集團由週日期和月份

Question

如何通過月份和星期組數據

我知道這是不對的..

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

where子句不能內按... 但這種使用是想我需要

Answer 1

你可能想

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

從SELECT (Transact-SQL)

[WITH common_table_expression]

SELECT select_list中[INTO NEW_TABLE]

[FROM table_source] [WHERE search_condition]

[GROUP BY group_by_expression]

[HAVING search_condition]

[ORDER BY order_expression [ASC | DESC]]

Answer 2

把where子句group by前：

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