Show Trigger - MySQL Triggers

In MySQL, a trigger is a set of SQL statements that are automatically executed in response to certain events. The "Show Trigger" command is used to display information about the triggers defined in a MySQL database. In this tutorial, we'll walk through the syntax and usage of the "Show Trigger" command.

Syntax

The syntax for using the "Show Trigger" command in MySQL is as follows:

SHOW TRIGGERS [FROM db_name] [LIKE 'pattern'];

In this syntax, "db_name" is the name of the database for which you want to show triggers. The "LIKE" clause is used to filter the information to display only triggers that match a certain pattern.

Example

Let's say we have a database called "mydb" that contains two triggers: "trg_before_insert" and "trg_after_update". Here's how we can use the "Show Trigger" command to display information about these triggers:

SHOW TRIGGERS FROM mydb;

This command will display information about all the triggers defined in the "mydb" database.

Output

When we run the "Show Trigger" command in MySQL, we'll see information about the triggers defined in the specified database. This information typically includes the name of the trigger, the table it is associated with, the timing of the trigger (e.g. "before insert"), the event that triggers the execution of the trigger (e.g. "insert"), and the SQL statement that makes up the trigger.

Explanation

In this tutorial, we discussed the "Show Trigger" command in MySQL, which is used to display information about the triggers defined in a MySQL database. We went over the syntax of the command and provided an example of how to use it to display information about the triggers in a hypothetical database called "mydb".

Use

The "Show Trigger" command is useful for understanding the triggers defined in a MySQL database and troubleshooting issues related to them. You can use this command to confirm that the triggers have been defined correctly, and to verify their properties.

Important Points

• The "Show Trigger" command is used to display information about the triggers defined in a MySQL database.
• The syntax for the "Show Trigger" command includes options for filtering the information to display only certain triggers.
• The output of the "Show Trigger" command typically includes information about the triggers' properties such as the name, table, timing, and SQL statement.
• You can use the "Show Trigger" command to confirm that triggers have been defined correctly and to troubleshoot issues related to them.

Summary

In this tutorial, we discussed the "Show Trigger" command in MySQL and how it can be used to display information about the triggers defined in a MySQL database. We covered the syntax, example, output, explanation, use, and important points of this command. With this knowledge, you can now use the "Show Trigger" command to troubleshoot issues related to triggers in your MySQL database.