sql server在变量中存储select的结果？

Question

我正在做一个功能.select语句只返回一行,包含一列,比如说int.我如何将这个int存储在声明的变量中,以便我的函数可以返回变量？

select sum(table_name.col1) -- this line returns only one int. How to store that
--in a declared variable ? 
from
(select 
col1, col2
--code here
)table_name

Answer 1

DECLARE @Varname int
SELECT @Varname = SUM(table_name.col1) FROM etc
SELECT @Varname