按工作日和月分組

Question

如何按月和周計分數據

我知道這是錯的..

select sum(x) from demo_table 
group by DATEPART(month,date) 
where DATENAME(weekday,date)='sunday' ;

where子句不能在組內使用...但這是我想要的

Answer 1

將where子句放在group by之前：

select sum(x)
from demo_table
where DATENAME(weekday,date)='sunday'
group by DATEPART(month,date)  ;

Answer 2

你可能想要

select  sum(x) 
from    demo_table 
where   DATENAME(weekday,date)='sunday'
group by DATEPART(month,date) 

來自SELECT（Transact-SQL）

[WITH common_table_expression]

SELECT select_list [INTO new_table]

[FROM table_source] [WHERE search_condition]

[GROUP BY group_by_expression]

[HAVING search_condition]

[ORDER BY order_expression [ASC | DESC]]