Manage Data Over Time with SQL Server MERGE Statement
Once data is in a table it needs to be maintained....
2023-02-15
MERGE
Getting started with the SQL MERGE statement
This article is focused on beginners who have already started writing SQL queries and are now diving deep towards more data processing and complex queries in SQL. When we talk about data processing, an important concept that comes to our mind is performing ETL workloads to a data warehouse. ETL is a very complex topic […]
2021-01-26
4,930 reads
SQL Server MERGE statement usage and examples
In this tip we look at how to use MERGE compared to running separate INSERT and UPDATE statements.
2018-09-26
3,483 reads
Using the MERGE Statement to Perform an UPSERT
The term UPSERT has been coined to refer to an operation that inserts rows into a table if they don’t exist, otherwise they are updated. To perform the UPSERT operation Microsoft introduced the MERGE statement. Not only does the MERGE statement support the UPSERT concept, but it also supports deleting records. Greg Larsen discusses how to use the MERGE statement to UPDATE, INSERT and DELETE records from a target table.
2014-12-22
13,060 reads
Create MERGE statements with data!
A script to create MERGE statements with data for specific tables.
2015-09-03 (first published: 2014-05-19)
5,213 reads
Performance of the SQL MERGE vs. INSERT/UPDATE
The SQL MERGE statement offers convenience, safety and elegance, but how does it perform compared to other methods?
2017-02-03 (first published: 2013-10-28)
170,509 reads
A Hazard of Using the SQL Merge Statement
The SQL MERGE statement can make your DML querying more efficient but you need to take care or you may get burned
2013-04-03
24,689 reads
Using the SQL Server MERGE Statement to Process Type 2 Slowly Changing Dimensions
The MERGE statement is powerful and multifunctional, yet it can be hard to master. SOmetimes the MERGE statement that just doesn't do what it's needed to do, like process a Type 2 slowly-changing dimension. Check out this tip to learn more.
2013-03-08
3,847 reads
2013-02-14
2,257 reads
2012-06-20 (first published: 2012-05-30)
8,774 reads
Blogs
Using the Data API Builder–VS Live San Diego Resources
By Steve Jones
Thanks for attending my sessions. Resources below: Slides: Using Data API Builder GitHub repo: ...
Running a Local LLM On Your Laptop Resources
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Thanks to everyone that attended my sessions at VS Live San Diego yesterday. It...
Differences Between xp_readerrolog and sp_readerrorlog: #SQLNewBlogger
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I was creating a question on sp_readerrorlog and realized that this procedure is different...
Forums
Implementing Type 4 Slowly Changing Dimensions in SQL Server
Comments posted to this topic are about the item Implementing Type 4 Slowly Changing...
The Disabled Index
Comments posted to this topic are about the item The Disabled Index
Server-Level Table sizes
Comments posted to this topic are about the item Server-Level Table sizes
Question of the Day
The Disabled Index
I run this code on SQL Server 2022.
CREATE TABLE Drink
(
drinkid INT NOT NULL
CONSTRAINT DrinkPK PRIMARY KEY CLUSTERED,
drinkname VARCHAR(20),
rating NUMERIC(2, 1)
)
GO
INSERT INTO Drink
(
drinkid,
drinkname,
rating
)
VALUES
(1, 'Margarita', 4.5),
(2, 'Mojito', 4.3),
(3, 'Old Fashioned', 4.7),
(4, 'Martini', 4.4),
(5, 'Cosmopolitan', 4.2)
GO
ALTER INDEX drinkpk ON dbo.drink DISABLE
GO
SELECT * FROM dbo.Drink
GO
What is the result? See possible answers