Sql updating a table from itself

These statements allow you to view and modify data. In this article we look at how we can add, modify, and remove data with the INSERT, UPDATE, and DELETE statements. All the examples for this lesson are based on Microsoft SQL Server Management Studio and the Adventure Works2012 database.You can get started using these free tools using my Guide The INSERT statement is used to add one or more rows to a database table.Like the INSERT statement, the DELETE statement can be part of a transaction. Do worry if you don’t complete understand how merge works, we’ll revisit in detail in another article.Based on the success of the transaction you can either COMMIT or ROLLBACK the changes. Modified Date = GETDATE() WHEN NOT MATCHED THEN INSERT (Business Entity ID, Account Number, Name, Credit Rating, Preferred Vendor Status, Active Flag, Modified Date) VALUES (Source. This article serves as an introduction to various ways you can use SQL to modify data within your database.

It is a good trick you can use when you want to test out an insert but don’t want it to persist.By doing this I can guarantee I’m updating the correct row.Care should be taken when writing the UPDATE statement.Once a delete statement completes, @@ROWCOUNT is updated to reflect the number of rows affected. The basic structure of the DELETE statement is When you run this statement, the specified rows are removed from the table.

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