Question

Howsit everyone

我正在尝试做一些我认为在MYSQL上不可能的事情。

我们有一个非常大的数据库，我们从中为我们的产品提取生产报告。目前，我们运行多个查询以获取这些结果，然后手动将数据传输到表中，然后将其发送给需要报告的任何人。

是否有更简单的方法来执行此操作。 IE单个查询。

我运行的查询示例

a. SELECT count(id) from ProductA_T where created between '<date>' and '<date>' and productstatus = "<successful>";
b. SELECT count(id) from ProductB_T where created between '<date>' and '<date>' and productstatus = "<successful>";
c. SELECT count(id) from ProductC_T where created between '<date>' and '<date>' and productstatus = "<successful>";

我正在寻找

的结果示例

产品A产品B产品C
500 500 500

Answer 1

您可以将所有内容放入Select子句中，如下所示：

Select
(SELECT count(id) from ProductA_T where created between '<date>' and '<date>' and productstatus = "<successful>") as CountA
(SELECT count(id) from ProductB_T where created between '<date>' and '<date>' and productstatus = "<successful>") as CountB
(SELECT count(id) from ProductC_T where created between '<date>' and '<date>' and productstatus = "<successful>") as CountC

这样你就会有这样的输入：

CountA CountB CountC
500 500 500

稍后您可以轻松添加更多计数

Answer 2

您可以使用UNION ALL：

SELECT 'ProductA', count(id) from ProductA_T where created between '<date>' and '<date>' and productstatus = "<successful>"
UNION ALL
SELECT 'ProductB', count(id) from ProductB_T where created between '<date>' and '<date>' and productstatus = "<successful>"
UNION ALL
SELECT 'ProductC', count(id) from ProductC_T where created between '<date>' and '<date>' and productstatus = "<successful>";

当然，您可以复制其他4种产品的选择或任何您想要的数量; - ）

Answer 3

我认为您需要使用存储过程

Create StoredProcedure SP_Name_1
As
Beign
Declare @id1 int,@id2 int,@id3 int;
SELECT @id1 = count(id) from ProductA_T where created between '<date>' and '<date>' and productstatus = "<successful>";
SELECT @id2 = count(id) from ProductB_T where created between '<date>' and '<date>' and productstatus = "<successful>";
SELECT @id2 = count(id) from ProductC_T where created between '<date>' and '<date>' and productstatus = "<successful>";

select  @id1 as ProductA ,@id2 as ProductB ,@id3 as ProductC
End

谢谢，塔哈

多个SQL计入单个结果集

3 个答案: