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With transactional engines, triggers are executed in the same transaction as the statement that invoked them.
If a warning is issued with the SIGNAL or RESIGNAL statement (that is, an error with an SQLSTATE starting with '01'), it will be treated like an error.
It is very important to include the INNER JOIN to the INSERTED table so that only the updated rows are affected.
Using the clause WHERE Order Status='Approved' by itself to limit the rows updated will actually result in all rows with an Order Status value of Approved being updated at the same time.
If the engine is non-transactional, and it is an AFTER trigger, the trigger will not run, but the original statement will.
Here, we'll drop the above examples, and then recreate the trigger with an error, a field that doesn't exist, first using the default Inno DB, a transactional engine, and then again using My ISAM, a non-transactional engine.
To test the trigger, we will execute a T-SQL UPDATE statement to set the Order Status value to "Approved" for the first row in the table (pk ID = 1).
After the T-SQL UPDATE command, we then execute a T-SQL SELECT query to make sure the trigger executed correctly.
For example, you can set up a column called 'Done' and add a trigger so that any cards moved to that column will automatically be completed.The SHOW TRIGGERS statement returns similar information.