日期:2014-05-16  浏览次数:20891 次

根据几个条件 查询表的条数
一张表: t_topoobject 
字段: id,name,location,status


我现在要查询:
条件1:t_topoobject 的总数
条件2:根据status(int类型)判断来查询条数(多个条件,如:status=0,status=1,status=2)


ps:
如果我还有一张表,跟上面一样。 2张表可以一起查询不?

------解决方案--------------------
select count(*),sum(if(status=0,1,0)), sum(if(status=1,1,0)), ... from tt


如果我还有一张表,跟上面一样。 2张表可以一起查询不?
详细说明,是否有关系,直接UNION ALL不行?
select count(*),sum(if(status=0,1,0)), sum(if(status=1,1,0)), ... from 

(select * from tt1 union all select * from tt2) a
------解决方案--------------------
贴建表及插入记录的SQL,及要求结果出来看看
------解决方案--------------------
探讨

引用:

select count(*),sum(if(status=0,1,0)), sum(if(status=1,1,0)), ... from tt


如果我还有一张表,跟上面一样。 2张表可以一起查询不?
详细说明,是否有关系,直接UNION ALL不行?
select count(*),sum(if(status=0,1,0)), s……

------解决方案--------------------
引用1: 总数
2:hoststatus =0,hoststatus =1,hoststatus =2的时候得出条数

------解决方案--------------------
SQL code
mysql> SELECT * FROM `ti_host` ;
+------+--------+----------+------------+---------+--------------+------------+
-----------------+--------+--------+-----------+--------------+----------+-----
---------+-------------------+--------------+------------------+---------------
-+----------------+
| MOID | HOSTSN | HOSTNAME | CPUCORENUM | CPUDESC | CPUFREQUENCY | HOSTSTATUS |
MANAGEDIPADDRESS | MEMORY | OS     | OSVERSION | AGENTVERSION | HOSTTYPE | TOTA
CAPACITY | TOTALCAPACITYUNIT | USEDCAPACITY | USEDCAPACITYUNIT | phisicalMemSiz
 | virtualMemSize |
+------+--------+----------+------------+---------+--------------+------------+
-----------------+--------+--------+-----------+--------------+----------+-----
---------+-------------------+--------------+------------------+---------------
-+----------------+
|    1 | 234    | 234      |        234 | 234     | 234          |          1 |
10.27.81.131     | 324    | 234234 | 1         | 234          |   234234 | 2342
4        | 234               | 234          | 234              | 234
 | 234            |
|    2 | 234    | 234      |        234 | 23      | 423          |          0 |
10.27.81.131     | 345    | 345    | 1         | 345          |      234 | 234
         | 234234            | 2342         | 23423            | 424
 | 234            |
+------+--------+----------+------------+---------+--------------+------------+
-----------------+--------+--------+-----------+--------------+----------+-----
---------+-------------------+--------------+------------------+---------------
-+----------------+
2 rows in set (0.00 sec)

mysql> SELECT COUNT(*),SUM(IF(hoststatus=0,1,0)), SUM(IF(hoststatus=1,1,0)),
    -> SUM(IF(hoststatus=2,1,0))
    ->  FROM `ti_host`;
+----------+---------------------------+---------------------------+-----------
---------------+
| COUNT(*) | SUM(IF(hoststatus=0,1,0)) | SUM(IF(hoststatus=1,1,0)) | SUM(IF(hos
status=2,1,0)) |
+----------+---------------------------+---------------------------+-----------
---------------+
|        2 |                         1 |                         1 |
             0 |
+----------+---------------------------+---------------------------+-----------
---------------+
1 row in set (0.00 sec)

mysql>

------解决方案--------------------
SQL code
mysql> select * from ti_host;
+------+--------+----------+------------+---------+--------------+------------+------------------+--------+--------+-----------+--------------+----------+---------------+-------------------+--------------+------------------+-----------------+----------------+
| MOID | HOSTSN