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SELECT Posts.*, 'RDS' AS Service, 'Post' AS Classification
FROM TAGS INNER JOIN PostTags ON PostTags.TagId = Tags.id 
          INNER JOIN Posts ON Posts.Id = PostTags.PostId
WHERE TagName='aws-rds'


UNION

SELECT Posts.*, 'RDS' AS Service, 'Answer' AS Classification
FROM TAGS INNER JOIN PostTags ON PostTags.TagId = Tags.id 
          INNER JOIN Posts ON Posts.ParentId = PostTags.PostId
WHERE TagName='aws-rds'


/*
--UNION NOT POSSIBLE

SELECT *
FROM Comments
WHERE PostId IN (SELECT Posts.Id
FROM TAGS INNER JOIN PostTags ON PostTags.TagId = Tags.id 
    INNER JOIN Posts ON Posts.Id = PostTags.PostId
WHERE TagName='aws-rds'


UNION

SELECT Posts.Id
FROM TAGS INNER JOIN PostTags ON PostTags.TagId = Tags.id 
    INNER JOIN Posts ON Posts.ParentId = PostTags.PostId
    WHERE TagName='aws-rds')

fork query

edited oct 6 22

created oct 5 22 anonymous