Insert MAX(col)+1 into the same MySQL table?

Let us first create a table −

mysql> create table DemoTable1484
   -> (
   -> Id int
   -> );
Query OK, 0 rows affected (0.46 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1484 values(100);
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable1484 values(175);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable1484 values(165);
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable1484 values(145);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1484 values(170);
Query OK, 1 row affected (0.10 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1484;

This will produce the following output −

+------+
| Id   |
+------+
|  100 |
|  175 |
|  165 |
|  145 |
|  170 |
+------+
5 rows in set (0.00 sec)

Here is the query to insert MAX(col)+1 into the same table −

mysql> insert into DemoTable1484(Id) select max(Id)+1 from DemoTable1484;
Query OK, 1 row affected (0.20 sec)
Records: 1  Duplicates: 0  Warnings: 0

Let us check the table records once again −

mysql> select * from DemoTable1484;

This will produce the following output. The new value inserted successfully −

+------+
| Id   |
+------+
|  100 |
|  175 |
|  165 |
|  145 |
|  170 |
|  176 |
+------+
6 rows in set (0.00 sec)