[英]How can I distinctively count values I recieve from a union query?
我有这个查询:
SELECT Pedido1 from mydb.atendimentos
UNION ALL
SELECT Pedido2 from mydb.atendimentos
order by Pedido1 ASC
这使我得到了以下结果: 执行查询时得到的内容现在要传递的内容是:
Teste -> 3
Teste2 -> 1
有工会可以这样做吗?
这称为派生表。
http://www.programmerinterview.com/index.php/database-sql/derived-table-vs-subquery/
SELECT Pedido1, COUNT(*) AS PedidoCount
FROM
(
SELECT Pedido1 FROM mydb.atendimentos
UNION ALL
SELECT Pedido2 FROM mydb.atendimentos
) T
GROUP BY Pedido1
ORDER BY Pedido1
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