sql 返回 第幾周

--孕婦預產期 週數

/****** 物件:  userdefinedfunction [dbo].[f_crm_getedcweek]    指令碼日期: 07/27/2020 17:24:52 ******/
set ansi_nulls on
goset quoted_identifier on
goalter function [dbo].[f_crm_getedcweek](@edc datetime)
returns int
asbegin
declare @edcweek int,@today datetime,@ledc datetime
set @edcweek = 0
set @today = convert(char(10),getdate(),126)
if @edc >= @today
begin
set @ledc = @edc - 280;
set @edcweek =   abs(datediff(day,@today,@ledc)  / 7);
endreturn @edcweek
end

----返回星期名字

alter function [dbo].[f_pre_getweekname](@date datetime,@weekname varchar(10) = '',@flag int = 0)
returns varchar(10)
asbegin
declare @weekid int
declare @myweekname varchar(10)
if @flag = 0
begin
set @weekid = datepart(w,@date);
if @weekid = 7 set @myweekname = '星期六'
else if @weekid = 1 set @myweekname = '星期天'
else if @weekid = 2 set @myweekname = '星期一'
else if @weekid = 3 set @myweekname = '星期二'
else if @weekid = 4 set @myweekname = '星期三'
else if @weekid = 5 set @myweekname = '星期四'
else if @weekid = 6 set @myweekname = '星期五'
endelse if @flag = 1
begin
if @weekname = '星期六' set @weekid = 7
else if @weekname = '星期天' set @weekid = 1
else if @weekname = '星期一' set @weekid = 2
else if @weekname = '星期二' set @weekid = 3
else if @weekname = '星期三' set @weekid = 4
else if @weekname = '星期四' set @weekid = 5
else if @weekname = '星期五' set @weekid = 6
end 
if @flag = 1 set @myweekname = cast(@weekid as varchar(10))
return @myweekname
end

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