How To Count All Tuples Then Compute GPA Pertaining To ID
Apr 1, 2011
I'm a student researching SQL, Oracle queries. I'm currently writing a oracle:JDBC to query by id, then receive all tuples that belong to id and compute GPA. I convert letter-grade to # in query how to count rows pertaining to id, then average GPA of all tuples. I understand Count(*) where sid=?, but i need to count the rows for id, then convert letter to number, finally compute gpa for all pertaining tuples belonging to id.
Everything works find but the last query for my JDBC prog.Here is my query as of now...
"SELECT grade, CASE WHEN grade = 'F' THEN 0 WHEN grade = 'D' THEN 1 WHEN grade = 'C' THEN 2 WHEN grade = 'B' THEN 3 WHEN grade= 'A' THEN 4 END AS letter_grade FROM Grades"
How do I count all tuples then compute the gpa pertaining to id.For all IDs?
how can i compute row wise multiplication for each unique value of id. I am trying to get the output as showing id and their respective results after multiplying the corresponding values.
CREATE TABLE mult_tbl( id NUMBER, val number ); insert all into mult_tbl values (1,2) into mult_tbl values (1,3)
I have to create some indexes in a production database. Do I need to Compute Statistics after creating indexes? Or when I create they automatically are computed?
The version I'm using is:
Oracle Database 10g Release 10.2.0.5.0 - 64bit Production PL/SQL Release 10.2.0.5.0 - Production CORE 10.2.0.5.0 Production TNS for 64-bit Windows: Version 10.2.0.5.0 - Production NLSRTL Version 10.2.0.5.0 - Production
My issue is with a calculation using columns as variables. below is the code to create and attached is the code (INSERT_data.txt) to fill-in the required tables....
what's required here?
I need to update (through update or simply create new table statement)
BPF(i), BPC(i), BPY(i) of table root_tbl (A) based on InF_IDX, InC_IDX & InY_IDX and OutF_IDX, OutC_IDX & OutY_IDX using BPF(i), BPC(i), BPY(i) from table pvt_vectors_tbl(B).
Join Clause: A.P_NODE=B..P_NODE and A.C_NODE=B.C_NODE and A.P_NODE_Date=B.P_NODE_Date and A.C_NODE_Date=B.C_NODE_Date
the formula are:
BPF(i): if A.InF_IDX<=A.OutF_IDX then FOR i=1 to A.OutF_IDX+1 if i<InF_IDX then A.BPF(i)= A.BPF(i)+ B.BPF(OutF_IDX + i - InF_IDX); else A.BPF(i)=0; i=i+1; else FOR i=1 to A.InF_IDX+1 if i<OutF_IDX then A.BPF(i)= A.BPF(i)+ B.BPF(InF_IDX + i - OutF_IDX); else A.BPF(i)=0; i=i+1; idem for BPc and BPY.
in real word:
* root_tbl table has ~2 million records, 50 BPF(i) columns, 50 BPC(i) columns and ~475 BPY(i) columns * pvt_vectors_tbl has ~50.000 records
I am new to PL/SQL and how to create a trigger to compute the population of the school from the groups of students and store back in population. It also needs to check that there is a min of 10 students to a school.
CREATE OR REPLACE TYPE group_type AS OBJECT ( group_nameVARCHAR2(20), tutor_idNUMBER(5),
Within each DeptID group I need to calculate absolute change of 'Count' column between previous and current months and compare change value with threshold.
If ratio >= threshold N number of times I need to make a note of that event. Threshold = 0.1 N = 2 - alert needs to exceed threshold two consequtive times
Here is data processing algorithm:
1. Calculate change between month 2010-04 and 2010-05: abs((1134/1392 - 1))= 0.18; 2. check change value against threshold: 0.18 > 0.1 3. Threshold was exceeded, set alert_fired_cnt counter to = 1 4. Once alert fired it creates a baseline for comparison - I need to use Count from month 2010-04: We're now in month 2010-06: abs(1094 / 1392 - 1)=0.21 5. check change value against threshold: 0.21 > 0.1 6. Threshold was exceeded, increment alert_fired_cnt counter by 1 = 2 7. At this point alert exceede threshold two times, I need to set a alert_triggered flag = 1 and reset alert_fired_cnt = 0 for further calculations 8. We're in montn 2010-07: abs(1333/1294-1)=0.03 8. check change value against threshold: 0.03 < 0.1 9. Since threshold was not exceeded, keep alert_fired_cnt counter to = 0
Above algorithm needs to be run for all DeptID groups.
I load above data into an associative array and loop through elements. I am having trouble keeping computations within each DeptID group.
I have an interactive report with two columns timestamp type. I want to use the compute action in order to get the difference between those dates. Nevertheless I got values like this: +000000008 00:00:00.000000.
