Counties of simple order of magnitude... do exist?
Normally I don't deal with SQL, so apologies if I'm asking is dumb / obvious.I have a [orders] table with about 300 000 000 lines. It is quite large (approx. 500 b on avg).
There is a unique index [idx_a] on [order_id, order_dt, store_chain, store_id]
There is another index [idx_b] on [order_dt,.. .several other columns...]
At a high level, I want to do something like:
SELECT TO_CHAR (order_dt, "YYYY"), COUNT (*)
Orders
GROUP BY order_dt
But I'm not really interested in the exact number, I'm more interested in an order of magnitude summary. The system is online and direct and has constantly arrested since the different points of sale (about 20 per minute). I tried in an environment of running the above query test, but he does not terminate within 15 minutes.
Is there a smarter way to do this?
Howler_Fish wrote:
At a high level, I want to do something like:SELECT TO_CHAR (order_dt, "YYYY"), COUNT (*)
Orders
GROUP BY order_dtBut I'm not really interested in the exact number, I'm more interested in an order of magnitude summary. The system is online and direct and has constantly arrested since the different points of sale (about 20 per minute). I tried in an environment of running the above query test, but he does not terminate within 15 minutes.
Is there a smarter way to do this?
Apart from the other advice you have already, you can try to use "sampling" If you are really interesting just a "rough": estimate
SELECT TO_CHAR (order_dt, "YYYY"), COUNT ()) * 10, according to the NTC
Examples of controls (10)
GROUP BY order_dt;
That would be "sample" only 10% of the lines by using the clause of "SAMPLE", so you have to multiply the number by the same factor to get comparable to the 'real' query results
Please note that depending on how "asymmetric" distribution of your data is in any of the blocks table if you use only a small sample your results, maybe average, then you might need to test with varying degrees of sampling.
Kind regards
Randolf
Oracle related blog stuff:
http://Oracle-Randolf.blogspot.com/
SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676 /.
http://sourceforge.NET/projects/SQLT-pp/
Tags: Database
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Concerning
Patrick
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My Blog: http://www.inside-oracle-apex.com
APEX Plug-Ins: http://apex.oracle.com/plugins
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Hi friends,
Reference post https://community.oracle.com/thread/3520158
If the order of processing of a SQL statement is
OF-> WHERE-> GROUP-> GET-> SELECT-> ORDER BY
So why do I get errors in a different order:
See for more information.
(A). all fields are false. FROM a known first.
SQL > SELECT EAEED
2 FROM DEEP FISHING
3. WHERE MODOU > 3
GROUP 4 BY EDDEW
5 HAVE EDEW = 5
6 ORDER BY ERA;
DEEP FISHING
*
ERROR on line 2:
ORA-00942: table or view does not exist
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SQL > SELECT EAEED
2 FROM EMP
3. WHERE MODOU > 3
GROUP 4 BY EDDEW
5 HAVE EDEW = 5
6 ORDER BY ERA;
ORDER BY ERA
*
ERROR on line 6:
ORA-00904: "ERA": invalid identifier
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SQL > SELECT EAEED
2 FROM EMP
3. WHERE MODOU > 3
GROUP 4 BY EDDEW
5 HAVE EDEW = 5
6 ORDER BY ENAME;
AFTER YOU HAVE EDEW = 5
*
ERROR on line 5:
ORA-00904: "EDEW": invalid identifier
(D). WITH withdrawal clause.
SELECT EAEED
FROM EMP
WHERE MODOU > 3
EDDEW GROUP
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ORDER BY ENAME;
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2 FROM EMP
3. WHERE MODOU > 3
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(F) fixed WHERE
SQL > SELECT EAEED
2 FROM EMP
3. WHERE deptno <>10
GROUP 4 BY EMPNO
5 WITH EDEW = 5
6 ORDER BY ENAME;
SELECT EAEED
*
ERROR on line 1:
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(G). SELECT correction
SELECT EMPNO
FROM EMP
WHERE deptno <>10
GROUP BY EMPNO
VIEW count (*) > 1
ORDER BY Empno;
EMPNO
----------
7369
7499
7521
7566
7654
7698
7788
7844
7876
7900
7902
11 selected lines.
