php - 使用内连接获取单个值

Question

我有两个表 calldetails 和 calltype

通话详细信息表

id calltype isactive
1   1       1
2   1       1
3   1       1

调用类型表

id name             isactive
1  mobile internet   1

预期结果

id name             isactive
1  mobile internet   1

但我得到的结果低于

id name             isactive
1  mobile internet   1
1  mobile internet   1
1  mobile internet   1

我使用了以下查询

SELECT ct.`name` , ct.`id`
FROM calltype AS ct
INNER JOIN calldetails AS cd ON cd.`isactive` =1
WHERE ct.`isactive` =1
AND ct.`id` = cd.`calltype`
LIMIT 0 , 30

如何使用内连接获取单个值。

Answer 1

尝试使用DISTINCT

SELECT DISTINCT ct.`name` , ct.`id`
FROM calltype AS ct
INNER JOIN calldetails AS cd ON cd.`isactive` =1
WHERE ct.`isactive` =1
AND ct.`id` = cd.`calltype`
LIMIT 0 , 30