我需要解决以下问题:
我在表A_5MIN_TST1中有以下12行(要比较的数据是hexa,但示例使用十进制值):
UTCTIME|TLQ_INST
01/08/2013 01:05:00 a.m.|32
01/08/2013 01:10:00 a.m.|128
01/08/2013 01:15:00 a.m.|8
01/08/2013 01:20:00 a.m.|32
01/08/2013 01:25:00 a.m.|1
01/08/2013 01:30:00 a.m.|10
01/08/2013 01:35:00 a.m.|100
01/08/2013 01:40:00 a.m.|1000
01/08/2013 01:45:00 a.m.|2000
01/08/2013 01:50:00 a.m.|3000
01/08/2013 01:55:00 a.m.|4000
做一个选择我必须分析tlq_inst列的每一位(十六进制数据)并决定:
如果tlq_inst的某个值是 = 8 要么 = 32 要么 = 128 然后写= 8。 当tlq_inst不是8,32,128时,则在该范围内写入tlq_inst的第一个值。
我尝试过这个查询:
SELECT DECODE(POWER(2,BITAND(tlq_inst, 168)), 1, 'OK','Q') salida
FROM A_5MIN_TST1
WHERE utctime >= TO_DATE ('01/08/2013 01:00:01','dd/mm/yyyy hh24:mi:ss')
AND utctime < TO_DATE ('01/08/2013 02:00:00','dd/mm/yyyy hh24:mi:ss')
AND POINTNUMBER = 330062;
我收到了这些结果:
SALIDA
Q
Q
Q
Q
OK
Q
Q
Q
Q
Q
Q
Q
恢复,在这12个值上,我需要做:
如果可能的话,在
的内部做同样的事情通过这个查询,我设法获得了12个值,但我只需要一个。
你能帮我解决这个问题吗?
CREATE TABLE A_5MIN_TST1
(
UTCTIME DATE NOT NULL,
POINTNUMBER INTEGER NOT NULL,
SITEID INTEGER,
VALOR_INST FLOAT(126),
TLQ_INST INTEGER,
VALOR_PROM FLOAT(126),
TLQ_PROM INTEGER,
VALOR_MAX FLOAT(126),
TLQ_MAX INTEGER,
UTCTIME_MAX DATE,
VALOR_MIN FLOAT(126),
TLQ_MIN INTEGER,
UTCTIME_MIN DATE
)
TABLESPACE USERS
PCTUSED 0
PCTFREE 10
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
BUFFER_POOL DEFAULT
)
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
ALTER TABLE A_5MIN_TST1 ADD (
PRIMARY KEY
(UTCTIME, POINTNUMBER)
USING INDEX
TABLESPACE USERS
PCTFREE 10
INITRANS 2
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
));
SET DEFINE OFF;
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:05:00', 'MM/DD/YYYY HH24:MI:SS'), 32);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:10:00', 'MM/DD/YYYY HH24:MI:SS'), 128);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:15:00', 'MM/DD/YYYY HH24:MI:SS'), 8);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:20:00', 'MM/DD/YYYY HH24:MI:SS'), 32);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:25:00', 'MM/DD/YYYY HH24:MI:SS'), 1);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:30:00', 'MM/DD/YYYY HH24:MI:SS'), 10);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:35:00', 'MM/DD/YYYY HH24:MI:SS'), 100);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:40:00', 'MM/DD/YYYY HH24:MI:SS'), 1000);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:45:00', 'MM/DD/YYYY HH24:MI:SS'), 2000);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:50:00', 'MM/DD/YYYY HH24:MI:SS'), 3000);
Insert into A_5MIN_TST1
(UTCTIME, TLQ_INST)
Values
(TO_DATE('08/01/2013 01:55:00', 'MM/DD/YYYY HH24:MI:SS'), 4000);
COMMIT;
答案 0 :(得分:0)
这是一个语句,当至少一个记录与位掩码匹配时给你Q,否则给出最早的TLQ_INST。它使用KEEP DENSE_RANK。它通过utctime对记录进行排序,获取最早的记录并返回该记录的tlq_inst。如果有更多记录具有相同的最早时间,则返回这些记录的最大tlq_inst。
select
case when max(bitand(tlq_inst, 168)) = 0 then
max(tlq_inst) keep (dense_rank first order by utctime)
else
'Q'
end as result
from a_5min_tst1
where utctime >= to_date ('01/08/2013 01:00:01','dd/mm/yyyy hh24:mi:ss')
and utctime < to_date ('01/08/2013 02:00:00','dd/mm/yyyy hh24:mi:ss')
and pointnumber = 330062;