BITAND SQL - Operation between hexadecimal data Oracle - sql

Question

I need resolve the following situation:
I have the following twelve rows in a table A_5MIN_TST1 (the data to be compared are hexa, but examples works with decimal values):
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
Doing a select I must analyze each bit of the tlq_inst column (hexadecimal data) and decide:
If some value of tlq_inst is
= 8
or
= 32
or
= 128
then write = 8.
When tlq_inst doesn't is 8, 32, 128 then write the first value of tlq_inst, over the range.
I have tried with this query:
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;
And I received these results:
SALIDA
Q
Q
Q
Q
OK
Q
Q
Q
Q
Q
Q
Q
Resuming, on these 12 values, I need to do:
Get 'Q' if the comparison condition with mask is met.
Get the first value of tlq_inst, when the comparison with the mask, is NOT true.
If possible, do the same but inside where
With this query I managed to get 12 values, but I need to get only one.
Could you help me to resolve this problem?
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;

Answer 1

Here is a statement giving you Q when at least one record matches the bitmask and the earliest TLQ_INST otherwise. It uses KEEP DENSE_RANK. It orders the records by utctime, gets the earliest record and returns the tlq_inst of that record. In case there are more records with the same earliest time, it returns the maximum tlq_inst of these records.
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;