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You can run the following to do so and then verify all cities are NULL. Sure, you could run a query before the update, one after the update, and then compare, but rather than doing all of that we can use the OUTPUT clause to log the changes directly into a table.

Recall the INNER JOIN clause is used to match the rows from one table to another using a join condition. The complete script to run to log the output into a temporary table is: This statement defines a table with three columns and names the table variable @Update Log.

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

We discuss some best practices, limitations, and wrap-up with several examples.

UPDATE summary_data SET current_category = (SELECT category_id FROM products WHERE products.product_id = summary_data.product_id) WHERE EXISTS (SELECT category_id FROM products WHERE products.product_id = summary_data.product_id); If you want to test your skills using the SQL UPDATE statement, try some of our practice exercises.

These exercises allow you to try out your skills with the UPDATE statement.

The UPDATE statement is complex and there are many elements to consider. For a full list check out the UPDATE (Transact-SQL) article.

Keep in mind that when updating data in columns whose data type is CHAR, VARCHAR, or VARBINARY, the padding or truncation of data depends upon the SET ANSI_PADDING setting.Since this is an exclusive lock, not other transaction can modify data on this table, until the one which originally placed the lock is completed.In this example, we’re going to show you how to update’s column values based on a match to another table.In the diagram below you’ll see where there is a match between these two tables: By matching esql Sales Person. Notice here we’re constructing a full name from the views First Name and Last Name columns. So, once we have the join, the last bit of business to it do the update. Suppose the Sales Last Year figures were found to be incorrect and needed to be adjusted by five percent.Full Name to v Sales Person we can update esql Sales Person. Before we go much further, let’s first wipe out the city column values. You can easily adjust the values using the following statement: However, suppose the sales department want a record of all changes.This “all or nothing” behavior can be modified for arithmetic errors. An exclusive (X) lock is always placed on a table when an update is run.

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