SQL Server 2008 R2 Update語句log

        CREATE TABLE #test
            (
              id INT NULL ,
              age INT NULL ,
              refed INT NULL
            );
        
        CREATE TABLE #loves
            (
              id INT NULL ,
              favitem VARCHAR(50) NULL
            );
        
        INSERT  INTO #test
                ( id, age )
        VALUES  ( 0, -- id - int
                  45  -- age - int
                  )
        INSERT  INTO #test
                ( id, age )
        VALUES  ( 1, -- id - int
                  16  -- age - int
                  )
        INSERT  INTO #test
                ( id, age )
        VALUES  ( 2, -- id - int
                  23  -- age - int
                  )
                  
        INSERT  INTO #test
                ( id, age )
        VALUES  ( 3, -- id - int
                  31  -- age - int
                  )
                  
        INSERT  INTO #loves
                ( id, favitem )
        VALUES  ( 0, -- id - int
                  'ice cream'  -- favitem - varchar(50)
                  );

        INSERT  INTO #loves
                ( id, favitem )
        VALUES  ( 2, -- id - int
                  'juice'  -- favitem - varchar(50)
                  );

        INSERT  INTO #loves
                ( id, favitem )
        VALUES  ( 3, -- id - int
                  'ice tea'  -- favitem - varchar(50)
                  );

        SELECT  'before';

        SELECT  *
        FROM    #test

        UPDATE  #test
        SET     refed = LEN(#loves.favitem)
        FROM    #test
                INNER JOIN #loves ON #loves.id = #test.id

        SELECT  'after';

        SELECT  *
        FROM    #test;

        DROP TABLE #loves;
        DROP TABLE #test;