跟日期有关的两条经典SQL语句

2008-04-02 10:40:36来源:互联网 阅读 ()

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1.用一条语句得出某日期所在月份的最大天数?www.come on babychinai tp ow er.com92r725v


  SELECT DAY(DATEADD(dd, -DAY(''2004-02-13''), DATEADD(mm, 1, ''2004-02-13''))) AS ''Day Number''www.come on babychinai tp ow er.com92r725v


  2.少记录变成多条记录问题www.come on babychinai tp ow er.com92r725v


  有表tbl
  日期 收入 支出
  2004-02-11 00:00:00 60 45
  2004-03-01 00:00:00 60 45
  2004-03-02 00:00:00 40 50
  2004-03-05 00:00:00 50 40www.come on babychinai tp ow er.com92r725v


www.come on babychinai tp ow er.com92r725v



  /*
  测试数据:
  Create Table tbl([日期] smalldatetime,[收入] int ,[支出] int)
  Insert Into tbl
  SELECT ''2004-02-11'', 60, 45
  union SELECT ''2004-03-01'',60, 45
  union SELECT ''2004-03-02'',40, 50
  union SELECT ''2004-03-05'',50, 40
  */
www.come on babychinai tp ow er.com92r725v



  要得到的结果:
  日期 收入 支出 余额
  2004-02-01 00:00:00 NULL NULL NULL
  2004-02-02 00:00:00 NULL NULL NULL
  2004-02-03 00:00:00 NULL NULL NULL
  2004-02-04 00:00:00 NULL NULL NULL
  2004-02-05 00:00:00 NULL NULL NULL
  2004-02-06 00:00:00 NULL NULL NULL
  2004-02-07 00:00:00 NULL NULL NULL
  2004-02-08 00:00:00 NULL NULL NULL
  2004-02-09 00:00:00 NULL NULL NULL
  2004-02-10 00:00:00 NULL NULL NULL
  2004-02-11 00:00:00 60 45 15
  2004-02-12 00:00:00 NULL NULL 15
  2004-02-13 00:00:00 NULL NULL 15
  2004-02-14 00:00:00 NULL NULL 15
  2004-02-15 00:00:00 NULL NULL 15
  2004-02-16 00:00:00 NULL NULL 15
  2004-02-17 00:00:00 NULL NULL 15
  2004-02-18 00:00:00 NULL NULL 15
  2004-02-19 00:00:00 NULL NULL 15
  2004-02-20 00:00:00 NULL NULL 15
  2004-02-21 00:00:00 NULL NULL 15
  2004-02-22 00:00:00 NULL NULL 15
  2004-02-23 00:00:00 NULL NULL 15
  2004-02-24 00:00:00 NULL NULL 15
  2004-02-25 00:00:00 NULL NULL 15
  2004-02-26 00:00:00 NULL NULL 15
  2004-02-27 00:00:00 NULL NULL 15
  2004-02-28 00:00:00 NULL NULL 15
  2004-02-29 00:00:00 NULL NULL 15
  2004-03-01 00:00:00 60 45 30
  2004-03-02 00:00:00 40 50 20
  2004-03-03 00:00:00 NULL NULL 20
  2004-03-04 00:00:00 NULL NULL 20
  2004-03-05 00:00:00 50 40 30
  2004-03-06 00:00:00 NULL NULL 30
  2004-03-07 00:00:00 NULL NULL 30
  2004-03-08 00:00:00 NULL NULL 30
  2004-03-09 00:00:00 NULL NULL 30
  2004-03-10 00:00:00 NULL NULL 30
  2004-03-11 00:00:00 NULL NULL 30
  2004-03-12 00:00:00 NULL NULL 30
  2004-03-13 00:00:00 NULL NULL 30
  2004-03-14 00:00:00 NULL NULL 30
  2004-03-15 00:00:00 NULL NULL 30
  2004-03-16 00:00:00 NULL NULL 30
  2004-03-17 00:00:00 NULL NULL 30
 ?004-03-18 00:00:00 NULL NULL 30
  2004-03-19 00:00:00 NULL NULL 30
  2004-03-20 00:00:00 NULL NULL 30
  2004-03-21 00:00:00 NULL NULL 30
  2004-03-22 00:00:00 NULL NULL 30
  2004-03-23 00:00:00 NULL NULL 30
  2004-03-24 00:00:00 NULL NULL 30
  2004-03-25 00:00:00 NULL NULL 30
  2004-03-26 00:00:00 NULL NULL 30
  2004-03-27 00:00:00 NULL NULL 30
  2004-03-28 00:00:00 NULL NULL 30
  2004-03-29 00:00:00 NULL NULL 30
  2004-03-30 00:00:00 NULL NULL 30
  2004-03-31 00:00:00 NULL NULL 30www.come on babychinai tp ow er.com92r725v


www.come on babychinai tp ow er.com92r725v




www.come on babychinai tp ow er.com92r725v



  答案:www.come on babychinai tp ow er.com92r725v


  SELECT Y.[日期], tbl.[收入], tbl.[支出], (
  SELECT SUM(ISNULL(tbl.[收入], 0)-ISNULL(tbl.[支出], 0)) FROM tbl WHERE [日期]<=Y.[日期]) AS [余额]
  FROM tbl RIGHT JOIN (
  SELECT DATEADD(dd, N.i, DATEADD(dd, 1-DAY(m.MinDay), m.MinDay)) AS [日期]
  FROM (
  SELECT 0 AS i www.come on babychinai tp ow er.com92r725v


  UNION ALL SELECT 1
  UNION ALL SELECT 2
  UNION ALL SELECT 3
  UNION ALL SELECT 4
  UNION ALL SELECT 5
  UNION ALL SELECT 6
  UNION ALL SELECT 7
  UNION ALL SELECT 8
  UNION ALL SELECT 9
  UNION ALL SELECT 10
  UNION ALL SELECT 11
  UNION ALL SELECT 12
  UNION ALL SELECT 13
  UNION ALL SELECT 14
  UNION ALL SELECT 15
  UNION ALL SELECT 16
  UNION ALL SELECT 17
  UNION ALL SELECT 18

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