I have two SELECT statements in SQL Server like these:
(SELECT [UserID] FROM [User]) (SELECT [TailUser], [Weight] FROM [Edge] WHERE [HeadUser] = 5043)
I want to perform a LEFT JOIN between these two SELECT statements on [UserID] attribute and [TailUser] attribute. I want to join existent records in second query with the corresponding records in first query and NULL value for absent records. How can I do this?
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Answer
SELECT * FROM (SELECT [UserID] FROM [User]) a LEFT JOIN (SELECT [TailUser], [Weight] FROM [Edge] WHERE [HeadUser] = 5043) b ON a.UserId = b.TailUser