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How to select unique value in MySQL?
You can select unique value with the help of DISTINCT keyword.
The syntax is as follows
select distinct yourColumnName from yourTableName;
To understand the above syntax, let us create a table. The query to create a table is as follows
mysql> create table selectUniqueValue -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20), -> Age int -> ); Query OK, 0 rows affected (0.64 sec)
Insert some records in the table using insert command. The query is as follows −
mysql> insert into selectUniqueValue(Name,Age) values('John',21);
Query OK, 1 row affected (0.18 sec)
mysql> insert into selectUniqueValue(Name,Age) values('Carol',21);
Query OK, 1 row affected (0.13 sec)
mysql> insert into selectUniqueValue(Name,Age) values('Sam',22);
Query OK, 1 row affected (0.10 sec)
mysql> insert into selectUniqueValue(Name,Age) values('Mike',22);
Query OK, 1 row affected (0.16 sec)
mysql> insert into selectUniqueValue(Name,Age) values('David',22);
Query OK, 1 row affected (0.13 sec)
mysql> insert into selectUniqueValue(Name,Age) values('Larry',23);
Query OK, 1 row affected (0.12 sec)
mysql> insert into selectUniqueValue(Name,Age) values('Bob',23);
Query OK, 1 row affected (0.12 sec)
mysql> insert into selectUniqueValue(Name,Age) values('Maxwell',22);
Query OK, 1 row affected (0.19 sec)
mysql> insert into selectUniqueValue(Name,Age) values('Robert',21);
Query OK, 1 row affected (0.15 sec)Now you can display all records from the table using select statement. The query is as follows −
mysql> select *from selectUniqueValue;
The following is the output
+----+---------+------+ | Id | Name | Age | +----+---------+------+ | 1 | John | 21 | | 2 | Carol | 21 | | 3 | Sam | 22 | | 4 | Mike | 22 | | 5 | David | 22 | | 6 | Larry | 23 | | 7 | Bob | 23 | | 8 | Maxwell | 22 | | 9 | Robert | 21 | +----+---------+------+ 9 rows in set (0.00 sec)
The following is the query to select unique value
mysql> select distinct Age from selectUniqueValue;
The following is the output
+------+ | Age | +------+ | 21 | | 22 | | 23 | +------+ 3 rows in set (0.00 sec)
Updated on: 30-Jul-2019
2K+ Views
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