跟日期有关的两条经典SQL语句
2006-12-17 07:41:10
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跟gen日ri期qi有you关guan的de两liang条tiao经jing典dianSQL语yu句ju 跟gen日ri期qi有you关guan的de两liang条tiao经jing典dianSQL语yu句ju 1.用yong一yi条tiao语yu句ju得de出chu某mou日ri期qi所suo在zai月yue份fen的de最zui大da天tian数shu？SELECT DAY(DATEADD(dd, -DAY('2004-02-13'), DATEADD(mm, 1, '2004-02-13'))) AS 'Day Number' 2.少shao记ji录lu变bian成cheng多duo条tiao记ji录lu问wen题ti 有you表biaotbl 日ri期qi 收shou入ru 支zhi出chu 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 40 /* 测ce试shi数shu据ju： Create Table tbl([日ri期qi] smalldatetime,[收shou入ru] int ,[支zhi出chu] 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 */ 要yao得de到dao的de结jie果guo： 日ri期qi 收shou入ru 支zhi出chu 余yu额e 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 2004-03-18 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 30 答da案an： SELECT Y.[日ri期qi], tbl.[收shou入ru], tbl.[支zhi出chu], ( SELECT SUM(ISNULL(tbl.[收shou入ru], 0)-ISNULL(tbl.[支zhi出chu], 0)) FROM tbl WHERE [日ri期qi]<=Y.[日ri期qi]) AS [余yu额e] FROM tbl RIGHT JOIN ( SELECT DATEADD(dd, N.i, DATEADD(dd, 1-DAY(m.MinDay), m.MinDay)) AS [日ri期qi] FROM ( SELECT 0 AS i 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 UNION ALL SELECT 19 UNION ALL SELECT 20 UNION ALL SELECT 21 UNION ALL SELECT 22 UNION ALL SELECT 23 UNION ALL SELECT 24 UNION ALL SELECT 25 UNION ALL SELECT 26 UNION ALL SELECT 27 UNION ALL SELECT 28 UNION ALL SELECT 29 UNION ALL SELECT 30 UNION ALL SELECT 31 ) N, ( SELECT MIN(日ri期qi) AS MinDay FROM tbl GROUP BY DATEDIFF(month, 0, 日ri期qi) ) M WHERE DATEDIFF(mm, DATEADD(dd, N.i, DATEADD(dd, 1-DAY(m.MinDay), m.MinDay)), M.MinDay)=0) AS Y ON tbl.[日ri期qi]=Y.日ri期qi【
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跟日期有关的两条经典SQL语句
跟日期有关的两条经典SQL语句 1.用一条语句得出某日期所在月份的最大天数？ SELECT DAY(DATEADD(dd, -DAY('2004-02-13'), DATEADD(mm, 1, '2004-02-13'))) AS 'Day Number'
2.少记录变成多条记录问题
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 40
/*
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
*/
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
2004-03-18 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 30
答案：
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
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
UNION ALL SELECT 19
UNION ALL SELECT 20
UNION ALL SELECT 21
UNION ALL SELECT 22
UNION ALL SELECT 23
UNION ALL SELECT 24
UNION ALL SELECT 25
UNION ALL SELECT 26
UNION ALL SELECT 27
UNION ALL SELECT 28
UNION ALL SELECT 29
UNION ALL SELECT 30
UNION ALL SELECT 31
) N,
(
SELECT MIN(日期) AS MinDay
FROM tbl
GROUP BY DATEDIFF(month, 0, 日期)
) M
WHERE DATEDIFF(mm, DATEADD(dd, N.i, DATEADD(dd, 1-DAY(m.MinDay), m.MinDay)), M.MinDay)=0) AS Y
ON tbl.[日期]=Y.日期
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