MySQL查询无法与其他数据库一起使用

Question

我有这个查询工作正常：

SELECT c.id, c.name
FROM job j
LEFT JOIN portfolio_job_category pjc ON pjc.job_id = j.id
LEFT JOIN category c ON c.id = pjc.category_id
WHERE j.end_date >= DATE( NOW( ) ) 
AND pjc.portfolio_id =3
GROUP BY c.id
ORDER BY  `c`.`id` ASC 
LIMIT 0 , 30

但是当我在下面查询时它不起作用并返回空行：

SELECT c.id, c.name
FROM commstratjobs.job j
LEFT JOIN commstratjobs.portfolio_job_category pjc ON pjc.job_id = j.id
LEFT JOIN commstratjobs.category c ON c.id = pjc.category_id
WHERE j.end_date >= DATE( NOW( ) ) 
AND pjc.portfolio_id =3
GROUP BY c.id
ORDER BY c.name;
LIMIT 0 , 30

有原因吗？

我唯一做的就是在表格前添加数据库...

Answer 1

你是否尝试将数据库分开;用这个符号表：`

即

commstratjobs。job

所以你的查询将是这样的

SELECT c.id, c.name
FROM `commstratjobs`.`job j`
LEFT JOIN `commstratjobs`.`portfolio_job_category` pjc ON pjc.job_id = j.id
LEFT JOIN `commstratjobs`.`category` c ON c.id = pjc.category_id
WHERE j.end_date >= DATE( NOW( ) ) 
AND pjc.portfolio_id =3
GROUP BY c.id
ORDER BY c.name;
LIMIT 0 , 30