Combine columns into rows with MySQL?

To combine columns into rows, use UNION ALL. Following is the syntax −

Syntax

select yourColumnName1 from yourTableName    union all select yourColumnName2 from yourTableName;

Let us first create a table −

mysql> create table DemoTable    -> (    -> Value1 int,    -> Value2 int    -> ); Query OK, 0 rows affected (0.88 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(100,200); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(500,600); 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 −

+--------+--------+ | Value1 | Value2 | +--------+--------+ |    100 |    200 | |    500 |    600 | +--------+--------+ 2 rows in set (0.00 sec)

Here is the query to combine columns into rows −

mysql> select Value1 from DemoTable    -> union all    -> select Value2 from DemoTable;

This will produce the following output −

+--------+ | Value1 | +--------+ |    100 | |    500 | |    200 | |    600 | +--------+ 4 rows in set (0.00 sec)