This means SQL executed in different order, or there is some reason to get error in that order?
Hello
Kimmy says:
HI Frank and Baris,
Is that means there is a defined order for execution of SQL to oracle but compiling the SQL statement has no order defined by the (FROM, WHERE, GROUP BY) clauses and compilation may give error in any order, and which will compile all first does matter?
Kind regards
The system can choose to compile an SQL statement in any order. I have never seen a case where this order is significant to anyone. (I don't know what is important to you.)
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Always tell what version of Oracle you are using.Published by: Frank Kulash on 12 March 2012 18:14
Example of change -
Question of the order of events and functions
Hello
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So here it is:
I not know how to operate the functions-> if you have:
function function1() {}
function3();
}
function function2() {}
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}
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function2();
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OK, so now I have this situation:
If you have an INTERNAL component that is in the MAIN component. If you addEventListener (FlexEvent.CREATION_COMPLETE, test) inside of the INSIDE (class of the function of construction in my case) and also add the same event listener once again inside but the MAIN ingredient such as:
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FM_Flame wrote:
Hi Alex, guys,.
so, I would like to summarize the question and if we can just say Yes or I guided even what is Yes, then there is no confusion
Here are 2 scenarios:
1) 2 headphones are added to the same same thing e.g. CREATION_COMPLETE - one for the component and the other to the container.
It works like this:
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b) containing-> creationCompleteHandler starts to perform its functions/activities
The question here is: will a) be 100% full before before flash moves to b) or b) could happen sometimes some time one) is running?
Note: Yes this means a) will be 100% complete bofore b) occurs.
2) for the second scenario allows to take 2 different events INITIALIZE and the FlexEvent CREATION_COMPLETE and add the listener both in the component only this time, so we do not complicate things.
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Note: Yes this means a) will be 100% complete bofore b) occurs.
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It's nice to have answers Yes/No, but only if you want to write poor code that can work, by accident, until something changes that you have no control over.
Do not write code that depends on the order this event handler is called for the same event.
(2) initialize occurs before the complete creation. The answer is Yes.
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Free run event counter when counter source is low
Hi all
I'm trying to implement a counter of simple events on a 6036 using NiDaq and VB6. I have connected a quadrature encoder to board one on pin of counter0src phase. Configure the counter is a counter of events, not winnowed. Start the meter and all is ok except when the counter0src PIN is low, the meter will record the random impulses. A voltmeter attached to pin watch 0.0 x volts and no tension noticeable glitches. If I short the PIN to ground, it has found no consideration, false impulses themselves.
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Hello
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SELECT NULL LINK, TO_CHAR(d, 'HH24')|| ' h.' AS date1, ROUND(MAX(v) OVER(PARTITION BY g), 2) AS valeur FROM (SELECT d, v, COUNT(v) OVER(ORDER BY d) AS g FROM (SELECT d, AVG(valeur) AS v FROM evv_st25,(SELECT TO_DATE('03/11/2014', 'DD/MM/YYYY') + (LEVEL - 1) / 24 AS d FROM DUAL CONNECT BY LEVEL <= 24) WHERE date1(+) >= d AND date1(+) < d + 1 / 24 AND clef_var(+) = 3991 GROUP BY d ORDER BY d ) )
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It is a little more complex, I think.
Try this
ksdfskdg SELECT NULL AS LINK, TO_CHAR(d, 'HH24')|| ' h.' AS date1, ROUND(MAX(v) OVER(PARTITION BY g), 2) AS valeur FROM (SELECT d, v, COUNT(v) OVER(ORDER BY d) AS g FROM (SELECT d, AVG(valeur) AS v FROM evv_st25, (SELECT TO_DATE('03/11/2014', 'DD/MM/YYYY') + (LEVEL - 1) / 24 AS d FROM DUAL CONNECT BY LEVEL <= 24) WHERE date1(+) >= d AND date1(+) < d + 1 / 24 AND clef_var(+) = 3991 GROUP BY d -- ORDER BY d -- no need to sort here ) ) order by 2;
concerning
Kay -
I am currently building a count field that increments for groups of consecutive lines.
