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Select distinct names from two columns in MySQL and display the result in a single column
For this, use UNION. Let us first create a table −
mysql> create table DemoTable ( Name1 varchar(100), Name2 varchar(100) ); Query OK, 0 rows affected (0.58 sec)
Insert some records in the table using insert command
mysql> insert into DemoTable values('Adam','Bob');
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable values('Adam','Bob');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('David','Chris');
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 −
+-------+-------+ | Name1 | Name2 | +-------+-------+ | Adam | Bob | | Adam | Bob | | David | Chris | +-------+-------+ 3 rows in set (0.00 sec)
Following is the query to select distinct names from two columns −
mysql> select Name1 from DemoTable UNION select Name2 from DemoTable;
This will produce the following output −
+-------+ | Name1 | +-------+ | Adam | | David | | Bob | | Chris | +-------+ 4 rows in set (0.02 sec)
Updated on: 25-Sep-2019
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