Ms sql updating multiple rows dating who pays the bill
I am trying to update a field to the top X rows in a table when ordered by priority (descending).The Select statement would be SET ROWCOUNT = Top X SELECT * FROM Targets WHERE ID = TID ORDER BY Priority DESC I then want to update a field called TGT_Priority with a constant like 1000 for these rows.Performance Tip: The conditional behavior described for the MERGE statement works best when the two tables have a complex mixture of matching characteristics.For example, inserting a row if it doesn't exist, or updating a row if it matches.
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.
The TOP clause further reduces the number of joined rows to the specified value.
The insert, update, or delete actions apply to the remaining joined rows in an unordered way.
For greater detail, please follow the aforementioned link.
We'll use the following table for this example: In order to make multiple updates, you can use a CASE block in SQL combined with an appropriate WHERE clause to select the appropriate rows and set the different values.
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When simply updating one table based on the rows of another table, improve the performance and scalability with basic INSERT, UPDATE, and DELETE statements.