UNION - Merging Outputs from Two Queries Together in SQL Server

Q

How To Use UNION to Merge Outputs from Two Queries Together in SQL Server?

✍: FYIcenter.com

A

If you have two queries that returns the same row fields, you can merge their outputs together with the UNION operator. The following tutorial exercise shows you how to use the UNION operator:

SELECT * FROM fyi_links WHERE tag = 'DBA'
GO
id   url                notes  counts  created     tag
102  dba.fyicenter.com  NULL   972     2007-05-19  DBA
104  www.mysql.com             390     2006-01-01  DBA
105  www.oracle.com            960     2005-01-01  DBA

SELECT * FROM fyi_links WHERE tag = 'DEV'
GO
id   url                notes  counts  created     tag
101  dev.fyicenter.com  NULL   120     2006-04-30  DEV
106  www.php.net               439     2004-01-01  DEV

SELECT * FROM fyi_links WHERE tag = 'DBA'
UNION
SELECT * FROM fyi_links WHERE tag = 'DEV'
GO
id   url                notes  counts  created     tag
102  dba.fyicenter.com  NULL   972     2007-05-19  DBA
104  www.mysql.com             390     2006-01-01  DBA
105  www.oracle.com            960     2005-01-01  DBA
101  dev.fyicenter.com  NULL   120     2006-04-30  DEV
106  www.php.net               439     2004-01-01  DEV

⇒ Using ORDER BY with UNION Operators in SQL Server

⇐ Returning the Second 5 Rows from a Query in SQL Server

⇑ Using SELECT Statements with Joins and Subqueries in SQL Server

⇑⇑ SQL Server Database Tutorials

2016-10-26, 2360🔥, 0💬

What Is a SELECT Query Statement in SQL Server
What Is a SELECT Query Statement in SQL Server? The SELECT statement is also called the query statement. It is the most frequently used SQL statement in any database application. SELECT statements allows you to retrieve data from one or more tables or views, with different selection criteria, groupi... 2016-10-26, 2640🔥, 0💬

Using ORDER BY with UNION Operators in SQL Server
How To Use ORDER BY with UNION Operators in SQL Server? If you need to sort the output from two queries grouped together with a UNION operator, you need to apply the ORDER BY clause at the group level, not at the subquery level. Note that SQL Server and MySQL react differently to the ORDER BY clause... 2016-10-26, 2634🔥, 0💬

Using SELECT Statements and GROUP BY Clauses in SQL Server
Where to find answers to frequently asked questions on Using SELECT Statements and GROUP BY Clauses in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Using SELECT Statements and GROUP BY Clauses in SQL Server. Clear answers are provid... 2016-10-26, 2557🔥, 0💬

Testing Table for SELECT Statements in SQL Server
How To Create a Testing Table with Test Data to try with SELECT statements in SQL Server? If you want to follow the tutorial exercises presented in this collection, you need to create a testing table and insert some test data, as shown in the following sample script: CREATE TABLE fyi_links (id INTEG... 2016-10-26, 2518🔥, 0💬

Returning the Second 5 Rows from a Query in SQL Server
How To Return the Second 5 Rows in SQL Server? If you want to display query output in multiple pages with 5 rows per page, and the visitor wants to see the output for the second page, you need to display query output from row 6 to row 10. If you are using MySQL server, you can use the "LIMIT startRo... 2016-10-29, 2478🔥, 0💬

Using Subqueries with the EXISTS Operators in SQL Server
How To Use Subqueries with the EXISTS Operators in SQL Server? A subquery can be used with the EXISTS operator as "EXISTS (subquery)", which returns true if the subquery returns one or more rows. The following statement is a good example of "EXISTS (subquery)". It returns rows from fyi_links table t... 2016-10-29, 2456🔥, 0💬

Using Subqueries in the FROM Clause in SQL Server
How To Use Subqueries in the FROM Clause in SQL Server? If you have a query returning many rows of data, and you want to perform another query on those rows, you can put the first query as a subquery in the FROM clause of the second query. A subquery used in this way become a temporary table, and yo... 2016-10-29, 2445🔥, 0💬

Counting Groups Returned with the GROUP BY Clause in SQL Server
How To Count Groups Returned with the GROUP BY Clause in SQL Server? If you use the COUNT(*) function on groups returned with the GROUP BY clause, it will count the number of rows within each group, not the number of groups. If you want to count the number of groups, you can put the GROUP BY query i... 2016-10-29, 2406🔥, 0💬

UNION - Merging Outputs from Two Queries Together in SQL Server
How To Use UNION to Merge Outputs from Two Queries Together in SQL Server? If you have two queries that returns the same row fields, you can merge their outputs together with the UNION operator. The following tutorial exercise shows you how to use the UNION operator: SELECT * FROM fyi_links WHERE ta... 2016-10-26, 2361🔥, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.