SQL Server在查询之前执行日期转换

Question

I have an application which returns the date in the format: "Thu Sep 22 2016" and I want to query sql server database which has stored the date in the format "2016-09-06". Does SQL server provide any built-in function for conversion (specially the 3 letter month name to number)? Please let me know.

Answer 1

SQL Server has limited date conversion support. These are described in the documentation .

I think this does what you want:

select convert(date, substring(col, 5, 6) + ',' + right(col, 5), 107)

The idea is to convert your string to "Sep 22, 2016" and then use this for the conversion. Assuming your internationalization formats are set to English, then this approach should work.

Answer 2

You can use FORMAT

Example:

DECLARE @d DATETIME = '10/01/2011';  
SELECT FORMAT ( @d, 'd', 'en-US' ) AS 'US English Result'  
      ,FORMAT ( @d, 'd', 'en-gb' ) AS 'Great Britain English Result'  
      ,FORMAT ( @d, 'd', 'de-de' ) AS 'German Result'  
      ,FORMAT ( @d, 'd', 'zh-cn' ) AS 'Simplified Chinese (PRC) Result';   

SELECT FORMAT ( @d, 'D', 'en-US' ) AS 'US English Result'  
      ,FORMAT ( @d, 'D', 'en-gb' ) AS 'Great Britain English Result'  
      ,FORMAT ( @d, 'D', 'de-de' ) AS 'German Result'  
      ,FORMAT ( @d, 'D', 'zh-cn' ) AS 'Chinese (Simplified PRC) Result';  

Answer 3

尝试这个：

SELECT STR_TO_DATE('Sep 22, 2016','%M %d,%Y');

Answer 4

The only thing you have to do is to remove the day of the week part of your string date format. Once that is removed, the string is in a standard date format for SQL Server.

Declare @yourTable table (
    Id int identity(1,1),
    YourDate  datetime2
)

Insert into @yourTable values 
('2016-09-22'),
('2016-09-16'),
('2016-09-22')

Declare @appDate varchar(100) = 'Thu Sep 22 2016'
Set @appDate = ltrim(substring(@appDate,4,len(@appDate)-3))
select * from @yourTable where cast(YourDate as date) = @appDate

I also converted the datetime in the table to date to avoid using the time component of the datetime when querying.