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have a query and test CASE that shows the number of full-time and part-time students. A full-time student is enrolled in at least 4 courses. A part-time student is enrolled in at least 1 course, but no more than 3.
Although the query appears to work it seems a bit verbose. I was wondering if there is a more succinct way to rewrite the query. In addition, I can would like to display the students first/last names with each row that meets the criteria
Perhaps with something like this?
, LISTAGG(
NVL2(s.student_id, s.last_name || ', ' || s.first_name, NULL),
'; '
) WITHIN GROUP (ORDER BY s.last_name, s.first_name) AS students
Below are my tables, data and query I would like to shorten if possible. Thanks to all who answer and for your expertise.
CREATE TABLE students(student_id, first_name, last_name) AS
SELECT 1, 'Faith', 'Aaron' FROM dual UNION ALL
SELECT 2, 'Lisa', 'Saladino' FROM dual UNION ALL
SELECT 3, 'Leslee', 'Altman' FROM dual UNION ALL
SELECT 4, 'Patty', 'Kern' FROM dual UNION ALL
SELECT 5, 'Beth', 'Cooper' FROM dual UNION ALL
SELECT 95, 'Zak', 'Despart' FROM dual UNION ALL
SELECT 96, 'Owen', 'Balbert' FROM dual UNION ALL
SELECT 97, 'Jack', 'Aprile' FROM dual UNION ALL
SELECT 98, 'Nicole', 'Kramer' FROM dual UNION ALL
SELECT 99, 'Jill', 'Coralnick' FROM dual;
CREATE TABLE student_courses (student_id,course_id) AS
SELECT 1, 1 FROM dual UNION ALL
SELECT 2, 1 FROM dual UNION ALL
SELECT 3, 1 FROM dual UNION ALL
SELECT 4, 1 FROM dual UNION ALL
SELECT 5, 1 FROM dual UNION ALL
SELECT 1, 2 FROM dual UNION ALL
SELECT 2, 2 FROM dual UNION ALL
SELECT 3, 2 FROM dual UNION ALL
SELECT 4, 2 FROM dual UNION ALL
SELECT 5, 2 FROM dual UNION ALL
SELECT 1, 3 FROM dual UNION ALL
SELECT 2, 3 FROM dual UNION ALL
SELECT 3, 3 FROM dual UNION ALL
SELECT 4, 3 FROM dual UNION ALL
SELECT 5, 3 FROM dual UNION ALL
SELECT 97, 1 FROM dual UNION ALL
SELECT 97, 3 FROM dual UNION ALL
SELECT 97, 5 FROM dual UNION ALL
SELECT 97, 6 FROM dual UNION ALL
SELECT 98, 3 FROM dual UNION ALL
SELECT 98, 4 FROM dual UNION ALL
SELECT 98, 5 FROM dual UNION ALL
SELECT 99, 2 FROM dual UNION ALL
SELECT 99, 4 FROM dual UNION ALL
SELECT 99, 5 FROM dual UNION ALL
SELECT 99, 6 FROM dual;
WITH enrolled_student_course_counts AS (
SELECT
s.student_id
, s.first_name
, s.last_name
, COUNT(sc.course_id) AS course_count
FROM students s
LEFT JOIN student_courses sc
ON s.student_id = sc.student_id
GROUP BY
s.student_id
, s.first_name
, s.last_name
HAVING COUNT(sc.course_id) > 0
)
, student_enrollment_statuses AS (
SELECT
student_id
, first_name
, last_name
, CASE WHEN course_count >= 4 THEN 'full-time'
WHEN course_count BETWEEN 1 AND 3 THEN 'part-time'
END AS student_enrollment_status
FROM enrolled_student_course_counts
)
SELECT
UPPER(student_enrollment_status) AS student_enrollment_status
, COUNT(student_enrollment_status) AS student_enrollment_status_count
FROM student_enrollment_statuses
GROUP BY student_enrollment_status;
As you only need the numbers (and not any other data), shorten the query so that it searches only the student_courses table:
SQL> with temp as
2 (select student_id,
3 count(course_id) cnt
4 from student_courses
5 group by student_id
6 )
7 select
8 sum(case when cnt < 4 then 1 else 0 end) part_time,
9 sum(case when cnt >= 4 then 1 else 0 end) full_time
10 from temp;
PART_TIME FULL_TIME
---------- ----------
6 2
SQL>
I need to group values inside a query using (or not) the command Rtrim(Xmlagg (Xmlelement (e,column || ',')).extract ( '//text()' ).GetClobVal(), ','), but I can't find any literature where explain a way to group the data inside this command. The code is very simple, as you can see below:
SELECT ID,
Rtrim(Xmlagg (Xmlelement (and, CONTRACTS || ',')).extract ( '//text()' ).GetClobVal(), ',') AS CONTRACTS
FROM TABLE_A
GROUP BY ID
The result in CONTRACTS is always repeated when the ID is found, thats ok, it´s working!
