MySQL select to count values equal to 0 and greater than 0 from a column?


For this, use the CASE statement. Let us first create a table −

mysql> create table DemoTable
   (
   Number int
   );
Query OK, 0 rows affected (0.83 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(10);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values(0);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values(20);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values(50);
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable values(0);
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values(0);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values(40);
Query OK, 1 row affected (0.15 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

Output

+--------+
| Number |
+--------+
| 10     |
| 0      |
| 20     |
| 50     |
| 0      |
| 0      |
| 40     |
+--------+
7 rows in set (0.00 sec)

Let us now see how to select count values equal to 0 and greater than 0 from a column

mysql> select sum(case when Number > 0 then 1 else 0 end )
AS TotalValueWhichIsGreaterThanZero,
   sum(case when Number = 0 then 1 else 0 end) AS TotalValueWhichIsEqualToZero
   from DemoTable where Number >=0;

Output

+----------------------------------+------------------------------+
| TotalValueWhichIsGreaterThanZero | TotalValueWhichIsEqualToZero |
+----------------------------------+------------------------------+
| 4                                | 3                            |
+----------------------------------+------------------------------+
1 row in set (0.00 sec)
raja
Published on 13-Jun-2019 12:10:16
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