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The best part of querying is that it’s almost impossible to mess up a database when all you’re doing is mining it for information.
Before I discuss INSERT and UPDATE, let me make one thing perfectly clear: You can do a lot of harm with these commands because they affect your data.
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In previous SQL tutorials, I’ve demonstrated tricks for using the SELECT command to find and display data stored in your SQL tables.
Often to satisfy business requirements there arises a need to change some value or values in a table or tables.
Sometimes it may be to make a change to a large number of records, and sometimes the change will only be applied to individual records — updating a person’s last name or phone number, for example.
My other SQL lessons dealt exclusively with viewing data.
The ability to query a table provides the help desk pro with a powerful troubleshooting tool.
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Please read the Microsoft KB article link provided at the conclusion of this tutorial.