Query MySQL database to echo highest auto incremented number?

Let us first create a table with Id as auto_increment −

mysql> create table DemoTable (    UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    UserName varchar(20) ); Query OK, 0 rows affected (0.56 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(UserName) values('John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(UserName) values('Larry'); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable(UserName) values('Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(UserName) values('Bob'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(UserName) values('Carol'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(UserName) values('David'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(UserName) values('Robert'); Query OK, 1 row affected (0.20 sec)

Following is the query to display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+--------+----------+ | UserId | UserName | +--------+----------+ | 1 | John | | 2 | Larry | | 3 | Chris | | 4 | Bob | | 5 | Carol | | 6 | David | | 7 | Robert | +--------+----------+ 7 rows in set (0.00 sec)

Here is the query to echo highest auto incremented number −

mysql> select *from DemoTable order by UserId desc limit 0,1;

This will produce the following output displaying the highest auto incremented value −

+--------+----------+ | UserId | UserName | +--------+----------+ | 7 | Robert | +--------+----------+ 1 row in set (0.00 sec)