動態SQL中變量賦值

在動態SQL語句中進行變量的值綁定比較麻煩，這兒做個記錄

declare @COUNT int,@sql nvarchar(max)
set @sql = 'select @COUNT = count(id) from tbl_sys_dict where root_key = ''WT_TYPE'''
execute sp_executesql @sql, N'@COUNT int output', @COUNT output
print @COUNT