个人学习记录--取表中Name相同的最大值，非Group By，可延伸

DECLARE @t TABLE (name VARCHAR(20),
                  qy VARCHAR(20),
                  je INT);
INSERT INTO @t
SELECT ‘产品一‘,
       ‘北京‘,
       500
UNION ALL
SELECT ‘产品一‘,
       ‘上海‘,
       300
UNION ALL
SELECT ‘产品二‘,
       ‘北京‘,
       600
UNION ALL
SELECT ‘产品三‘,
       ‘上海‘,
       1000
UNION ALL
SELECT ‘产品三‘,
       ‘北京‘,
       8008
UNION ALL
SELECT ‘产品四‘,
       ‘上海‘,
       400;

SELECT *
  FROM @t;

SELECT *
  FROM @t a
 WHERE NOT EXISTS --这是取表中的NAME相同的最大值
 (SELECT 1 FROM @t WHERE name = a.name AND je > a.je);