Select the table name as a column in a UNION select query with MySQL?

You can use AS command for this. Let us first create a table −

mysql> create table DemoTable
   (
   Name varchar(20)
   );
Query OK, 0 rows affected (0.56 sec)

Insert records in the table using insert command −

mysql> insert into DemoTable values('John');
Query OK, 1 row affected (0.18 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable;

This will produce the following output −

+------+
| Name |
+------+
| John |
+------+
1 row in set (0.00 sec)

Here is the query to create the second table.

mysql> create table DemoTable2
   (
   Name varchar(20)
   );
Query OK, 0 rows affected (0.59 sec)

Insert records in the table using insert command −

mysql> insert into DemoTable2 values('Bob');
Query OK, 1 row affected (0.20 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable2;

This will produce the following output −

+------+
| Name |
+------+
| Bob  |
+------+
1 row in set (0.00 sec)

Following is the query to select the table name as a column in a UNION select query in MySQL −

mysql> select 'DemoTable' as DemoTable,Name from DemoTable
union
select 'DemoTable2' as DemoTable2,Name from DemoTable2
;

This will produce the following output −

+--------------+------+
| DemoTable    | Name |
+--------------+------+
| DemoTable    | John |
| DemoTable2   | Bob  |
+--------------+------+
2 rows in set (0.00 sec)