求教一个视图的写法
有如下一张数据表:
create table cfg_callerrule_info
(
policy_id varchar(32), --策略ID
rule_type smallint,
--1主叫挂断次数,2主叫接通率
time_slice smallint, --时间片,单位为分钟,判断该时间段内,操作的情况
threshold varchar(20), --违规发送频率阈值(对于主叫接通率,为百分数)
relation smallint, --1:与,0:或,主叫挂断次数和主叫连通率的关系
primary key (policy_id,rule_type)
);
目前需要定义一个视图,需求如下:
(1)既有主叫挂断次数,又有主叫接通率的规则
policy_id PN036201207181328000315
rule_type
1
time_slice 10
threshold 10
relation 1
policy_id PN036201207181328000315
rule_type
2
time_slice 20
threshold 20
relation 1
得到:
policy_id, PN036201207181328000315
hang_up_time_slice 10
hang_up_threshold 10
conn_time_slice 20
conn_threshold 20
relation 1
(2)只有主叫挂断次数、主叫接通率之一的策略
..
policy_id PN036201207131503570103
rule_type
1
time_slice 22
threshold 22
relation 1
得到:
policy_id, PN036201207131503570103
hang_up_time_slice 22
hang_up_threshold 22
conn_time_slice
conn_threshold
relation
..
policy_id PN036201207181328000309
rule_type
2
time_slice 100
threshold 100
relation 1
得到
policy_id, PN036201207131503570103
hang_up_time_slice
hang_up_threshold
conn_time_slice 100
conn_threshold 100
relation
现在写出来的视图只能满足(1),修改多次也没有达到(1)(2)都满足,
满足(1)的视图的写法:
CREATE VIEW v_cfg_callerrule_info(policy_id,hang_up_time_slice,hang_up_threshold,conn_time_slice,conn_threshold,relation)
AS
SELECT c1.policy_id,c1.time_slice,c1.threshold,c2.time_slice,c2.threshold,
CASE
WHEN(c1.relation IS NOT NULL) THEN c1.relation
WHEN(c2.relation IS NOT NULL) THEN c2.relation
ELSE NULL
END
from cfg_callerrule_info c1,cfg_callerrule_info c2
where c1.policy_id = c2.policy_id and c1.rule_type < c2.rule_type
这个问题已经纠结了很久了,请各位不吝赐教!
------解决方案--------------------create view xxx as
with
&nb