MySQL执行where子句后选择

此查询在where子句中提供未知列company时出错。我发现where子句首先运行，select然后运行。这可能是这里的错误。但我不知道如何纠正这一点，以便让公司进入结果集

SELECT trnsdriverid,
       name,
       (SELECT transcompany.name
        FROM   transcompany,
               transcompdriver
        WHERE  transcompany.trnscompid = transcompdriver.trnscompid) AS 'company',
       address,
       dob,
       license,
       telephone
FROM   transcompdriver
WHERE  ? LIKE 'All'
        OR name LIKE '%"+keyword+"%'
        OR company LIKE '%"+keyword+"%'
        OR trnsdriverid LIKE '%"+keyword+"%' 

---

不能在where语句中引用列别名。您应该重写此查询以使用联接，然后对实际的TransCompany.name列进行筛选，例如：

select 
     d.trnsDriverID
    ,d.name
    ,c.name as [Company]
    ,d.address
    ,d.dob
    ,d.license
    ,d.telephone 
from 
    TransCompDriver d
join
    TransCompany c
    on
    c.trnscompid = d.trnscompid
where 
    ? = 'All' 
    or 
    d.name like '%" + keyword + "%' 
    or 
    c.name like '%" + keyword + "%' 
    or 
    d.trnsDriverID like '%" + keyword + "%'

---

另外，不要像使用简单的相等运算符那样使用

。我将上面的查询更改为使用
='All'
您真的应该使用连接而不是子选择来执行此操作。我建议：

SELECT
    d.trnsDriverID,
    d.name,
    c.name AS `company`,
    d.address,
    d.dob,
    d.license,
    d.telephone
FROM
    TransCompDriver AS d
    INNER JOIN TransCompany AS c
        ON d.trnsCompID = c.trnsCompID
WHERE
    ? like 'All'
    OR d.name LIKE '%"+keyword+"%'
    OR `company` LIKE '%"+keyword+"%'
    OR d.trnsDriverID LIKE '%"+keyword+"%'

提取列“company”的子查询没有匹配的行数，请改为尝试join语句

select trnsDriverID, name, t1.name AS company, address, dob, license, telephone    
from TransCompDriver JOIN (select trnsDriverID, name, 
(select TransCompany.name from TransCompany LEFT JOIN TransCompDriver   
ON TransCompany.trnsCompID=TransCompDriver.trnsCompID) AS t1   
where ? like 'All' or name like '%"+keyword+"%'   or company like '%"+keyword+"%' 
or trnsDriverID like '%"+keyword+"%'

这是因为您将嵌套select的结果别名为“company”——该列实际上并不存在。不能在where语句中引用列别名。您应该重写此查询以使用联接，然后对实际的
TransCompany.name
列进行筛选。该公司列的行数与另一列的行数不同columns@Cory谢谢你的回复。我将尝试使用join。@user2033382:我回答了一个应该有效的查询。@Cory。是的，很好用。又来了一批。不幸的是，由于缺乏声誉，还不能投票。谢谢你的回复。我在上面得到了类似的答案。两个答案都很好。