Count zero, NULL and distinct values except zero and NULL with a single MySQL query

Let us first create a table −

mysql> create table DemoTable(    Value int ); Query OK, 0 rows affected (1.35 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values(NULL); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.59 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.70 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(NULL); Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------+ | Value | +-------+ | 10 | | NULL | | 10 | | 0 | | 20 | | 10 | | 0 | | NULL | +-------+ 8 rows in set (0.00 sec)

Following is the query to group by on all values except null and 0 −

mysql> select sum(Value is null) as NumberOfNull, sum(Value=0) as NumberOfZero, count(distinct Value > 0) as ValueExceptZeroAndNull from DemoTable;

This will produce the following output −

+--------------+--------------+------------------------+ | NumberOfNull | NumberOfZero | ValueExceptZeroAndNull | +--------------+--------------+------------------------+ | 2 | 2 | 2 | +--------------+--------------+------------------------+ 1 row in set (0.00 sec)