ID
CONTRACTS
876
1,1,1,2,3,3
But what I really need is this return:
ID
CONTRACTS
876
1,2,3
It´s not necessary to use the command Rtrim(Xmlagg (Xmlelement (e,column || ',')).extract ( '//text()' ).GetClobVal(), ','), instead, I just use to concatenate element with comma "," in the same column.
If anyone can help me, I would be very grateful!
If your values will fit into a VARCHAR2 data type (rather than a CLOB) then you can use a nested sub-query to get the DISTINCT values for each ID:
SELECT ID,
LISTAGG(contracts, ',') WITHIN GROUP (ORDER BY contracts) AS CONTRACTS
FROM ( SELECT DISTINCT id, contracts FROM TABLE_A)
GROUP BY ID
Or, from Oracle 19c, it is built-in to LISTAGG:
SELECT ID,
LISTAGG(DISTINCT contracts, ',') WITHIN GROUP (ORDER BY contracts) AS CONTRACTS
FROM TABLE_A
GROUP BY ID
If you want a CLOB then you can use the same technique as the first query:
SELECT ID,
Rtrim(
Xmlagg(
Xmlelement(name, CONTRACTS || ',')
ORDER BY contracts
).extract ( '//text()' ).GetClobVal(),
','
) AS CONTRACTS
FROM (SELECT DISTINCT id, contracts FROM TABLE_A)
GROUP BY ID
Which, for the sample data:
CREATE TABLE table_a (id, contracts) AS
SELECT 876, 1 FROM DUAL UNION ALL
SELECT 876, 1 FROM DUAL UNION ALL
SELECT 876, 1 FROM DUAL UNION ALL
SELECT 876, 2 FROM DUAL UNION ALL
SELECT 876, 2 FROM DUAL UNION ALL
SELECT 876, 3 FROM DUAL UNION ALL
SELECT 876, 3 FROM DUAL UNION ALL
SELECT 876, 3 FROM DUAL;
All output:
ID
CONTRACTS
876
1,2,3
db<>fiddle here
It's much easier to do all those operation in XML functions: DBFiddle
SELECT--+ NO_XML_QUERY_REWRITE
id,
xmlquery(
'string-join(distinct-values($R/R/X/text()),",")'
passing
Xmlelement(
R,
Xmlagg(
Xmlelement (X, CONTRACTS)
order by CONTRACTS
)) as R
RETURNING CONTENT
) AS CONTRACTS
FROM TABLE_A
GROUP BY ID;
Full example with test data:
with table_a (id, contracts) AS (
SELECT 876, 1 FROM DUAL UNION ALL
SELECT 876, 1 FROM DUAL UNION ALL
SELECT 876, 1 FROM DUAL UNION ALL
SELECT 876, 2 FROM DUAL UNION ALL
SELECT 876, 2 FROM DUAL UNION ALL
SELECT 876, 3 FROM DUAL UNION ALL
SELECT 876, 3 FROM DUAL UNION ALL
SELECT 876, 3 FROM DUAL
)
SELECT--+ NO_XML_QUERY_REWRITE
id,
xmlquery(
'string-join(distinct-values($R/R/X/text()),",")'
passing
Xmlelement(
R,
Xmlagg(
Xmlelement (X, CONTRACTS)
order by CONTRACTS
)) as R
RETURNING CONTENT
) AS CONTRACTS
FROM TABLE_A
GROUP BY ID;
(SELECT LISTAGG(EVENT_DESC, ',') WITHIN GROUP (ORDER BY EVENT_DESC) FROM EVENT_REF WHERE EVENT_ID IN
( SELECT REGEXP_SUBSTR(AFTER_VALUE,'[^,]+', 1, level) FROM DUAL
CONNECT BY REGEXP_SUBSTR(AFTER_VALUE, '[^,]+', 1, level) IS NOT NULL
)
)
A table from which I am fetching AFTER_VALUE has values of integer which is comma seperated like
AFTER_VALUE data
Expected output
1
Event1
1,2
Event1,Event2
1,12,2,5
Event1,Event12,Event2,Event5
15,13
Event15,Event13
these are Ids in EVENT_REF table which have some description. I am trying to basically present
ex. 1,2 as Event1, Event2 and send back from query. There are multiple events so using REPLACE would be very tedious.
