Question

我有两张桌子

 ID_USER | USERNAME
   1       Max
   2       Jean
   3       Carl
   4       Sophie

和

ID_MONEY | ID_USER | MONEY
  1           4      1000
  2           2      1500
  3           3      1250
  4           1      920

我想执行第二个表SQL并按用户名（按字母顺序）对结果进行排序，以获得此结果：

Carl have: 1250$
Jean have: 1500$
Max  have: 920$
Sophie have: 1000$

我应该执行什么类型的查询？我试过了，

SELECT * 
FROM $table_users 
WHERE id_user='$id_user' 
ORDER BY (SELECT username FROM $table_money WHERE id_user='$id_user') ASC

但不是预期的结果。

Answer 1

您需要INNER JOIN。这可以使用连接或WHERE子句来完成。

SELECT USERNAME, MONEY
FROM $table_users
JOIN $table_money USING (ID_USER)
ORDER BY USERNAME

或

SELECT USERNAME, MONEY
FROM $table_users, $table_money
WHERE $table_users.ID_USER = $table_money.ID_USER
ORDER BY USERNAME

Answer 2

我猜table_money可能会为同一个用户提供多个货币值，您可能需要总数。

SELECT table_users.ID_USER, table_users.USERNAME, SUM(table_money.MONEY)
FROM table_users  INNER JOIN table_money ON table_users.ID_USER = table_money.ID_USER
GROUP BY table_users.ID_USER, table_users.USERNAME
ORDER BY table_users.USERNAME

Answer 3

在这里，我使用连接函数来连接字符串。

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输出： -

一个SQL中的两个表，查询

3 个答案: