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All INSTEAD OF triggers are fired for each row and you cannot narrow down the event by column.Instead you can check to see what columns are updated in the body of the trigger by using the UPDATING ('column_name') clause.I have highlighted the areas which differ compared with a normal cursor.
END LOOP cursor_loop; CLOSE cursor1; SET done=0; As a best practice, you should always reset your status variable to 0 after the cursor loop terminates; otherwise, subsequent or nested cursor loops may terminate prematurely.
So far in this series we've been concerned with simply reading data from tables using a cursor.
In this final part we'll look at how you can use a cursor to modify data as well.
There are many tasks well suited to cursors, but there are some common uses.
One is to loop through a recordset and update a single row in a table based on a single row lookup in another table.
With all the processing power that cursors provide, there is a downside in that large resultsets can be as slow as molasses to process.