Question

我有3个查询，它从3个不同的表（带连接）获取数据，它们的列名相同（或者我使用AS关键字使它们相同）。一旦3个查询完成，我想结合他们的结果，所以看起来它们来自一个表。请看下面的代码。

第一次查询

SELECT Client_Portfolio.*,
Client.Name,
Provider.Name,
"One" AS Income_Type,
One.`One_Gross_Fee` AS "Gross_Fee",
One.`One_V_Fee` AS "V_Fee",
One.`One_E_Fee` AS "E_Fee",
One.`One_I_Fee` AS "I_Fee",
One.`One_Tax_Provision` AS "Tax_Provision",
One.`One_Net_Income` AS "Net_Income",
"N/A" AS VAT,
One.`Updated_Date`
FROM Client_Portfolio
INNER JOIN Portfolio ON Portfolio.`idPortfolio` = Client_Portfolio.`idPortfolio`
INNER JOIN Client ON Client.idClient = Client_Portfolio.idClient
JOIN Provider ON Provider.idProvider = Portfolio.idProvider
INNER JOIN One ON One.idPortfolio = Portfolio.idPortfolio

第二次查询

SELECT Client_Portfolio.*,
Client.Name,
Provider.Name,
"Two" AS Income_Type,
Two.`Two_Gross_Fee` AS "Gross_Fee",
Two.`Two_V_Fee` AS "V_Fee",
Two.`Two_E_Fee` AS "E_Fee",
Two.`Two_I_Fee` AS "I_Fee",
Two.`Two_Tax_Provision` AS "Tax_Provision",
Two.`Two_Net_Income` AS "Net_Income",
Two.`Two_Vat` AS VAT,
Two.`Updated_Date`
FROM Client_Portfolio
INNER JOIN Portfolio ON Portfolio.`idPortfolio` = Client_Portfolio.`idPortfolio`
INNER JOIN Client ON Client.idClient = Client_Portfolio.idClient
JOIN Provider ON Provider.idProvider = Portfolio.idProvider
INNER JOIN Two ON Two.idPortfolio = Portfolio.idPortfolio

第三次查询

SELECT Client_Portfolio.*,
Client.Name,
Provider.Name,
"Three" AS Income_Type,
Three.`Three_Gross_Fee` AS "Gross_Fee",
"N\A" AS "V_Fee",
Three.`Three_E_Fee` AS "E_Fee",
"N\A" AS "I_Fee",
Three.`Three_Tax_Provision` AS "Tax_Provision",
Three.`Three_Net_Income` AS "Net_Income",
Three.`Three_Vat` AS VAT,
Three.`Updated_Date`
FROM Client_Portfolio
INNER JOIN Portfolio ON Portfolio.`idPortfolio` = Client_Portfolio.`idPortfolio`
INNER JOIN Client ON Client.idClient = Client_Portfolio.idClient
JOIN Provider ON Provider.idProvider = Portfolio.idProvider
INNER JOIN Three ON Three.idPortfolio = Portfolio.idPortfolio

完成这些查询后，我想结合他们的结果。这意味着，第二个查询返回的行将在第一个查询返回的行之后追加。第三个查询返回的行将追加到由第三个查询返回的行之后。第二个查询。最后，我想按Updated_Date

对最终结果进行排序

我该怎么做？

Answer 1

使用UNION组合查询：

SELECT one_fields FROM Client_Portfolio ...
UNION
SELECT two_fields FROM Client_Portfolio ...
UNION
SELECT three_fields FROM Client_Portfolio ...

可以通过在最后一个查询之后附加order by子句来完成排序，如下所示：

SELECT one_fields FROM Client_Portfolio ...
UNION
SELECT two_fields FROM Client_Portfolio ...
UNION
SELECT three_fields FROM Client_Portfolio ...
ORDER BY field1, field2, field3...;

请注意，field1，field2 ...可以是字段名称或字段编号（从1开始）。

将从不同查询返回的行追加到一个中

1 个答案: