mysql - 别名导致 where 子句出错 - MySQL

Question

我的 SQL 代码:

SELECT (
           SELECT COUNT(1)
           FROM   FAVORI_DUALAR
           WHERE  DuaID       = D.DuaID
                  AND PID     = 'L3FNCPEVME36'
       )       AS Eklimi,
       (
           SELECT COUNT(1)
           FROM   EDILEN_DUALAR
           WHERE  DuaID       = D.DuaID
                  AND PID     = 'L3FNCPEVME36'
       )       AS Okudum,
       D.Tarih,
       D.DuaID,
       D.DuaBaslik,
       D.DuaTuru,
       D.DuaSayisiSiniri,
       D.DuaIcerik,
       D.DuaMeal,
       D.DuaArapca,
       D.PID,
       (
           SELECT COUNT(1)
           FROM   EDILEN_DUALAR
           WHERE  DuaID = D.DuaID
       )       AS Okundu
FROM   DUALAR     D
WHERE  D.Aktif = '1'
       AND (D.DuaTuru = 2 OR D.DuaTuru = 1 AND Okudum = 0)
ORDER BY
       D.Tarih DESC 
       LIMIT 9

Error : #1054 - Unknown column 'Okudum' in 'where clause'

我写的

SELECT COUNT(1)
FROM   EDILEN_DUALAR
WHERE  DuaID       = D.DuaID
       AND PID     = 'L3FNCPEVME36') AS Okudum

但我仍然在查询中收到错误。

Answer 1

您的 Okudum 字段是查询中的计算字段。这个不能直接引用(只能在ORDER BY中)。

因此您可以在 where 子句中使用:

WHERE ... AND (SELECT COUNT(1) FROM   EDILEN_DUALAR WHERE DuaID = D.DuaID AND PID = 'L3FNCPEVME36') = 0

或者你可以创建一个子查询: 使用 EDILEN_DUALAR 作为子查询进行联接。

SELECT (
           SELECT COUNT(1)
           FROM   FAVORI_DUALAR
           WHERE  DuaID       = D.DuaID
                  AND PID     = 'L3FNCPEVME36'
       )       AS Eklimi,
       ED.Okudum,
       D.Tarih,
       D.DuaID,
       D.DuaBaslik,
       D.DuaTuru,
       D.DuaSayisiSiniri,
       D.DuaIcerik,
       D.DuaMeal,
       D.DuaArapca,
       D.PID,
       (
           SELECT COUNT(1)
           FROM   EDILEN_DUALAR
           WHERE  DuaID = D.DuaID
       )       AS Okundu
, D.Aktif
FROM   DUALAR D LEFT JOIN
    (SELECT DuaID, COUNT(1) AS Okudum
           FROM   EDILEN_DUALAR
           WHERE  PID     = 'L3FNCPEVME36'
                  GROUP BY DuaID       ) ED

ON ED.DuaID = D.DuaID
WHERE   D.Aktif = '1'
       AND (D.DuaTuru = 2 OR D.DuaTuru = 1 AND (ED.Okudum IS NULL OR ED.Okudum = 0))
ORDER BY
       D.Tarih DESC