MySQL -优化OR语句

Question

我想使用OR子句搜索3列。我知道我遗漏了一些东西，但我一直收到mysql错误。

这是我到目前为止所知道的：

SELECT customerid,companyname,firstname,lastname
FROM `tbl_customers` 
WHERE customeronoff = 1 
AND customerrecordtype = 'A' 
AND (companyname LIKE '$query%') OR (lastname LIKE '$query%') OR (firstname LIKE '$query%')   
ORDER BY lastname ASC

我一定是把手术室放错了。有人能治好我吗？

Answer 1

使用paranethesis对您的OR staements进行分组：

AND (
     (companyname LIKE '$query%') 
  OR (lastname LIKE '$query%') 
  OR (firstname LIKE '$query%')  
)

Answer 2

你遗漏了两个括号：

SELECT customerid,companyname,firstname,lastname
FROM `tbl_customers` 
WHERE customeronoff = 1 
AND customerrecordtype = 'A' 
AND **(**(companyname LIKE '$query%') OR (lastname LIKE '$query%') OR (firstname LIKE '$query%')**)**
ORDER BY lastname ASC