UNION

External Article

UNION vs. UNION ALL in SQL Server

  • Article

Sometimes there is a need to combine data from multiple tables or views into one comprehensive dataset. This may be for like tables within the same database or maybe there is a need to combine like data across databases or even across servers. I have read about the UNION and UNION ALL commands, but how do these work and how do they differ?

2019-12-05

Blogs

From Planning to Practice: Setting Up Your FinOps Framework

By

As someone who works in DevOps, I’m always focused on creating systems that are...

“We love to debate minutiae”

By

I am guilty as charged. The quote was in reference to how people argue...

Advice I Like: Knots

By

Learn how to tie a bowline knot. Practice in the dark. With one hand....

Read the latest Blogs

Forums

Restoring On Top II

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Restoring On Top II

SQL Art 2: St Patrick’s Day in SSMS (Shamrock + Pint + Pixel Text)

By Terry Jago

Comments posted to this topic are about the item SQL Art 2: St Patrick’s...

Breaking Down Your Work

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Breaking Down Your Work

Visit the forum

Question of the Day

Restoring On Top II

I have a database, DNRTest, that has a number of tables and other objects in it. The other day, I was trying to mock up a test and ran this code on the same server: 

-- run yesterday
CREATE DATABASE DNRTest2
GO
USE DNRTest2
GO
CREATE TABLE NewTable (id INT)
GO
Today, I realize that I need a copy of DNRTest for another mockup, and I run this: 
-- run today
USE Master
BACKUP DATABASE DNRTest TO DISK = 'dnrtest.bak'
GO
RESTORE DATABASE DNRTest2 FROM DISK = 'dnrtest.bak' WITH REPLACE
What happens?

See possible answers