SQL & PL/SQL :: Select Single Query And GroupBy Together?
Jul 8, 2011
i have a problem in the following query. i need to fetch the rows such that i want to fetch all the records keeping "segment1" column as distinct and sum all of the corresponding "quantities" column.
i tried to use the partition technique. using partition solved the problem apperently. the sum function worked but redundancy in "segment1" column still persists. i used the sum function only to extract the distinct "segment1" column and summing its corresponding "quantity" column (only quantity column differs in the redundant rows...)
the second query was like:
SELECT prha.segment1,
prha.creation_date,
SUM(prla.quantity) OVER(PARTITION BY prha.segment1) AS qty,
prha.DESCRIPTION,
write a query to get the first row after order by clause using single query alone.Example:I can write following query to select first rowselect * from (selec * from t order by col1) where rownum = 1;But here I should not use inline view to get the result. Because my original requirement needs to use this query in select list and it needs to use a column (of a table from the FROM clause) in the where clause of inline query. Because there is restriction that we can not use the column (of a table from the FROM clause) more than one level of inline query.
I have 3 tables, Emp(Emp_id,emp_name),dept(dept_no,dept_name),emp_dept(emp_id,dept_no). Emp tabl ehas some 20 employes id who belongs to different departments.There are few employee who belongs to multiple departments as well. I want to fetch records of emp_id, emp_name, dept_no in the following format.
I'm trying to a sum on a group by. However if you notice there are not data in year 1997 for id 20 and not data in year 1999 for id 21. I would like the sum to come back as empty since there are missing data within the group.
Currently: GRP CNTY YR SUM AGER1996150000 AGER1997130000 =====> Should be null AGER1998170000 AGER199940000 =====> Should be null AGER2000190000 AUSA1996150000 AUSA1997160000 AUSA1998170000 AUSA1999180000 AUSA2000190000
create table test (id integer, wage number, grp varchar2(5), cnty varchar2(5),yr integer);
Having a select query where the output looks as below, as you can see when there is no record for a particular date(01-JUn-12,03-JUN-12) the count will be zero.
SELECT TRUNC(updated_date) DATE1 , COUNT(1) COUNT FROM Temp_a WHERE ZU_flag='N' AND circle_id 'NA' AND TRUNC(updated_date) >=TRUNC(SYSDATE-18) AND TRUNC(updated_date) <=TRUNC(SYSDATE) GROUP BY TRUNC(updated_date) ORDER BY TRUNC(updated_date) DESC;
I have tried with Case conditions and try to fetch that data through Sequence generating Date(not useful). I can do this with Cusror, but i need this to be done through single select query
I would like to check if the table contains invalid records. Col1 , Col2 and Col3 are seen as hierarchy levels and col1 is the top level.
For instance record 1,2,3 (level3) is valid because it exists record 1,2 (level 2). Moreover 1,2 record (level 2) is valid because it exists record 1 (top level). However 4,5 and 6,7,8 are not valid as higher levels are not completed.
How can I check in a single SELECT statement if the table contains invalid records? Maybe analitical functions or regular expressions?!
The description field in the item table has the single quote used as the symbol for feet. I have the same issue pulling from a last name field in other tables. (Like O'Connor)
select descrip into v_result from c_ship_hist where shipment_dtl_id = :SDID; exception when others then null;
The error I get is "Missing right quote". How do I code around this issue without having to change the data?
presenting the case as follows:There are two dates with time components like
26-sep-2010 13:00 and 29-sep-2010 19:00
In between these dates hours between 20.00 to 05.00 (night hours)need to be considered and In these night hours less than three hours can be ignored and between 3 to 9 hours should be treated as 1. Need the number of one's in between the dates.
Procedure, cursor solution is not needed and need single select statement.
I want to run multiple IF Else statements in a single select SQL, each statement is one SQL operating on the same table, what is the best way to write this select SQL query ? If it is PL/SQL, when i get the result from the first IF statement I will skip the remaining execution, and so on..
I want to merge the following two sql statements into single output.
select id,count(*) from derailed where changed_on between to_date('26-july-13 18:30:00','DD-Mon-YY hh24:MI:SS') and to_date('01-August-13 18:29:00','DD-Mon-YY HH24:MI:SS') group by id;
how can i track the exception for three select statement in one pl-sql block. here is synario.......
begin select * from emp where empno=1234; --statement 1 select * from cusotmers where cust_id=125; --statement 2 select * from products where product_id='a-3'; --statement 3 end;
i want to track exception any one for ex no_data_found for all these three different statement.
I know if i put this three statement in three different pl-sql sublock then i can trap it....
Is there a technique to getting a Top-N query to work as a sub-select in a larger query -or- is there another way to generate Top-N like results that works as a sub-select?
Background:
We have a large query that is being used to build an export from a legacy HR system to a new one. Amount the data needed in the export is the employees primary phone number.
