INNER JOIN条件和WHERE CLAUSE条件之间的性能差异

Question

我在以下两个条件中查询了哪种情况执行

SELECT EXISTS(SELECT * FROM USER WHERE UserID = 20070022)

Scenario 1

INNER JOIN [BigTable] b ON a.[BigTableID] = b.[BigTableID] AND b.[Condition] IN ('A','B','C')

Scenario 2