日期:2014-05-18  浏览次数:20653 次

合并sql语句?
下面有2个sql,很简单:

select   count(*)   from   a
select   count(*)   from   a   where   id   =   1

能不能使用一条语句实现上面的2条语句的功能,即同时查询所有的记录条数和符合某一条件的记录条数?

谢!

------解决方案--------------------
select count(*),sum(case id when 1 then 1 else 0 end) from a
------解决方案--------------------
select count(*) from a
union all
select count(*) from a where id = 1

------解决方案--------------------
select count(*),num = (select count(*) from a where id = 1) from a