Question

我正在尝试完成以下sql语句，但我在响应中得到一个重复的id。

SELECT ci.customer_id,
       ci.first_name,
       ci.user_gender,
       ci.customer_status,
       fr.relation
FROM   customerinfo ci
       INNER JOIN familyrelation fr
               ON ( fr.personid_two = ci.customer_id )
WHERE  ci.customer_id IN (SELECT personid_two
                          FROM   familyrelation
                          WHERE  personid_one = 17)
       AND ci.csp_user_id = 5;

当我运行此查询时，我正在获取正确的结果，但是一个 customer_id 正在重复。任何帮助/建议都非常感谢。

Answer 1

如果您的数据看起来像这样

drop table if exists ci,fr;
create table ci(customer_id int, name varchar(3),csp_user_id int);
create table fr(personid_one int,personid_two int,relation varchar(10));

insert into ci values (1,'aaa',5),(2,'bbb',5);
insert into fr values (17,1,'mother'),(17,1,'father'),(17,2,'niece');

然后您的查询选择我期望的行

SELECT ci.customer_id,
       ci.name,
       fr.relation
FROM   ci
       INNER JOIN  fr
               ON ( fr.personid_two = ci.customer_id )
WHERE  ci.customer_id IN (SELECT personid_two
                          FROM   fr
                          WHERE  personid_one = 17)
AND ci.csp_user_id = 5;  

 +-------------+------+----------+
| customer_id | name | relation |
+-------------+------+----------+
|           1 | aaa  | mother   |
|           1 | aaa  | father   |
|           2 | bbb  | niece    |
+-------------+------+----------+
3 rows in set (0.00 sec)

避免响应中的重复ID

1 个答案: