SQL：一句话删除重复的数据

--构造原始数据
CREATE TABLE #T(N VARCHAR(10))
--插入数据
INSERT INTO #T  (N)VALUES  ('A')

--方式一：一句话删除重复数据（无主键） 
DELETE t FROM (SELECT *, ROW_NUMBER() OVER(ORDER BY N) AS rownum FROM #t ) AS t WHERE t.rownum > 1 
--方式二：采用CTQ，with的写法删除 
;WITH T AS ( SELECT *, ROW_NUMBER() OVER(ORDER BY N) AS rownum FROM #t ) DELETE FROM T WHERE T.rownum > 1