尝试使用
CONVERT(datetime,OldDate ,103)
的 “103” 告诉格式是dd/mm/yyyy
编辑
这里就像很多例子了良好的转换器:http://www.sqlusa.com/bestpractices/datetimeconversion/
你似乎有m/d/y以及d/m/y数据,这是你可以做的最好的:
DECLARE @Table1 table (PK int, OldDate nvarchar(255) null)
DECLARE @Table2 table (PK int, NewDate datetime not null)
INSERT @Table1 VALUES (1,'26/07/03')
INSERT @Table1 VALUES (2,null)
INSERT @Table1 VALUES (3,null)
INSERT @Table1 VALUES (4,'23/07/2003')
INSERT @Table1 VALUES (5,'7/26/2003')
INSERT @Table1 VALUES (6,null)
INSERT @Table1 VALUES (7,'28/07/03')
SET DATEFORMAT dmy
INSERT INTO @Table2
(PK, NewDate)
SELECT
PK,
CASE
WHEN ISDATE(OldDate)=1 THEN OldDate
ELSE '1/1/1900'
END
FROM @Table1
SET DATEFORMAT mdy
UPDATE t2
SET NewDate=OldDate
FROM @Table2 t2
INNER JOIN @Table1 t1 ON t2.PK=t1.PK
WHERE t2.NewDate='1/1/1900' AND ISDATE(OldDate)=1
SELECT * FROM @Table2
OUTPUT:
PK NewDate
----------- -----------------------
1 2003-07-26 00:00:00.000
2 1900-01-01 00:00:00.000
3 1900-01-01 00:00:00.000
4 2003-07-23 00:00:00.000
5 2003-07-26 00:00:00.000
6 1900-01-01 00:00:00.000
7 2003-07-28 00:00:00.000
(7 row(s) affected)
我用 '1/1/1900',因为你有NewDate为NOT NULL。
的示例数据应该是: 26/07/03 NULL NULL 23/07/2003 7/26/2003 NULL 28/07/03 – steven 2010-05-06 18:38:16