Channels for the identification of the records by using the syntax for Connect By
HelloCan someone help with the following problem please?
Our database records evaluations of the child for families in difficulty. When get us in touch with them, ideallu:
A child receives a preliminary assessment (evaluation).
If they are deemed to have need for additional support, they are given a second assessment (B) that is triggered by the assessment and an ID of the trigger to identify what assessment he comes.
If they are deemed to need further support, they are given a third evaluation (C) that is triggered by the 2 assessment and an ID of the trigger to show that it comes from the b. assessment
This is also true for a fourth assessment (assessment) report that is triggered by the evaluation C.
However, due to the poor implementation of this concept by our provider database and the lack of knowledge by the workers, we have 2 problems:
(1) analysis has isn't always the starting point as a worker can start any assessment at any time, i.e. from c assessment.
(2) in view of this, a child can have several evaluations of the same type, i.e. a x 3 C, 2 x B assessment assessment in no particular order.
The problem:
I need to identify the separate strings (desired_output) of intervention using the relationship between the registration ID and the ID of the trigger, as shown in the table below:
CHILD_ID RECORD_ID TRIGGER_ID ASM_NAME REC_START_DATE REC_END_DATE DESIRED_OUTPUT
-------- --------- ---------- -------- ------------------------- ------------------------- ----------------------
A00001 R297931 B 18-JUN-10 18-JUN-10 1
A00001 R299381 R297931 C 23-JUN-08 23-JUN-08 1
A00001 R133219 A 12-AUG-08 12-AUG-08 2
A00001 R240118 A 30-OCT-09 30-OCT-09 3
A00001 R604913 A 17-AUG-12 17-AUG-12 4
A00001 R604943 R604913 B 17-AUG-12 17-AUG-12 4
A00001 R604961 R604943 C 17-AUG-12 03-SEP-12 4
A00001 R605195 B 25-AUG-12 25-AUG-12 5
A00001 R605214 A 28-AUG-12 28-AUG-12 6
A00001 R609999 R604961 D 03-SEP-12 05-SEP-12 4
select * from
(select * from
(select 'A00001' as child_id, 'R297931' as record_id, null as trigger_id, 'B' as asm_name, to_date('18-06-2010','dd/mm/yyyy') as rec_start_date, to_date('18-06-2010','dd/mm/yyyy') as rec_end_date, 1 as desired_output from dual) union all
(select 'A00001' as child_id, 'R299381' as record_id, 'R297931' as trigger_id, 'C' as asm_name, to_date('23-06-2008','dd/mm/yyyy') as rec_start_date, to_date('23-06-2008','dd/mm/yyyy') as rec_end_date, 1 as desired_output from dual) union all
(select 'A00001' as child_id, 'R133219' as record_id, null as trigger_id, 'A' as asm_name, to_date('12-08-2008','dd/mm/yyyy') as rec_start_date, to_date('12-08-2008','dd/mm/yyyy') as rec_end_date, 2 as desired_output from dual) union all
(select 'A00001' as child_id, 'R240118' as record_id, null as trigger_id, 'A' as asm_name, to_date('30-10-2009','dd/mm/yyyy') as rec_start_date, to_date('30-10-2009','dd/mm/yyyy') as rec_end_date, 3 as desired_output from dual) union all
(select 'A00001' as child_id, 'R604913' as record_id, null as trigger_id, 'A' as asm_name, to_date('17-08-2012','dd/mm/yyyy') as rec_start_date, to_date('17-08-2012','dd/mm/yyyy') as rec_end_date, 4 as desired_output from dual) union all
(select 'A00001' as child_id, 'R604943' as record_id, 'R604913' as trigger_id, 'B' as asm_name, to_date('17-08-2012','dd/mm/yyyy') as rec_start_date, to_date('17-08-2012','dd/mm/yyyy') as rec_end_date, 4 as desired_output from dual) union all
(select 'A00001' as child_id, 'R604961' as record_id, 'R604943' as trigger_id, 'C' as asm_name, to_date('17-08-2012','dd/mm/yyyy') as rec_start_date, to_date('03-09-2012','dd/mm/yyyy') as rec_end_date, 4 as desired_output from dual) union all
(select 'A00001' as child_id, 'R605195' as record_id, null as trigger_id, 'B' as asm_name, to_date('25-08-2012','dd/mm/yyyy') as rec_start_date, to_date('25-08-2012','dd/mm/yyyy') as rec_end_date, 5 as desired_output from dual) union all
(select 'A00001' as child_id, 'R605214' as record_id, null as trigger_id, 'A' as asm_name, to_date('28-08-2012','dd/mm/yyyy') as rec_start_date, to_date('28-08-2012','dd/mm/yyyy') as rec_end_date, 6 as desired_output from dual) union all
(select 'A00001' as child_id, 'R609999' as record_id, 'R604961' as trigger_id, 'D' as asm_name, to_date('03-09-2012','dd/mm/yyyy') as rec_start_date, to_date('05-09-2012','dd/mm/yyyy') as rec_end_date, 4 as desired_output from dual)) child_recordsI thought I could use connect_by_root to group common assessments, but I am not convinced that this will give consistent results.
