Appending rows returned from different queries int

问题:

I am having 3 queries, which takes data from 3 different tables (with joins) and their column names are pretty much same (or I made them same by using ASkeyword). Once the 3 queries are completed, I want to combine their results, so it looks like they are coming from one table. Please have a look at the below codes.

1st Query

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

2nd Query

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

3rd Query

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

Once these queries are done, I want to combine their results. Which means, Rows returned by the 2nd Query will be appended after the rows returned by the 1st query. Rows returned by the 3rd query will be appended after the rows returned by the 2nd query. Finally, I want to sort the final result by Updated_Date

How can I do this?

回答1:

Use UNION to combine the queries:

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

Sorting can be done by appending an order by clause after the last query, as follows:

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...;

Note that field1, field2... can be field names or field numbers (starting from 1).