I tried BRK and COMPUTE commands myself after reading the documentation but its not working...The output of my script is correct but What I want is the information to be displayed on a different way:
Original script for the report:
set serveroutput on size 1000000 set pages 10000 set lines 1000 set arraysize 1 set trimspool on set heading off [code]....
The output should be exactly as above as the requirement is this should be in this particular order and how many is the count in each thoroughfare or locality, as shown in the final output, above.
I load a table through sql loader which takes nearly 14 min for 8-9 millions records, once the records complete i run the analyze table compute statics to gather stats and it takes nearly 15 min. is there any ways so that i can reduce the stats timing. the stats collection command runs from other schema not from where the table is residing.
difference between count(1) and count(*). As i know count(*) will give number of rows irrespective of null and count(1) will not count the null.My Oracle version is 10 g.
SQL> select * from t1;
A B C ---------- -------------------- -------------------- 1 2 3 2 5
SQL> select rownum,a.* from t1 a;
ROWNUM A B C ---------- ---------- -------------------- -------------------- 1 1 2 3 2 2 3 5 4 [code]....
I'm using this code, and it performs fine, but I'm wondering if there is a more elegant way to do it--maybe with "ROLLBACK". Basically (as you can see) I need to get a normal count for each group but also for each group take a percentage of the total count (so all groups pct adds up to 100 (oh yeah, don't test for zero below, but just a test... )
select c.Event, c.code, count(1) as calls, total.total_count, count(1) / total.total_count * 100 as pct_of_total from table1 c
[Code]....
[Edit MC: add code tags, do it yourself next time]
Reg. Area Age <=19 20 <= Age <= 24 25 <=Age <= 29 Total No. of Voters xxxx 10 15 7 32 yyyy 5 7 3 15
I have work out a script but the age is not in a range
select * FROM (select rgs_id_reg_area, count(decode(fbd_age,19,fbd_age)) Age19, count(decode(fbd_age,20,fbd_age)) Age20 FROM rubyvoterstat where vote ='Y' GROUP by rgs_id_reg_area) order by rgs_id_reg_area
I am running this query but am not getting data that is correct.
SELECT a.prod_id, a.prod_name, a.artist_name, COUNT(*) FROM po_my_purchase_tb a, cm_track_tb b WHERE a.prod_id = b.prod_id and b.GNR_CD = 'GR000017' AND a.purchase_date > '10-FEB-10' AND ROWNUM<50 GROUP BY a.prod_id, a.prod_name, a.artist_name, a.buy_seq ORDER BY COUNT(*) desc
I need to get an accumulated value for a count. E.g. The table has purchased date, purchased item, purchased item type. The count of purchased item groyup by purchased type on every purchased date. Now, we got the count value (purchased item). But, I want the accumulated count value on every purchased date. So that I will get that how many items has been purchased on a particular date.
I pulled in 1121 SSN's into a table and am using that table as the basis for returning data from other tables...including how many documents a user has in their folder.
My query; however, is only returning 655 rows...it is returning only those rows that have documents in their folders. I want to return ALL rows...WHETHER OR NOT THEY HAVE A DOCUMENT COUNT (count(*)). How can I get all 1,121 rows to return? I would like the output to look like:
SSN LOCATION EMP_STATUS FOL_STATUS COUNT(*) -- For those folders containing documents: XXX-XX-XXXX WHATEVER WHATEVER WHATEVER 12
-- For those folders containing 0 documents: XXX-XX-XXXX WHATEVER WHATEVER WHATEVER NULL
Here is the query in it's current state:
-- Get User/Folder/Doc Count Information SELECT b.ssn, b.location, b.emp_status, c.fol_status, COUNT (*)
[Code]....
So again, my problem here is that...not all FOLDERS contain DOCUMENTS...but I still want the folder data lised...I just need it listed with either a zero count (0), or a NULL in the COUNT(*) column.
I'm trying the various joins, but none of them seem to be working.
I've tried the old 8i (+) join as follows:
AND c.fol_id = d.doc_fol_id(+)
I've tried the inner join:
AND c.fol_id(+) = d.doc_fol_id
...and I've tried the 9i method (left outer and full outer) using the following types of notations:
folder c full outer join documend d on c.fol_id = d.doc_fol_id
...so far, no luck. I'm still having only 655 rows returned (the 655 are those folders that HAVE document count > 0. Any folder that has zero documents in the document table just aren't being returned in the query.)
we're having a few tables which queries about 10.000 articles. As we don't show them all at once we are using pagination and use the rownum to show only a limited number of the results.
Now as these queries are pretty complex we have to optimize them and since we use pagination we have to call our query twice (first we make a count(*) and then we call the small resultset of a few rows). Ofcourse we are looking for a solution to call it only once and still use the pagination. We could load the whole resultset of 10.000 results and let java show only a few but that makes our line between the oracle and webserver pretty heavy. Is there a way to call the total number of results and give back only a small resultset just in one query?
