Question

下表包含每个都有invoiceID的付款交易。我正在尝试编写一个查询来列出与其关联的多个交易的invoiceID。

    mysql> describe tblaccounts;
+-------------+---------------+------+-----+---------+----------------+
| Field       | Type          | Null | Key | Default | Extra          |
+-------------+---------------+------+-----+---------+----------------+
| id          | int(10)       | NO   | PRI | NULL    | auto_increment |
| userid      | int(10)       | NO   | MUL | NULL    |                |
| date        | datetime      | YES  | MUL | NULL    |                |
| description | text          | NO   |     | NULL    |                |
| amount      | decimal(10,2) | NO   |     | 0.00    |                |
| transid     | text          | NO   | MUL | NULL    |                |
| invoiceid   | int(10)       | NO   | MUL | 0       |                |
+-------------+---------------+------+-----+---------+----------------+

从我所读过的内容中我应该使用＆＃39; GROUP BY＆＃39;并且＆＃39; HAVING＆＃39;但我不明白如何使用它们。

Answer 1

SELECT invoiceid
FROM tblaccounts
GROUP BY invoiceid HAVING COUNT(*)>1

你可以像这样使用。第一组按发票ID。现在我们有了具有相同invoiceid的组。然后，我们使用 HAVING 关键字选择计数多于一的组。有关详情，请点击此处：http://www.w3schools.com/sql/sql_having.asp和此处：http://www.w3schools.com/sql/sql_groupby.asp

Answer 2

SELECT invoiceid FROM tblaccounts GROUP BY invoiceid HAVING COUNT(*) > 1

查询具有多个与之关联的事务的发票

2 个答案: