Question

我有这个更新查询，当我的地方有2个条件但是当我添加3个以上时它无效。谁能看到它并告诉我什么是错的。谢谢。

继承我的疑问：

$sSQLupdate = "UPDATE settings, holidaytype SET 
settings.companyName = '$companyname', 
settings.companyAddress = '$companyaddress', 
settings.companyContact = '$companycontact', 
settings.excessot1 = '$excessot1', 
settings.multiplierOT1 = '$multiplier1', 
settings.excessot2 = '$excessot2', 
settings.multiplierOT2 = '$multiplier2', 
settings.ndRangeFrom = '$ND_in',
settings.ndRangeTo = '$ND_out',
settings.multiplierNd = '$NDmul',
holidaytype.multiplier = '$regularmul',      *(mustbe in holidaytype.id = '1')
holidaytype.multiplier = '$specialmul',      *(mustbe in holidaytype.id = '2')
holidaytype.multiplier = '$doubleregmulmul', *(mustbe in holidaytype.id = '3')
holidaytype.multiplier = '$doublespecmul'    *(mustbe in holidaytype.id = '4')

WHERE settings.id = 1 AND holidaytype.id = '1' AND holidaytype.id = '2' AND holidaytype.id = '3' AND holidaytype.id = '4'";

Answer 1

试试这个：

WHERE settings.id = 1 AND holidaytype.id IN ('1','2','3','4')

要根据holidaytype.multiplier更新holidaytype.id条件，建议您使用CASE语句或单独查询。

Answer 2

因为所有这三个条件都不可能是真实的，即

WHERE settings.id = 1 AND holidaytype.id = '1' AND holidaytype.id = '2' AND holidaytype.id = '3' AND holidaytype.id = '4'";

如果holidaytype.id = '1'则不能'2' or '3' or '4'

您最好使用 IN

WHERE settings.id = 1 AND holidaytype.id IN ('1','2','3','4')

Answer 3

您需要使用OR代替AND AND，因为它们无法同时为真，其中一个必须为真。试试这个：

   WHERE settings.id = 1 
   AND (holidaytype.id = '1' OR holidaytype.id ='2' OR holidaytype.id ='3' OR holidaytype.id ='4')";

或与IN子句一起使用：

   WHERE settings.id = 1 AND holidaytype.id IN ('1','2','3','4')";

您的更新没有任何意义，请更新两个具有彼此条件的表格。要么单独更新每个表，要么使用连接表。

Answer 4

使用括号分隔布尔语句：

WHERE settings.id = 1 AND (holidaytype.id = '1' OR holidaytype.id = '2' OR holidaytype.id = '3' OR holidaytype.id = '4');

我怎样才能让我的where声明在这里工作？

4 个答案: