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 dualUNION ALLSELECT 'A' , 'r' status FROM dualUNION ALLSELECT 'A' , 'd' status FROM dualUNION ALLSELECT 'A' , 'a' status FROM dualUNION ALLSELECT 'A' , 'd' status FROM dualUNION ALLSELECT 'A' , 'u' status FROM dualUNION ALLSELECT 'A' , 'u' status FROM dualUNION ALLSELECT '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)*100from switch_port c group by switch_code