How to Combine Results from Two SQL Queries into a Single Result Set with Separate Columns?

Combining Multiple Query Results into Single Result Set

Combining results from multiple SQL queries into a single result set is a common task when dealing with complex queries or large datasets. This article demonstrates how to combine results from two queries into separate columns.

Original Queries

Consider the following two queries that return separate result sets:

Query 1:

SELECT SUM(Fdays) AS fDaysSum
FROM tblFieldDays
WHERE tblFieldDays.NameCode=35 AND tblFieldDays.WeekEnding=?

Query 2:

SELECT SUM(CHdays) AS hrsSum
FROM tblChargeHours
WHERE tblChargeHours.NameCode=35 AND tblChargeHours.WeekEnding=?

Combining Results

To combine the results of these two queries into a single result set, you can use the following approach:

Alias Both Queries

Alias the first query as "x" and the second query as "y" using the "AS" keyword.

SELECT x.a, y.b
FROM (SELECT * FROM a) AS x,
     (SELECT * FROM b) AS y

In this example, "x" represents the results of Query 1, and "y" represents the results of Query 2.

Select Columns from Aliases

Select the columns you want from each alias. In this case, we want the "fDaysSum" column from "x" and the "hrsSum" column from "y".

SELECT x.fDaysSum, y.hrsSum
FROM (SELECT * FROM a) AS x,
     (SELECT * FROM b) AS y

By executing this combined query, you will obtain a single result set that contains the results from both Query 1 and Query 2 as separate columns.

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