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What does select @@identity do in MySQL?
The @@identity returns the last inserted value in the auto_increment column in the current session. Let us first create a table −
mysql> create table DemoTable( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserName varchar(100) ); Query OK, 0 rows affected (0.67 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(UserName) values('David');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(UserName) values('Mike');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(UserName) values('Carol');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(UserName) values('Robert');
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable(UserName) values('John');
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+--------+----------+ | UserId | UserName | +--------+----------+ | 1 | David | | 2 | Mike | | 3 | Carol | | 4 | Robert | | 5 | John | +--------+----------+ 5 rows in set (0.00 sec)
Now, we will use @@identity −
mysql> select @@identity;
This will produce the following output −
+------------+ | @@identity | +------------+ | 5 | +------------+ 1 row in set (0.00 sec)
Updated on: 27-Sep-2019
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