Syntax error Select distinct values from two columns in MySQL?

Select distinct values from two columns in MySQL?

To select distinct values from two columns, use UNION. Let us first create a table −

mysql> create table DemoTable1
(
   Value1 int
);
Query OK, 0 rows affected (0.56 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1 values(1);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable1 values(2);
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable1 values(3);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1 values(4);
Query OK, 1 row affected (0.12 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable1;

This will produce the following output −

+--------+
| Value1 |
+--------+
|      1 |
|      2 |
|      3 |
|      4 |
+--------+
4 rows in set (0.00 sec)

Following is the query to create the second table −

mysql> create table DemoTable2
(
   Value2 int
);
Query OK, 0 rows affected (0.62 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable2 values(3);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable2 values(4);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable2 values(5);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable2 values(6);
Query OK, 1 row affected (0.08 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable2;

This will produce the following output −

+--------+
| Value2 |
+--------+
|      3 |
|      4 |
|      5 |
|      6 |
+--------+
4 rows in set (0.00 sec)

Following is the query to select distinct values from two columns −

mysql> select Value1 from DemoTable1
UNION
select Value2 from DemoTable2;

This will produce the following output −

+--------+
| Value1 |
+--------+
|      1 |
|      2 |
|      3 |
|      4 |
|      5 |
|      6 |
+--------+
6 rows in set (0.00 sec)
Updated on: 2019-09-26T08:04:17+05:30

557 Views

Kickstart Your Career

Get certified by completing the course

Get Started
Advertisements