在 SQL Server 中分别从给定的月、日和年获取工作日名称
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Get week day name from a given month, day and year individually in SQL Server
提问by theITvideos
I am trying get a day name like friday, saturday, sunday, monday etc from a given date. I know there is a built in function which returns the day name for example:
我正在尝试从给定日期获取一个日期名称,如星期五、星期六、星期日、星期一等。我知道有一个内置函数可以返回日期名称,例如:
SELECT DATENAME(dw,'09/23/2013') as theDayName
this SQL query returns:
此 SQL 查询返回:
'Monday'
'周一'
This is all OK. But I would like to pass Month, Day and Year
individually.
这一切都可以。但我想Month, Day and Year
单独通过。
I am using the builtin DATEPART function to retrieve month, day and year from a date so I can pass it to the DATENAME function:
我使用内置的 DATEPART 函数从日期中检索月、日和年,以便我可以将它传递给 DATENAME 函数:
SELECT DATEPART(m, GETDATE()) as theMonth -- returns 11
SELECT DATEPART(d, GETDATE()) as theDay -- returns 20
SELECT DATEPART(yy, GETDATE()) as theYear -- returns 2013
Now that I have Month, Day, Year values individually, I pass it to my DATENAME
to get the Weekname
of the date I want:
现在我分别有 Month、Day、Year 值,我将它传递给 myDATENAME
以获得Weekname
我想要的日期:
--my SQL query to return dayName
SELECT (DATENAME(dw, DATEPART(m, GETDATE())/DATEPART(d, myDateCol1)/ DATEPART(yy, getdate()))) as myNameOfDay, FirstName, LastName FROM myTable
This returns an incorrect Day Name. I tried replace / with - so that in the DATENAME function my SQL query becomes:
这将返回不正确的日期名称。我尝试用 - 替换 / 以便在 DATENAME 函数中我的 SQL 查询变为:
SELECT DATENAME(dw,'09/23/2013')
--becomes
SELECT DATENAME(dw,'09-23-2013')
but it still returns incorrect dayName from my SQL query. Am I missing something here.
但它仍然从我的 SQL 查询中返回不正确的 dayName。我在这里错过了什么。
Please advise.
请指教。
采纳答案by Eli Gassert
You need to construct a date string. You're using /
or -
operators which do MATH/numeric operations on the numeric return values of DATEPART. Then DATENAME
is taking that numeric value and interpreting it as a date.
您需要构造一个日期字符串。您正在使用/
或-
运算符对 DATEPART 的数字返回值执行数学/数字运算。然后DATENAME
取该数值并将其解释为日期。
You need to convert it to a string. For example:
您需要将其转换为字符串。例如:
SELECT (
DATENAME(dw,
CAST(DATEPART(m, GETDATE()) AS VARCHAR)
+ '/'
+ CAST(DATEPART(d, myDateCol1) AS VARCHAR)
+ '/'
+ CAST(DATEPART(yy, getdate()) AS VARCHAR))
)
回答by Irfan Raza
Tested and works on SQL 2005 and 2008. Not sure if this works in 2012 and later.
在 SQL 2005 和 2008 上测试和工作。不确定这是否在 2012 年及以后工作。
The solution uses DATENAME instead of DATEPART
解决方案使用 DATENAME 而不是 DATEPART
select datename(dw,getdate()) --Thursday
select datepart(dw,getdate()) --2
This is work in sql 2014 also.
这也是 sql 2014 中的工作。
回答by Greenstone Walker
If you have SQL Server 2012:
如果您有 SQL Server 2012:
If your date parts are integers then you can use DATEFROMPARTS
function.
如果您的日期部分是整数,那么您可以使用DATEFROMPARTS
函数。
SELECT DATENAME( dw, DATEFROMPARTS( @Year, @Month, @Day ) )
If your date parts are strings, then you can use the CONCAT
function.
如果您的日期部分是字符串,那么您可以使用该CONCAT
函数。
SELECT DATENAME( dw, CONVERT( date, CONCAT( @Day, '/' , @Month, '/', @Year ), 103 ) )
回答by Praveen Patel G
Try like this: select DATENAME(DW,GETDATE())
像这样尝试: select DATENAME(DW,GETDATE())
回答by Chandra Sekhar Reddy Ginuga
SELECT DATENAME(DW,CONVERT(VARCHAR(20),GETDATE(),101))
回答by Leo Fazzi
I used
我用了
select
case
when (extract (weekday from DATE)=0) then 'Sunday'
and so on...
等等...
0 Sunday, 1 Monday...
0个星期日,1个星期一...