How to get count in same table including zero count values

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I Have 4 Request Status ID (0,1,2,3)

I have this table structure with data

C#

INSERT INTO `test` (`Requestid`, `RequestStatusID`) VALUES
(1,  '0'),
(2,  '0'),
(3,  '2'),
(4,  '2'),
(5,  '3');

I need to count the Counts for all RequestStatusID with this query:

SELECT COUNT(*) AS Counts,RequestStatusID FROM tblRequest GROUP BY RequestStatusID

this return following column

C#

   | Counts      |RequestStatusID
_________________________________
1  |  2          |      0
_________________________________
2  |  2          |      2
_________________________________
3  |  1          |      3

This works but the problem is that i need to display all results even if the count result is 0.
That means it does not display count result is 0.

The output should be

C#

   |Counts       |RequestStatusID
_________________________________
1  |  2          |      0
_________________________________
2  |  0          |      1
_________________________________
3  |  2          |      2
_________________________________
4  |  1          |      3

What I have tried:

I need to count the Counts for all RequestStatusID even if the count result is 0.

Posted 28-Apr-16 21:05pm

Vikas Hire

Updated 29-Apr-16 0:28am

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Nigam,Ashish 29-Apr-16 3:13am

where is requestStatusId 1 in your table? You are not inserting requestedStatusId 1 in your table. then How you will get 1 in RequestedStatusId?

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iamcpmember · Accepted Answer · 2016-04-29T00:28:00

you can try this:

I have created 2 different tables:

 SELECT * FROM tblRequestStatus
id	RequestStatusID
1	  0         
2	  1         
3	  2         
4	  3

 SELECT * FROM tblRequestID
Requestid	RequestStatusID
1	         0         
2	         0         
3	         2         
4	         2         
5	         3

Then, use this query:

select COUNT(r.RequestStatusID) AS Counts,rs.RequestStatusID
from tblRequestStatus rs left join tblRequestID r
on r.RequestStatusID = rs.RequestStatusID
GROUP BY rs.RequestStatusID

to get the result:

Counts RequestStatusID
    2    0
    0    1
    2    2
    1    3