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MySQL query to count occurrences of distinct values and display the result in a new column?
Let us first create a table −
mysql> create table DemoTable ( Value int ); Query OK, 0 rows affected (0.57 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(80); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(90); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(90); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(80); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(90); Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-------+ | Value | +-------+ | 80 | | 90 | | 90 | | 80 | | 100| | 90 | +-------+ 6 rows in set (0.00 sec)
Following is the query to count occurrences of distinct values −
mysql> select Value,count(*) from DemoTable group by Value;
This will produce the following output −
+-------+----------+ | Value | count(*) | +-------+----------+ | 80 | 2 | | 90 | 3 | | 100 | 1 | +-------+----------+ 3 rows in set (0.00 sec)
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