日期:2014-05-17  浏览次数:20875 次

求使用率,sql语句。
switch单独一个表,有switch_code
switch_port单独一个表,有switch_code,switch_port_code,status.(status有:U(in use),R,D,A四种情况)
如何求出每个switch中port口占用率?

------解决方案--------------------
SQL code
WITH t AS 
(
SELECT 'A' switch_code, 'u' status FROM dual
UNION ALL
SELECT 'A' , 'r' status FROM dual
UNION ALL
SELECT 'A' , 'd' status FROM dual
UNION ALL
SELECT 'A' , 'a' status FROM dual
UNION ALL
SELECT 'A' , 'd' status FROM dual
UNION ALL
SELECT 'A' , 'u' status FROM dual
UNION ALL
SELECT 'A' , 'u' status FROM dual
UNION ALL
SELECT 'A' , 'u' status FROM dual
)

SELECT switch_code,
       SUM(decode(status,'u',1,0))/COUNT(switch_code) u占有率,
       SUM(decode(status,'a',1,0))/COUNT(switch_code) a占有率,
       SUM(decode(status,'d',1,0))/COUNT(switch_code) d占有率,
       SUM(decode(status,'r',1,0))/COUNT(switch_code) r占有率
       FROM t
       GROUP BY switch_code

--result:
A    0.5    0.125    0.25    0.125

------解决方案--------------------
SQL code
select sum(decode(status,'U',1,0))/count(1)*100
from switch_port c 
group by switch_code