寻找SQL Server查询优化

Question

我有这个查询在SQL Server中运行速度非常慢。请建议优化它以加快运行速度。

• TABLE_A具有100'000'000行
• TABLE_B具有1'000'000行

两个表对ID，Modify_Date和Source列非聚集索引。

查询：

Insert into TABLE_A  
    select * from RABLE_B B 
    Where NOT Exists (Select 1 
        From TABLE_A A 
        Where B.ID = A.ID 
         And B.Modify_Date = A.Modify_Date 
         And B.Source = A.Source) 

Answer 1

INSERT INTO TABLE_A 
     SELECT B.* 
     FROM TABLE_B B 
       LEFT JOIN TABLE_A A ON B.ID = A.ID 
            AND B.Modify_Date = A.Modify_Date 
            AND B.Source = A.Source 
     WHERE A.ID IS NULL