-------------------------
select
child_records.*,
connect_by_root(nvl(trigger_id,record_id)) chain_id
from child_records
connect by trigger_id = prior record_idIs an alternative, possibly using trigger_id = above lag(record_id,1,null) (child_id order partition of...) but the assessments are in no particular order, I don't think I can specify a command clause...?
Can anyone help to generate the desired output please?
Thank you
TP
Hello
Little Penguin says:
... However, due to the poor implementation of this concept by our provider database and the lack of knowledge by the workers, we have 2 problems:(1) analysis has isn't always the starting point as a worker can start any assessment at any time, i.e. from c assessment.
(2) in view of this, a child can have several evaluations of the same type, i.e. a x 3 C, 2 x B assessment assessment in no particular order.
This isn't necessarily a bad design. If it really fits your business rules is another matter. But as a means to represent events from cause to effect, to be used to CONNECT BY queries, it makes sense.
The problem:
I need to identify the separate strings (desired_output) of intervention using the relationship between the registration ID and the ID of the trigger, as shown in the table below:
Let me assure you that I understand. You don't really have an desired_output column; you will need to that derived from other columns. Right?
CHILD_ID RECORD_ID TRIGGER_ID ASM_NAME REC_START_DATE REC_END_DATE DESIRED_OUTPUT -------- --------- ---------- -------- ------------------------- ------------------------- ---------------------- A00001 R297931 B 18-JUN-10 18-JUN-10 1 A00001 R299381 R297931 C 23-JUN-08 23-JUN-08 1 A00001 R133219 A 12-AUG-08 12-AUG-08 2 A00001 R240118 A 30-OCT-09 30-OCT-09 3 A00001 R604913 A 17-AUG-12 17-AUG-12 4 A00001 R604943 R604913 B 17-AUG-12 17-AUG-12 4 A00001 R604961 R604943 C 17-AUG-12 03-SEP-12 4 A00001 R605195 B 25-AUG-12 25-AUG-12 5 A00001 R605214 A 28-AUG-12 28-AUG-12 6 A00001 R609999 R604961 D 03-SEP-12 05-SEP-12 4Data:...
Thanks for the display of the data of the sample; that really helps.
Originally, I thought to use Oracle Connect By syntax, but it does not (as far as I can work on!) because I have no start condition (the string of assessments can start A or B or C or D) which leads to duplication of lines.
Is not
START WITH trigger_id IS NULL
identify a starting point? If something has not been triggered by something else, it is not a starting point? It is actually quite common in the hierarchical tables.
I thought I could use connect_by_root to group common assessments, but I am not convinced that this will give consistent results.
I'm not sure that you understand the problem. What do you mean by "consistent results? The doubt that you are worried, what exactly?
-------------------------
select child_records.*, connect_by_root(nvl(trigger_id,record_id)) chain_id from child_records connect by trigger_id = prior record_id
You got right. If I understand what you mean by consistent results, it will bring them. You want to START to condition, of course, and as the starting lines will never have a trigger_id, there is no need to tell
CONNECT_BY_ROOT NVL (trigger_id, record_id) AS chain_id
You can simply say
CONNECT_BY_ROOT record_id AS chain_id
This will be particularly well idnetify the strings of their record_ids. Looks like you want to assign new sequence numbers (1, 2, 3,...) to identify the channels. Which takes an extra step.
--------------------
Is an alternative, possibly using trigger_id = above lag(record_id,1,null) (child_id order partition of...) but the assessments are in no particular order, I don't think I can specify a command clause...?
Right; LAG depends on the order and order tells us nothing to this problem.
In fact, feeds means so little to this problem that an event can come before the event that triggered it.
For example, if I understand the first two lines of your output
CHILD_ID RECORD_ID TRIGGER_ID ASM_NAME REC_START_DATE REC_END_DATE DESIRED_OUTPUT -------- --------- ---------- -------- ------------------------- ------------------------- ---------------------- A00001 R297931 B 18-JUN-10 18-JUN-10 1 A00001 R299381 R297931 C 23-JUN-08 23-JUN-08 1
C event was triggered by the event B, even if C took place two years before B.
(Not that it is important for the SQL problem, but can you explain the logic of how events can come before or after the events that triggered them?) "I'm just curious.)
