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When SET ANSI_PADDING OFF then CHAR data types are padded with spaces, VARCHAR data types have trailing spaces removed, and VARBINARY have trailing zeros removed.

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Knowing that esql Sales Person was originally populated by information from Sales we use knowledge to set up a query that pumps data from v Sales Person into esql Sales Person.

This is possible since the sales person’s full name is common to both tables. The OUTPUT clause is used to log changes made to rows affect by an UPDATE statement.

For example, a products dimension table has information about the products and you need to sync-up this table with the latest information about the products from the source table.

You would need to write separate INSERT, UPDATE and DELETE statements to refresh the target table with an updated product list or do lookups.

In this article we’ll explore how to use the UPDATE statement.

We discuss some best practices, limitations, and wrap-up with several examples.Though this article uses the Adventure Works database for its examples, I’ve decided to create an example table for use within the database to help better illustrate the examples. The SQL UPDATE statement is used to change column values.Though an update statement can modify columns data from many sources, such as literal values or other query results, the basic format is the same. ON DUPLICATE KEY UPDATE is a Maria DB/My SQL extension to the INSERT statement that, if it finds a duplicate unique or primary key, will instead perform an UPDATE.The row/s affected value is reported as 1 if a row is inserted, and 2 if a row is updated, unless the API's Where two rows match the unique keys match, only the first is updated.The UPDATE statement is complex and there are many elements to consider. For a full list check out the UPDATE (Transact-SQL) article.

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