根据几个条件查询表的条数解决方案

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？

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

贴建表及插入记录的SQL，及要求结果出来看看

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……

引用1：总数

2：hoststatus =0,hoststatus =1，hoststatus =2的时候得出条数

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>



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

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