
int(NULL) AS txtNummerId,
Artiestnaam AS Artiesten,
str(NULL) AS Albums,
str(NULL) As Nummers
FROM Artiesten
WHERE Artiesten.Artiestnaam LIKE '*On*'
实际上,我不确定正确的类型是什么。 我只是猜测。
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