left join and select code example

Example 1: ms sql left join select

SELECT * FROM 
(SELECT [column] FROM [table]) a
LEFT JOIN (SELECT [column1], [columnn2] FROM [table]) b
ON a.column = b.column1

Example 2: ms sql left join select

SELECT * FROM 
(SELECT [UserID] FROM [User]) a
LEFT JOIN (SELECT [TailUser], [Weight] FROM [Edge] WHERE [HeadUser] = 5043) b
ON a.UserId = b.TailUser

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