When we create a scheduled event in MySQL, we have the option of adding a comment to the event. This comment can be a string of up to 64 characters. We have a couple of options when it comes to viewing the comment of an existing event.
MySQL
How to Rename a Scheduled Event in MySQL
In MySQL we can use the ALTER EVENT statement to make changes to existing scheduled events, including changing the name of the event.
2 Ways to Drop an Event in MySQL
In MySQL, scheduled events are tasks that run according to a specified schedule. When we no longer require an event we can drop it so that it doesn’t take up unnecessary room in the system. We have a couple of ways of going about this.
How to Enable/Disable a Scheduled Event in MySQL
When we create a scheduled event in MySQL, it’s enabled by default. But we can change this.
We can create an event in disabled status, then enable it later. Or we can do the opposite – create it as an enabled event and then disable it later.
How to “Unhide” a GIPK in MySQL
In MySQL, GIPKs are invisible by definition. GIPK stands for generated invisible primary key, and it’s basically an invisible column automatically created by MySQL with a primary key constraint.
However, just because GIPKs are automatically created invisible, it doesn’t mean that we can’t “unhide” them – or make them visible.
We can make a GIPK visible just as we would make any other invisible column visible – use the ALTER TABLE statement to set it to VISIBLE.
Create a Generated Invisible Primary Key (GIPK) in MySQL
MySQL 8.0.30 introduced generated invisible primary keys (GIPKs), which are primary keys that are automatically created whenever we create a table without explicitly defining a primary key.
GIPKs only work with the InnoDB storage engine, and they only work when we have GIPKs enabled.
In this article, I check whether or not GIPKs are enabled on my system, I then enable GIPKs, and finally I create a table with a GIPK.
Remove the Comment from an Event in MySQL
When we create a scheduled event in MySQL we have the option of using the COMMENT clause to add a comment to the event. Comments can be a handy addition that help explain what the event does, why it was created, etc.
So it’s probably quite rare that we would want to remove the comment from an event. But in the event that we do (pun intended!), we can simply update the event with a blank comment.
Create an Event in MySQL
In MySQL we can create scheduled events, which are basically tasks that run according to a specified schedule.
We create scheduled events with the CREATE EVENT statement.
When we do this, we specify the schedule as well as the task to run.
2 Ways to List Scheduled Events in MySQL
In MySQL we can create scheduled events, which are tasks that run according to a specified schedule.
At any given time we can get a list of events for a given schema by using either of the following methods.
Move a Scheduled Event to Another Database in MySQL
In MySQL scheduled events are tasks that run according to a given schedule. After creating a scheduled event, we can modify it using the ALTER EVENT statement. This statement allows us to change the event’s definition, change its schedule, enable/disable it, rename it, and more. It also allows us to move the event to another database.
To move an event to another database, we use the ALTER EVENT statement with the RENAME clause, prefixing the event name with the database name (using dot notation).