如何设置datepart设置sql开始日期和结束日期

Question

我有一个问题如何设置我想要的日期部分确切日期：她的例子代码：

SET DATEFIRST 7;
select CAST(DATEPART(wk, '01/03/2010') AS CHAR(4)).. // 01/01/2010 to 01/03/2010 to return 1

我如何设置datepart如果01/03/2010到01/09/2010返回= 1并且01/10/2010到01/16/2010返回到2 ..最多53周..

Answer 1

从datepart中减去一个：

SET DATEFIRST 7;
select CAST(DATEPART(wk, '01/03/2010') - 1 AS CHAR(4))
select CAST(DATEPART(wk, '01/09/2010') - 1 AS CHAR(4))
select CAST(DATEPART(wk, '01/10/2010') - 1 AS CHAR(4))
select CAST(DATEPART(wk, '01/16/2010') - 1 AS CHAR(4))

结果：

1
1
2
2