Here's a way you can assign sequential numbers to identify the channels:
WITH got_d_num AS
(
SELECT c.*
, ROW_NUMBER () OVER ( PARTITION BY child_id -- Just guessing
ORDER BY NVL2 ( trigger_id
, 2 -- rows with trigger_ids come 2nd
, 1 -- rows without come 1st
)
, rec_start_date
, asm_name
) AS d_num
FROM child_records c
)
SELECT child_id, record_id, trigger_id, asm_name, rec_start_date, rec_end_date
, desired_output -- if needed
, CONNECT_BY_ROOT d_num AS chain_num
FROM got_d_num
START WITH trigger_id IS NULL
CONNECT BY trigger_id = PRIOR record_id
ORDER BY child_id
, rec_start_date
, asm_name
;
Output:
` DESIRED
CHILD_ RECORD_ TRIGGER A REC_START REC_END_D _OUTPUT CHAIN_NUM
------ ------- ------- - --------- --------- --------- ----------
A00001 R299381 R297931 C 23-JUN-08 23-JUN-08 1 3
A00001 R133219 A 12-AUG-08 12-AUG-08 2 1
A00001 R240118 A 30-OCT-09 30-OCT-09 3 2
A00001 R297931 B 18-JUN-10 18-JUN-10 1 3
A00001 R604913 A 17-AUG-12 17-AUG-12 4 4
A00001 R604943 R604913 B 17-AUG-12 17-AUG-12 4 4
A00001 R604961 R604943 C 17-AUG-12 03-SEP-12 4 4
A00001 R605195 B 25-AUG-12 25-AUG-12 5 5
A00001 R605214 A 28-AUG-12 28-AUG-12 6 6
A00001 R609999 R604961 D 03-SEP-12 05-SEP-12 4 4
This example uses rec_start to affect chain_num and also sort the output, but not to determine wht in a string. The first 3 events untrigered (in rec_start order) have been in August 2008, October 2009 and June 2010, while they were assigned chain_nums 1, 2 and 3, in that order. Antyhting that was triggered by them, directly or indirectly, gets the same chain_num if it happened before or after the starting point of the chain. Thus, the first line of the output, in June 2008, gets chain_num = 3. You have assigned desired_output = 1 on this line. If you can explain how you got the number 1, we can probably find a way to code, so that the calculated chain_num is identical to desired_num. In the above query, they are not the same, but they are related. Everywhere you specified desired_output = 1, the above query produces chain_num = 3. If the numbers are the same (for example desired_output = 4 = chain_num) it's just a coincidence.
Note that when I used ROW_NUMBER, I did in a subquery, not in the main query where the CONNECT BY were made. Never use the analytical functions (for example, ROW_NUMBER) in the same query with CONNECT BY. The analytical functions are often the cause CONNECT BY conditions to be incorrectly evuated. I have never seen any literature on this subject and it doesn't always happen, but I suggest that you avoid to mix everything well.
Published by: Frank Kulash, Sep 15, 2012 10:00
Published by: Frank Kulash, Sep 15, 2012 10:44
I just read the answer from John, who has a nice illustration of my last point: use of the separate petitions for both analytical and CONNECT BY. You can use the analytic function first, and then CONNECT BY, as I did, or you can do the first CONNECT BY and then use the analytic function (in a solution of John DENSE_RANK) later. Whatever it is, you must separate them.
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Can I use USRP 2 channels at the same time to receive a signal?
Hello world
I want to do an implementation of the time difference of arrival between two receivers (antenna) estimate. I have a kit USRP, Remora and two antennas. There is only one signal source (it is transmitted in nowhere is not serious).
Can I use two channels at the same time the USRP to receive a signal?
I need the original source signal and the delayed signal version.
Thanks a lot for your help.
Sincerely yours.
Uysal.
Hello
I found this post on the forum that can be useful for you. Looks like you can not receive two antennas in the way you describe. I think that this would require a configuration USRP two.
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samples per channel and the number of samples per channel
in my DAQ mode samples finished program, there are two screws: timing and read.vi DAQmx DAQmx.
I have to set the parameter to "samples per channel" DAQmx timing.vi and 'number of samples per channel' on DAQmx read.vi... Is there a relationship between these two?
My laser runs at 1 K Hz. I want to go to the wavelength, wait for a number of shooting lasers, read the data and move on to the next page...
Thank you
Lei
In your case, the VI will acquire the lesser of either:
The "samples per channel" that you have defined on the timing DAQmx VI
-OR-
The number of iterations of your for loop (N) times the 'number of samples per channel"that you have defined on the DAQmx read VI
The "samples per Channel" VI DAQmx of timing for a finite acquisition dictates how many samples the DAQ hardware should acquire in it's onboard buffer before indicating that the acquisition is complete. "The number of samples per Channel" on the read DAQmx VI dictates how many samples the DAQmx driver must return buffer on board the aircraft to your application.
Let's say the "samples per channel" on the calendar DAQmx VI is set to 50. Thus, the card will acquire 50 samples and place them in the edge of the buffer, then stops. Suppose we have the 'number of samples per Channel"on the DAQmx reading VI the value 3 and what we call the VI in a loop For which runs 10 times. Thus, every time the DAQmx lu VI is called, it will wait until there are at least 3 samples in the buffer, and then return these three. We call the VI a total of 10 times, then we will answer 30 total samples. Thus, the last 20 samples acquired the card remains in the buffer and are destroyed when the task is disabled.
Now let's say that we increase the "number of samples per Channel" on our DAQmx Read VI at 10. VI Read will wait until 10 or more samples are in the buffer, and then return these 10. Thus, we will be back all 50 samples map acquired by the 5th iteration of the loop For. The 6th time we call him VI DAQmx Read it expires, because there will never be another 10 samples in the buffer, and the VI returns a warning.
This clarifies things?
The purpose of this behavior is to allow you to both set the total number of samples that the DAQ hardware will acquire and also control how much of these samples is returned whenever you call the DAQmx Read VI.
Kind regards
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