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MySQL Select where value exists more than once
For this, you can use GROUP BY HAVING along with the COUNT(*) function. Let us first create a table −
mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (0.47 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(50); Query OK, 1 row affected (0.27 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-------+ | Value | +-------+ | 20 | | 10 | | 30 | | 10 | | 30 | | 40 | | 50 | +-------+ 7 rows in set (0.00 sec)
Following is the query to select where value exists more than once −
mysql> select *from DemoTable -> group by Value -> having count(*) > 1;
This will produce the following output −
+-------+ | Value | +-------+ | 10 | | 30 | +-------+ 2 rows in set (0.38 sec)
Updated on: 13-Dec-2019
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