instruction: Compare post counts for 2 tags.
response: SELECT COUNT(PostId) AS c, TagName FROM Tags, PostTags, Posts WHERE Tags.Id = PostTags.TagId AND Posts.Id = PostId AND Posts.CreationDate < '2017-01-01' AND Posts.CreationDate > '2016-01-01' AND TagName IN ('4d', 'java', 'c#', 'php', 'cobol', 'ms-access', '4d-database') GROUP BY TagName