sql 如何将拼的sql语句结果赋值给变量

SET @SQLS='select @AllUser=count(1) from (select PhoneId from '+@TABLE+' where SiteId='+convert(VARCHAR(5),@SiteId)+' AND PhoneId<>'''' AND CONVERT(varchar(10), CreateTime, 120)='''+@time+''' group BY PhoneId) tb'
exec sp_executesql @SQLS,N'@AllUser int out',@AllUser out
SET @SQLS='select @AllUser=count(1) from (s