When using above query I'm getting error as “ORA-01722: invalid number” whenever there is more than one value in AFTER_VALUE column Ex. if there exists only one id , then the query works but for values like 1,2 or 1,13 etc it throws invalid number error.
PS: The event names are not Event1,Event2 etc , I have just put for reference.
You don't even need regular expressions for this assignment. Standard string function replace() can do the same thing, and faster. You only need an extra 'Event' at the beginning of the string, since that one doesn't "replace" anything.
Like this: (note that you don't need the with clause; I included it only for quick testing)
with
event_ref (after_value) as (
select '1' from dual union all
select '1,2' from dual union all
select '1,12,2,5' from dual union all
select '15,13' from dual
)
select after_value,
'Event' || replace(after_value, ',', ',Event') as desired_output
from event_ref
;
AFTER_VALUE DESIRED_OUTPUT
----------- -----------------------------
1 Event1
1,2 Event1,Event2
1,12,2,5 Event1,Event12,Event2,Event5
15,13 Event15,Event13
Ah,ok, looks, like you have other characters in your comma-separated list, so you can use this query:
with EVENT_REF(EVENT_ID,EVENT_DESC) as (
select 1, 'Desc 1' from dual union all
select 2, 'Desc 2' from dual union all
select 3, 'Desc 3' from dual union all
select 4, 'Desc 4' from dual union all
select 5, 'Desc 5' from dual union all
select 12, 'Desc12' from dual union all
select 13, 'Desc13' from dual union all
select 15, 'Desc15' from dual
)
select
(SELECT LISTAGG(EVENT_DESC, ',')
WITHIN GROUP (ORDER BY EVENT_DESC)
FROM EVENT_REF
WHERE EVENT_ID IN
( SELECT to_number(REGEXP_SUBSTR(AFTER_VALUE,'\d+', 1, level))
FROM DUAL
CONNECT BY level<=REGEXP_COUNT(AFTER_VALUE, '\d+')
)
)
from (
select '1' AFTER_VALUE from dual union all
select '1,2' AFTER_VALUE from dual union all
select '1,12,2,5' AFTER_VALUE from dual union all
select '15,13' AFTER_VALUE from dual
);
PS. And do not forget that to_number has 'default on conversion error' now: https://docs.oracle.com/en/database/oracle/oracle-database/12.2/sqlrf/TO_NUMBER.html
There is no need to split and concatenate substrings, just use regexp_replace:
with EVENT_REF (AFTER_VALUE) as (
select '1' from dual union all
select '1,2' from dual union all
select '1,12,2,5' from dual union all
select '15,13' from dual
)
select regexp_replace(AFTER_VALUE,'(\d+)','Event\1') from EVENT_REF;
REGEXP_REPLACE(AFTER_VALUE,'(\D+)','EVENT\1')
-----------------------------------------------
Event1
Event1,Event2
Event1,Event12,Event2,Event5
Event15,Event13
Hi all I have requirement to pick records using dynamic pivoting in Oracle. I have done with my query which is working fine using "antonsPivoting" https://technology.amis.nl/2006/05/24/dynamic-sql-pivoting-stealing-antons-thunder/.
When i add the query in procedure it gives error: ORA-22905: cannot access rows from a non-nested table item.
