3 Count functions returning the same value - sql

Question

So i have this query:
SELECT Posts.[Post ID], Count(Comments.[Comment ID]) AS [CountOfComment ID],
Count(Shares.[Share ID]) AS [CountOfShare ID],
Count(Likes.[Like ID]) AS [CountOfLike ID]
FROM ((Posts INNER JOIN Likes ON Posts.[Post ID] = Likes.[Post ID])
INNER JOIN Shares ON Posts.[Post ID] = Shares.[Post ID])
INNER JOIN Comments ON Posts.[Post ID] = Comments.[Post ID]
WHERE posts.[post id] = 5
GROUP BY Posts.[Post ID];
Which should return the results:
post.[post id]= 5
CountofcommentID= 4
CountofShareID = 5
CountofLikeID = 15
But instead i get post.[post id] = 5, and the rest =300.
I know that this is because it is counting up all the permutations of all the IDs, but how do i change that to get the results that i want?

Answer 1

You are misunderstanding what COUNT() does. It counts the number of non-NULL values. The proper solution is to use COUNT(DISTINCT). Because MS-Access does not support COUNT(DISTINCT) you might interpret that as "get a functional database".
Inside MS Access, you can do this using subqueries of some type. Here is one method:
SELECT p.[Post ID],
(SELECT COUNT(*)
FROM (SELECT DISTINCT [Post Id], [Comment ID]
FROM Comments as c
) as c
WHERE c.[Post Id] = p.[Post Id]
) as [CountOfComment ID],
(SELECT COUNT(*)
FROM (SELECT DISTINCT [Post Id], [Share ID]
FROM Shares as s
) as s
WHERE s.[Post Id] = p.[Post Id]
) as [CountOfShare ID],
(SELECT COUNT(*)
FROM (SELECT DISTINCT [Post Id], [Like ID]
FROM Likes as l
) as l
WHERE l.[Post Id] = p.[Post Id]
) as [CountOfLikes ID]
FROM Posts as p
WHERE p.[post id] = 5
GROUP BY p.[Post ID];

Answer 2

When you join, you get a row for every combination. Therefore, count does count every row, which has value different from null. So, what you want is to count DISTINCT ids. I.e.:
SELECT Posts.[Post ID], Count(DISTINCT Comments.[Comment ID]) AS [CountOfComment ID],
Count(DISTINCT Shares.[Share ID]) AS [CountOfShare ID],
Count(DISTINCT Likes.[Like ID]) AS [CountOfLike ID]
FROM ((Posts INNER JOIN Likes ON Posts.[Post ID] = Likes.[Post ID])
INNER JOIN Shares ON Posts.[Post ID] = Shares.[Post ID])
INNER JOIN Comments ON Posts.[Post ID] = Comments.[Post ID]
WHERE posts.[post id] = 5
GROUP BY Posts.[Post ID];
If the system does not support this syntax, you might need to do subqueries:
Select Posts.[Post ID],
(Select count([Share ID]) from Shares where Posts.[Post ID] = Shares.[Post ID]) as SharesCount
FROM Posts
WHERE posts.[post id] = 5;