IF语句中的MySQL WHERE

Question

我正在尝试创建3个表的视图。有一条线正在弄乱一切，我无法做到正确。它在下面的“IF”声明中。我知道我不能在if语句中使用WHERE，但这正是我想要实现的。

表'c'（qms_dpus表）是一个存储每个作业的错误的表。我想做的就是说

“对于表'a'中的每个作业，检查表'c'以查看JOBNUM列是否匹配且IS_COMPLETE列是否为0.如果是，则在此新列{{1}中加1如果为false，则在“

列中添加0

OPEN_DPUS

当我删除I​​F语句（以及对表'c'的引用）时，代码工作得很好，除了列CREATE OR REPLACE VIEW `view_qms_linea` AS SELECT a.ID AS `ID`, a.JID AS `JID`, b.HPL AS `HPL`, b.LINE AS `LINE`, a.PAREA AS `PRODAREA`, a.JOBNUM AS `JOBNUM`, b.MODELNUMBER AS `MODELNUMBER`, b.CUSTOMER AS `CUSTOMER`, b.PM_AE AS `PM_AE`, b.PM_PE AS `PM_PE`, b.PM_DE AS `PM_DE`, b.PM_EE AS `PM_EE`, b.PM_ED AS `PM_ED`, b.PM_CE AS `PM_CE`, IF(c.IS_COMPLETE=0 WHERE c.JOBNUM LIKE a.JOBNUM, 1, 0) AS `OPEN_DPUS` FROM `gen_jobs_in_production` a, `gen_jobs_table` b, `qms_dpus` c WHERE a.JOBNUM LIKE b.WO AND b.LINE = 1 AND a.PAREA != 4 AND a.PAREA <= 7; 之外我还需要我，但是如果我用这个替换IF语句：

OPEN_DPUS

我的视图为我提供了所有数据，但不是12条记录（当前），它重复每条记录12次并无限重复该模式。

我很乐意展示我的桌面结构，但我有很多专栏，只会让这更令人困惑......

非常感谢任何帮助！

Answer 1

您的查询缺少join条件。因此，它会在您的查询中返回3个表的交叉连接结果。请尝试以下查询。

CREATE OR REPLACE VIEW `view_qms_linea` AS SELECT 
 a.ID AS `ID`,
 a.JID AS `JID`,
 b.HPL AS `HPL`,
 b.LINE AS `LINE`,
 a.PAREA AS `PRODAREA`,
 a.JOBNUM AS `JOBNUM`,
 b.MODELNUMBER AS `MODELNUMBER`,
 b.CUSTOMER AS `CUSTOMER`,
 b.PM_AE AS `PM_AE`,
 b.PM_PE AS `PM_PE`,
 b.PM_DE AS `PM_DE`,
 b.PM_EE AS `PM_EE`,
 b.PM_ED AS `PM_ED`,
 b.PM_CE AS `PM_CE`,
--change from here
 IF(c.IS_COMPLETE = 0, 1, 0) AS `OPEN_DPUS`
 FROM `gen_jobs_in_production` a 
JOIN `gen_jobs_table` b ON  a.JOBNUM = b.WO
JOIN `qms_dpus` c ON c.jobnum = a.jobnum 
WHERE b.LINE = 1
AND a.PAREA != 4
AND a.PAREA <= 7;