The legacy HR system allows multiple phone numbers to be stored in a simple table structure:
SELECT emp_id, phone_type, phone_number FROM employee_phones
The new HR system does allow for multiple phone numbers, however they need a primary phone number identified and stored with the employee master information. (Subsequent phone numbers get stored in alternate table.)
From a business perspective, we have decided that if they have a HOME phone in the legacy system that should be the primary in the new system, if no HOME phone, then WORK, if no WORK then CELL.
That can be represented as:
SELECT * FROM employee_people_phones WHERE emp_id = '46021' ORDER BY decode(phone_type, 'HOME', 'a', 'WORK', 'b', 'CELL', 'c', 'z')
SELECT * FROM (SELECT * FROM employee_people_phones WHERE emp_id = '46021' ORDER BY decode(phone_type, 'HOME', 'a', 'WORK', 'b', 'CELL', 'c', 'z')) results WHERE ROWNUM = 1
SELECT phone_number FROM (SELECT phone_number FROM employee_people_phones WHERE emp_id = '46021' ORDER BY decode(phone_type, 'HOME', 'a', 'WORK', 'b', 'CELL', 'c', 'z')) results WHERE ROWNUM = 1
phone_number ------------------- 1111111111
However, when the Top-N query is added as a sub-select in a larger query using the employee id from the larger query (WHERE emp_id = export.emp_id), it fails saying that �export.emp_id� is not a valid id.
(SELECT phone_number FROM (SELECT phone_number FROM employee_people_phones WHERE emp_id = export.emp_id ORDER BY decode(phone_type, 'HOME', 'a', 'WORK', 'b', 'CELL', 'c', 'z')) results WHERE ROWNUM = 1)
1.Any way around this? Is it possible to put a Top-N (with a WHERE clause using data from the main query) in a sub-select?
2.Any alternatives (other than Top-N) to delivering a ROWNUM=1 result with a �custom� ORDER BY statement?
Other Notes: Yes, we know we could do two queries in the data conversion first deliver the bulk data to the target table, and then update with the phone numbers. However, for multiple reasons, that is less than desirable.
I want to get any employee name of deptno 10 but total count of number of employees under dept 10.
DECLARE l_deptno NUMBER:=10; l_count NUMBER; l_ename varchar2(20); BEGIN SELECT count(*) OVER(order by empno) ,ename INTO l_count,l_ename FROM emp WHERE ROWNUM=1 and deptno=l_deptno; dbms_output.put_line(l_count||' '||l_ename); end;
I have four employee types such as 'C' for consultants, 'S' for staffs, 'W' for workers ,, ('E','S','W') for all types of employees. i have write four queries for showing four types of employees. can it is possible in a single query.
I have written this in oracle forms . I have taken a list item for workers i have taken 'W' , for staffs i have taken 'S' , for consultants i have taken 'C' and for all i have taken 'A'. my column name is emp_type in( :block.list_item ) but it is not taking the value from the list item when the value is emp_type in('C') etc etc..
like this for workers ,staffs . when it is 'A' it will take emp_type in ('E','S','W')
I want to replace below multiple call to procedure with a Single query. Currently this proc is getting called multiple times from application.
FUNCTION f_get_shows_info(i_booking_wk_id IN NUMBER, i_screen_id IN NUMBER) RETURN VARCHAR2 IS v_act_shows booking_wk_screen.act_shows%TYPE; v_expected_shows booking_wk_screen.expected_shows%TYPE; v_return VARCHAR2(50); BEGIN SELECT NVL(act_shows, 1), NVL(expected_shows, 1) INTO v_act_shows, v_expected_shows FROM booking_wk_screen WHERE booking_wk_id = i_booking_wk_id [code]...
Is there anyway through which we can achieve this in Oracle 10g.
how does this query execute? what kind of a query is this called?
mysql> select ename,(select dname from dept where deptno=e.deptno ) as dname -> from emp e;
+--------+------------+ | ename | dname | +--------+------------+ | SMITH | RESEARCH | | ALLEN | SALES | | WARD | SALES | | JONES | RESEARCH | | MARTIN | SALES | | BLAKE | SALES | | CLARK | ACCOUNTING | | SCOTT | RESEARCH | | KING | ACCOUNTING | | TURNER | SALES | | ADAMS | RESEARCH | | JAMES | SALES | | FORD | RESEARCH | | MILLER | ACCOUNTING | +--------+------------+ 14 rows in set (0.00 sec)
summer_course_completed | winter_course_completed | user_id | attendance ------------------------------------------------------------------------ y | n | 2 | 20 y | n | 2 | 40 y | y | 2 | 30 n | n | 3 | 20 n | y | 3 | 60
I wish to list each student's name with the number of summer courses he has completed and the number of winter courses he has completed. I am trying this :
select u.name, count(*) from user u, course_user cu where u.id=cu.user_id and cu.summer_course_completed = 'y' group by u.id;
but I can get only the number of summer courses OR the number of winter courses that each student has completed, but never both simultaneously, through a single query. Is there a way to do that ?