SELECT EMPLOYEE_ID, DTE, HOURS, JOB, ACTIVITY FROM (SELECT EMPLOYEE_ID, DTE, HOURS, JOB, ACTIVITY_CDE, LAG (JOB, 1, JOB) OVER (ORDER BY DTE) AS prev_jobnum, LEAD (JOB, 1, JOB) OVER (ORDER BY DTE) AS next_jobnum FROM tablename WHERE T_YEAR >= '2012' AND EMPLOYEE_ID = '1234' AND HOURS >= '8' WHERE JOB = 'SICK' AND (JOB = prev_jobnum OR JOB = next_jobnum)
The result:
EMPLOYEE_ID DTE HOURS JOB ACTIVITY SICK_COUNTER 1234 11/03/2013 7 SICK GENLV 1 1234 12/03/2013 7 SICK GENLV 2 1234 19/02/2014 7 SICK GENLV 3 1234 20/02/2014 7 SICK GENLV 4 1234 21/02/2014 7 SICK GENLV 5 1234 07/08/2014 7 HOLIDAY GENLV 1 1234 08/08/2014 7 HOLIDAY GENLV 2 I need the meter to zero when it's not the same consecutive game. The result should look like this:
EMPLOYEE_ID DTE HOURS JOB ACTIVITY SICK_COUNTER 1234 11/03/2013 7 SICK GENLV 1 1234 12/03/2013 7 SICK GENLV 2 1234 19/02/2014 7 SICK GENLV 1 1234 20/02/2014 7 SICK GENLV 2 1234 21/02/2014 7 SICK GENLV 3 1234 07/08/2014 7 HOLIDAY GENLV 1 1234 08/08/2014 7 HOLIDAY GENLV 2 Any ideas?
OK, this is my last attempt for today.
If test you it, don't forget some cases with the holidays.
If you a protection requirements were implemented properly, perhaps we can find a less cumbersome approach:
with pre_grps like)
Select
employee_id
dte
hours
work
activity
-1 start of a new group of sick, 0 no group start, -1 start again no group sick
When job = 'ILL' - sick with precessor ('sick', 'HOLIDAYS') and the offset in hours > = 7 cannot be a new group
and offset (employment) over (partition by employee_id) stopped by dte ('sick', 'HOLIDAY')
and the offset (in hours) over (partition by employee_id) stopped by dte > = 7
then 0
When job = 'HOLIDAY '.
so to case when lag (job 1, employment) over (partition by employee_id stopped by dte) = "SICK".
and offset (hours, 1, 0) over (partition by employee_id stopped by dte) > = 7
and lead(job,1,job) over (partition by employee_id stopped by dte) = "SICK".
and lead (hours, 1, 0) over (partition by employee_id stopped by dte) > = 7
then 0 - holiday cant never be the beginning of a group of consecutive sick if it is included by sick
-Hypothesis: entry only vacation between two entrances for SICK
1 other
end
1 other
end grp_flag
, case when work = 'HOLIDAY '.
so to case when lag (job 1, employment) over (partition by employee_id stopped by dte) = "SICK".
and offset (hours, 1, 0) over (partition by employee_id stopped by dte) > = 7
and lead(job,1,job) over (partition by employee_id stopped by dte) = "SICK".
and lead (hours, 1, 0) over (partition by employee_id stopped by dte) > = 7
then "SICK".
another job
end
another job
end job_drv
from the data
)
grps as)
Select
employee_id
dte
hours
work
activity
sum (grp_flag) on the grp (partition by employee_id stopped by dte)
job_drv
of pre_grps
)
Select
employee_id
dte
hours
work
activity
, sum (case when job_drv = 'SICK' then 1 else 0 end) on counter (partition employe_id, order of grp by dte)
- or perhaps better
-, case when job_drv = "SICK".
-then sum (1) (partition employe_id, order of grp by dte)
-0 otherwise
-end meter
PEB
order by employee_id, dte, counter
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