Sample table script:
CREATE TABLE DEPARTMENT(DEPT_ID NUMBER PRIMARY KEY, DEPT_NAME VARCHAR2(25))
CREATE TABLE EMPLOYEE(EMP_ID NUMBER, EMP_NAME VARCHAR(100), DEPT_ID NUMBER , FOREIGN KEY(DEPT_ID) REFERENCES DEPARTMENT(DEPT_ID))
INSERT INTO DEPARTMENT(DEPT_ID, DEPT_NAME)
SELECT 1, 'HR' FROM DUAL
UNION ALL SELECT 2, 'OPS' FROM DUAL
UNION ALL SELECT 3, 'MKT' FROM DUAL
UNION ALL SELECT 4, 'FIN' FROM DUAL
UNION ALL SELECT 5, 'IT' FROM DUAL
UNION ALL SELECT 6, 'SERV' FROM DUAL
COMMIT;
INSERT INTO EMPLOYEE(EMP_ID, EMP_NAME, DEPT_ID)
SELECT 1, 'A', 1 FROM DUAL
UNION ALL SELECT 1, 'A', 1 FROM DUAL
UNION ALL SELECT 2, 'B', 1 FROM DUAL
UNION ALL SELECT 3, 'C', 2 FROM DUAL
UNION ALL SELECT 4, 'D', 3 FROM DUAL
UNION ALL SELECT 5, 'E', 3 FROM DUAL
UNION ALL SELECT 6, 'F', 4 FROM DUAL
UNION ALL SELECT 7, 'G', 4 FROM DUAL
UNION ALL SELECT 8, 'H', 4 FROM DUAL
UNION ALL SELECT 9, 'I', 5 FROM DUAL
UNION ALL SELECT 10, 'J', 5 FROM DUAL
UNION ALL SELECT 11, 'K', 1 FROM DUAL
UNION ALL SELECT 12, 'L', 1 FROM DUAL
COMMIT;
sample query script working fine:
SELECT D.DEPT_NAME, COUNT(E.EMP_ID) TOTAL_EMP
FROM DEPARTMENT D
LEFT JOIN EMPLOYEE E ON D.DEPT_ID= E.DEPT_ID
GROUP BY D.DEPT_NAME
;
Dynamic pivoting example working fine:
select * from table( pivot( '
SELECT D.DEPT_NAME, COUNT(E.EMP_ID) TOTAL_EMP
FROM DEPARTMENT D
LEFT JOIN EMPLOYEE E ON D.DEPT_ID= E.DEPT_ID
GROUP BY D.DEPT_NAME' ) )
;
adding in procedure which gives error:
CREATE OR REPLACE PROCEDURE GET_EMPLOYEE (P_RESULT OUT SYS_REFCURSOR)
IS
BEGIN
OPEN P_RESULT FOR
select * from table( pivot( '
SELECT D.DEPT_NAME, COUNT(E.EMP_ID) TOTAL_EMP
FROM DEPARTMENT D
LEFT JOIN EMPLOYEE E ON D.DEPT_ID= E.DEPT_ID
GROUP BY D.DEPT_NAME' ) )
;
END
;
Have you created the Pivot function ?
Please go through below link where this is already answered.
Link
Need help to achieve below result:
source data:
Output Expected:
Query to generate source data:
SELECT '43443' AS MSISDN,'Turkey' AS LOC,TRUNC(SYSDATE) AS DATA_DAY FROM DUAL
UNION
SELECT '43443' AS MSISDN,'Turkey' AS LOC,TRUNC(SYSDATE-1) AS DATA_DAY FROM DUAL
UNION
SELECT '43443' AS MSISDN,'India' AS LOC,TRUNC(SYSDATE-2) AS DATA_DAY FROM DUAL
UNION
SELECT '43443' AS MSISDN,'Eng' AS LOC,TRUNC(SYSDATE-3) AS DATA_DAY FROM DUAL
UNION
SELECT '43446' AS MSISDN,'Eng' AS LOC,TRUNC(SYSDATE-4) AS DATA_DAY FROM DUAL
UNION
SELECT '43446' AS MSISDN,'India' AS LOC,TRUNC(SYSDATE-5) AS DATA_DAY FROM DUAL;