求大神帮我看下执行后into报错原因

declare strSql varchar(2000);software VARCHAR(50);
begin
set strSql:='
	declare a varchar(100);
	begin 
		set a=''腾讯QQ''; 
		select a;
	end;
	';
	--select strSql;
	--EXECUTE IMMEDIATE strSql;   -- 这句执行正常
	EXECUTE IMMEDIATE strSql INTO software;  -- 报错 无效的EXECUTE语句
end;