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MySQL - SHOW EVENTS Statement
MySQL SHOW EVENTS Statement
A MySQL Event is nothing but a task that execute at a particular schedule. An event can contain one or more MySQL statements these statements are stored in the databases and gets executed at the specified schedule.
The SHOW EVENTS statement lists (information about) the events in the specified schema.
Syntax
Following is the syntax of the MySQL SHOW EVENTS statement −
SHOW EVENTS [{FROM | IN} schema_name] [LIKE 'pattern' | WHERE expr]
Example
Assume we have created a table with name data and create an event which inserts records into it.
CREATE TABLE Data (Name VARCHAR(255), age INT); CREATE EVENT sample_event ON SCHEDULE EVERY 1 MONTH DO TRUNCATE TABLE data;
Following query lists the events in the current database −
SHOW EVENTS\G;
Output
Once the query is executed, it will produce the output shown below −
************* 1. row ************* Db: test Name: event_hourly Definer: root@localhost Time zone: SYSTEM Type: RECURRING Execute at: NULL Interval value: 1 Interval field: MONTH Starts: 2023-12-05 14:51:03 Ends: NULL Status: ENABLED Originator: 1 character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: utf8mb4_0900_ai_ci ************* 2. row ************* Db: test Name: new_event_name Definer: root@localhost Time zone: SYSTEM Type: RECURRING Execute at: NULL Interval value: 1 Interval field: MONTH Starts: 2023-12-04 14:08:03 Ends: NULL Status: ENABLED Originator: 1 character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: utf8mb4_0900_ai_ci ************* 3. row ************* Db: test Name: sample_event Definer: root@localhost Time zone: SYSTEM Type: RECURRING Execute at: NULL Interval value: 1 Interval field: MONTH Starts: 2023-12-13 12:01:05 Ends: NULL Status: ENABLED Originator: 1 character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: utf8mb4_0900_ai_ci
FROM or IN clause
You can retrieve the description of events from a specific database using the FROM clause.
Example
Assume we have created a database named demo using the CREATE DATABASE statement −
CREATE DATABASE demo;
Now, let us create a table in it, using the CREATE TABLE statement −
CREATE TABLE demo.Data (Name VARCHAR(255), age INT);
Let us create two events with names example_event1 and example_event2 it inserts a record in the above created table one minute after the execution −
CREATE EVENT demo.example_event ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 Hour DO INSERT INTO new.Data VALUES('Rahman', 25); CREATE EVENT demo.event_hourly ON SCHEDULE EVERY 1 MONTH DO TRUNCATE TABLE data;
Following query lists out all the (upcoming) events in the database named demo −
SHOW EVENTS FROM demo\G;
Output
Following is the output of the above query −
************* 1. row ************* Db: demo Name: event_hourly Definer: root@localhost Time zone: SYSTEM Type: RECURRING Execute at: NULL Interval value: 1 Interval field: MONTH Starts: 2021-05-12 22:13:53 Ends: NULL Status: ENABLED Originator: 1 character_set_client: utf8mb4 collation_connection: utf8mb4_0900_ai_ci Database Collation: utf8mb4_0900_ai_ci ************* 2. row ************* Db: demo Name: example_event Definer: root@localhost Time zone: SYSTEM Type: ONE TIME Execute at: 2021-05-12 23:13:10 Interval value: NULL Interval field: NULL Starts: NULL Ends: NULL Status: ENABLED Originator: 1 character_set_client: utf8mb4 collation_connection: utf8mb4_0900_ai_ci Database Collation: utf8mb4_0900_ai_ci 2 rows in set (0.26 sec)
You can also use the IN clause instead of FROM as −
SHOW EVENTS IN demo\G;
Output
After executing the above query, it generates the output shown below −
************** 1. row ************** Db: demo Name: event_hourly Definer: root@localhost Time zone: SYSTEM Type: RECURRING Execute at: NULL Interval value: 1 Interval field: MONTH Starts: 2023-12-13 12:04:41 Ends: NULL Status: ENABLED Originator: 1 character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: utf8mb4_0900_ai_ci ************** 2. row ************** Db: demo Name: example_event Definer: root@localhost Time zone: SYSTEM Type: ONE TIME Execute at: 2023-12-13 13:04:35 Interval value: NULL Interval field: NULL Starts: NULL Ends: NULL Status: ENABLED Originator: 1 character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: utf8mb4_0900_ai_ci
The LIKE clause
Using the LIKE clause, you can specify a pattern to retrieve specific tables. Following query retrieves the information about the events whose name starts with the letter "e".
SHOW EVENTS LIKE 'e%'\G;
Output
Following is the output of the above query −
************** 1. row ************** Db: demo Name: event_hourly Definer: root@localhost Time zone: SYSTEM Type: RECURRING Execute at: NULL Interval value: 1 Interval field: MONTH Starts: 2023-12-13 12:04:41 Ends: NULL Status: ENABLED Originator: 1 character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: utf8mb4_0900_ai_ci ************** 2. row ************** Db: demo Name: example_event Definer: root@localhost Time zone: SYSTEM Type: ONE TIME Execute at: 2023-12-13 13:04:35 Interval value: NULL Interval field: NULL Starts: NULL Ends: NULL Status: ENABLED Originator: 1 character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: utf8mb4_0900_ai_ci
The WHERE clause
You can use the WHERE clause of the SHOW EVENTS statements to retrieve names of the tables which match the specified condition.
Example
Following query lists out event which is of type recurring from the database named demo. Here we are using the SHOW EVENTS statement with WHERE clause.
SHOW EVENTS FROM demo WHERE Type = 'RECURRING'\G;
Output
After executing the above query, it will generate the following output −
*************************** 1. row *************************** Db: demo Name: event_hourly Definer: root@localhost Time zone: SYSTEM Type: RECURRING Execute at: NULL Interval value: 1 Interval field: MONTH Starts: 2023-12-13 12:04:41 Ends: NULL Status: ENABLED Originator: 1 character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: utf8mb4_0900_ai_ci