过滤 SQL 结果

Question

I have the following query written

SELECT *
FROM 
    (((SocialAndTags 
JOIN 
    SocialManagementTracker ON SocialAndTags.SMTrackerID = SocialManagementTracker.SocialID)
JOIN 
    ProgramCategories ON SocialAndTags.ProgramCategoriesID = ProgramCategories.ProgramID)
JOIN 
    TagCategories ON SocialAndTags.TagCategoriesID = TagCategories.TagID) 
WHERE 
    InitialComment > '2020-03-16 00:00:00.999' 
    AND InitialComment < '2020-03-17 23:59:59.999'
ORDER BY 
    SMTrackerID DESC 

This executes no problem.

Here is my issue. I have 3 tables. TagCategories tables holds the ID/Tag Name. SocialManagementTracker holds the Item and more details. SocialAndTags table has a unique ad and is pulling the TagCategories and SocialManagementTracker unique IDs.

When users are entering multiple tags for an item, its appearing the in the SocialAndTags table twice, which is how I set it up. How do I then use the above query to filer out the duplicate item results?

Or did I do this backwards and I should have added another column(s) to my SocialAndTags table?

Answer 1

I've reviewed my database and found I was referencing the wrong foreign key. I also used DISTINCT to get the results I required.

SELECT 
DISTINCT
SocialID, ProgramArea, Description, SocialURL, InitialComment, DaysToResolve, ResolutionDate FROM 
SocialAndTags 
JOIN SocialManagementTracker ON SocialAndTags.SMTrackerID = SocialManagementTracker.SocialID
JOIN ProgramCategories ON SocialAndTags.ProgramCategoriesID = ProgramCategories.ProgramID
WHERE 
InitialComment > '2020-03-16 00:00:00.999' 
AND InitialComment < '2020-03-17 23:59:59.999'
ORDER BY ResolutionDate, InitialComment DESC