SQL查询条件问题

Question

我在这里有此查询：

SELECT formam.*, SMS_MONTIME1.IDTICKET, SMS_MONTIME1.MBYLLUR,SMS_MONTIME1.time_added
FROM formam 
LEFT JOIN SMS_MONTIME1 ON formam.ID = SMS_MONTIME1.IDTICKET WHERE SMS_MONTIME1.IDTICKET =''
    or SMS_MONTIME1.IDTICKET is null
    AND dyqani_pergjegjes=$dyqanip
ORDER BY formam.data_fillim DESC

问题是，它工作正常，但是当我添加条件AND dyqani_pergjegjes=$dyqanip它不再起作用，尽管我没有任何错误，但我没有得到所需的结果。

有人帮忙

Answer 1

这样可以很好地解决问题：

SELECT formam.*, SMS_MONTIME1.IDTICKET, SMS_MONTIME1.MBYLLUR,SMS_MONTIME1.time_added
FROM formam 
LEFT JOIN SMS_MONTIME1 ON formam.ID = SMS_MONTIME1.IDTICKET WHERE SMS_MONTIME1.IDTICKET =''
    OR (SMS_MONTIME1.IDTICKET is null
    AND dyqani_pergjegjes=$dyqanip)
ORDER BY formam.data_fillim DESC

我改变的是，我将方括号括起来

SMS_MONTIME1.IDTICKET为空且dyqani_pergjegjes = $ dyqanip

确保OR和AND的正确优先级。