Question

我的问题：我有3个表，user，debit和user_list。我需要在一个查询中（因为我在android上使用了Cursor）并且最好不要使用rawQuery来获取user.name以及链接到该用户的所有借记的总和，状态= 1。

例如：

User                      Debit                          User_List

id   |  name              user_id    |   value        user_id    |    status

1    | John               1          | 10.23           1                1
2    | Marie              1          | 22              2                1
                          2          | 2333

当状态等于1时，它应返回类似下面的内容：

name     value

John     32.23
Marie    2333

到目前为止我做了什么：

SELECT (select SUM(debit_value) from debits where debit_status = 0) AS user_balance, user_name AS user_name, status, users.user_id AS user_id, _id FROM users INNER JOIN users_listview ON users.user_id = users_listview.user_id WHERE (status = ?) GROUP BY users._user_id

谢谢！

Answer 1

使用以下查询

select User.name, sum(Value) from User inner join Debit
on User.id=Debit.userid
Group by User.name

Answer 2

试试这个，

SELECT U.NAME,SUM(COALESCE(D.VALUE,0)) AS TOTAL_VALUE FROM USER U LEFT OUTER JOIN  DEBIT D ON U.ID=D.USER_ID GROUP BY U.NAME

Answer 3

我的最后一个问题：

SELECT SUM(debit_value) AS user_balance, user_name AS user_name, status, users.user_id AS user_id, users.user_id AS _id FROM users INNER JOIN users_listview ON users.user_id = users_listview.user_id INNER JOIN debits ON users.user_id = debit_to WHERE (status = ?) GROUP BY debit_to

谢谢大家！

汇总不同的行内连接sqlite android

3 个答案: