Question

我有一个MySQQL数据库表，我根据一些用户输入动态地使用PHP构建SQL语句。

SQL最终看起来像这样....

SELECT * 
FROM  `nam_order_items` 
WHERE item_status =  'Glass Bending - Andy'
OR item_status =  'Glass Bending - Bren'
OR item_status =  'Glass Bending - Gary'
OR item_status =  'Glass Bending - James'
OR item_status =  'Glass Bending - Oscar'
AND (
`backing_cut` =0
)

基本上，DB列item_status可以是其中任何一列，backing_cut列可以是0或1。

使用上面的SQL，它会返回与item_status值匹配的所有记录，而不管backing_cut值是什么。

它应该允许我根据backing_cut为0或1的值来过滤掉结果中的记录。

我做错了什么？

除了上面的SQL，我还试过....

SELECT * 
FROM  `nam_order_items` 
WHERE item_status =  'Glass Bending - Andy'
OR item_status =  'Glass Bending - Bren'
OR item_status =  'Glass Bending - Gary'
OR item_status =  'Glass Bending - James'
OR item_status =  'Glass Bending - Oscar'
AND `backing_cut` =0

和

SELECT * 
FROM  `nam_order_items` 
WHERE item_status =  'Glass Bending - Andy'
OR item_status =  'Glass Bending - Bren'
OR item_status =  'Glass Bending - Gary'
OR item_status =  'Glass Bending - James'
OR item_status =  'Glass Bending - Oscar'
(
    AND `backing_cut` =0
)

Answer 1

使用括号

SELECT * 
FROM  `nam_order_items` 
WHERE (item_status =  'Glass Bending - Andy'
OR item_status =  'Glass Bending - Bren'
OR item_status =  'Glass Bending - Gary'
OR item_status =  'Glass Bending - James'
OR item_status =  'Glass Bending - Oscar')
AND (`backing_cut` = 0 OR `backing_cut` = 1 OR `backing_bent` = 0 OR `backing_bent` = 1)

您也可以将数组中的值用作

SELECT * 
FROM  `nam_order_items` 
WHERE `item_status` IN  ('Glass Bending - Andy','Glass Bending - Bren','Glass Bending - Gary','Glass Bending - James','Glass Bending - Oscar')
AND (`backing_cut` = 0 OR `backing_cut` = 1 OR `backing_bent` = 0 OR `backing_bent` = 1)

然后您可以使用php构建您的数组，并执行以下操作：

$options = array('Glass Bending - Andy','Glass Bending - Bren','Glass Bending - Gary','Glass Bending - James','Glass Bending - Oscar');

$sql = "SELECT * FROM `nam_order_items` WHERE `item_status` IN ({implode(',', $options}) AND (`backing_cut` = 0 OR `backing_cut` = 1 OR `backing_bent` = 0 OR `backing_bent` = 1)";

编辑添加支持cut = 1或0

的选项

Answer 2

连词优先于分离，所以

SELECT * 
FROM  `nam_order_items` 
WHERE item_status =  'Glass Bending - Andy'
OR item_status =  'Glass Bending - Bren'
OR item_status =  'Glass Bending - Gary'
OR item_status =  'Glass Bending - James'
OR item_status =  'Glass Bending - Oscar'
AND `backing_cut` =0

和

SELECT * 
FROM  `nam_order_items` 
WHERE item_status =  'Glass Bending - Andy'
OR item_status =  'Glass Bending - Bren'
OR item_status =  'Glass Bending - Gary'
OR item_status =  'Glass Bending - James'
OR item_status =  'Glass Bending - Oscar'
(
    AND `backing_cut` =0
)

在语义上是相同的。您必须使用括号对析取进行分组，使其优先于连接：

SELECT * 
FROM  `nam_order_items` 
WHERE item_status =  ('Glass Bending - Andy'
OR item_status =  'Glass Bending - Bren'
OR item_status =  'Glass Bending - Gary'
OR item_status =  'Glass Bending - James'
OR item_status =  'Glass Bending - Oscar' )
AND `backing_cut` = 0

Answer 3

为了更容易理解为什么要按照您熟悉的术语考虑运营商。

OR和AND运算符优先级类似于+和*。

因此，如果您执行1 + 1 + 1 * 2或1 + 1 + 1 * (2)或1 + 1 + 1 (* 2)，则结果始终为4。 *始终是第一个执行的运算符。如果您希望结果为6，那么您需要(1 + 1 + 1) * 2。

具有多个OR条件和单个AND条件的MySQL查询

3 个答案: