May 20, 2010 at 9:00 am
Hi,
I am Jr. DBA at my company and recently I come across a lot of code writing by somebody else utilizing MERGE command. I read a big description of this command but I don't fully understand.
I understand it is new in 2008 version.
Could somebody please explain it? I will greatly appreciate it. Thank you!
May 20, 2010 at 9:06 am
Oksana March (5/20/2010)
Hi,I am Jr. DBA at my company and recently I come across a lot of code writing by somebody else utilizing MERGE command. I read a big description of this command but I don't fully understand.
I understand it is new in 2008 version.
Could somebody please explain it? I will greatly appreciate it. Thank you!
In a nutshell...
Picture this, merge command "merges" the content of table_a into table_b.
For rows that do not exist in table_b merge implements an insert statement.
For rows that already exist in table_b merge implements an update statement.
Note: for "exists" I mean merge keys on table_a and table_b match.
_____________________________________
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at Amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.Viewing 2 posts - 1 through 1 (of 1 total)
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