SQL & PL/SQL :: Select With Order In Self-reference Table?
Jun 25, 2012
I have the following table:
CREATE TABLE test_A(member_id NUMBER(2) PRIMARY KEY, MEMBER_name VARCHAR2(20), MEMBER_parent NUMBER(2) DEFAULT NULL);
INSERT ALL
INTO test_A VALUES (1, 'mem1', NULL)
INTO test_A VALUES (2, 'mem2', NULL)
INTO test_A VALUES (3, 'mem3', NULL)
INTO test_A VALUES (4, 'mem4', 1)
INTO test_A VALUES (5, 'mem5', 1)
[code]....
As the actual data is huge, I need to know the best (least expensive) way to select each parent and then all its direct child ordered by member_id the output should look like:
Name Null Type --------------------------- -------- ------------- RPTNO NOT NULL NUMBER RPTDATE NOT NULL DATE RPTD_BY NOT NULL VARCHAR2(25) PRODUCT_ID NOT NULL NUMBER
describe rptbody
Name Null Type ------------- -------- ------------- RPTNO NOT NULL NUMBER LINENO NOT NULL NUMBER COMMENTS VARCHAR2(240) UPD_DATE DATE
The fact is that we store some header in RPTHEAD and store real data in RPTBODY, the question is that if I use below SQL to query all data for a 'PRODUCT_ID'.
SELECT t0.LINENO, t0.COMMENTS, t0.RPTNO, t0.UPD_DATE FROM RPTBODY t0 , RPTHEAD rpthead WHERE ( t0.RPTNO = rpthead.RPTNO AND t0.UPD_DATE>=to_date('1970/01/01 00:00:00','YYYY/MM/DD hh24:mi:ss') AND rpthead.PRODUCT_ID IN ('4647') )
I do not want to have 'ORDER by' clause since data set is too large, the sorting takes long time, is there any way to get the result rows in the order sorted by RPTNO? We have the index for RPTNO on RPTBODY.
Select clause or Order by clause? First the columns specified in the select clause are fetched and then ordered or is it the vice -versa? In a query if a psuedo-column rownum is selected, then if we use order by on the rownum column, what happens?
What would be the output of the following query and why?Which part of the query is first executed, is it select clause or order by clause?
select empno,ename,rownum from emp order by rownum desc;
if when you are querying a table in 11g and you use the order by clause and there is more than one occurrences with the same values in the order by, if the 11g default is different than from 10g.
For instance.
DECLARE MHBulk CURSOR FOR select invoice_nbr, customer_nbr, post_century, post_yymmdd, from CUSTOMERS where customer_nbr = 1234 order by post_century, post_yymmdd;
If you have more than one occurrence of the same customer_nbr, post_century, and post_yymmdd
it looks like the default order for how 11g retrieves the records is a bit different than the 10g default.
currently i m going through some dumps for my OCA-11g prep.I came across one sentence :A view cannot have an ORDER BY clause in the SELECT statement.well this statement is false and the explanation given was :
Query operations containing ORDER BY clause are also permitted, so long as the ORDER BY clause appears outside the parentheses.
The following is an example of what I mean: CREATE VIEW my_view AS (SELECT*FROM emp) ORDER BYempno.
but when i tried running the query like this :CREATE VIEW my_view AS SELECT*FROM emp ORDER BYempno ,it worked w/o giving parentheses.
Table1:event_channel Table2:event_inst I have to update event_channel one column with 4 record(channel_type_id,values 1,2,3,4) with respect to one record of event_inst table column(event_instance_id). event_inst table column(event_instance_id) has respective 4 records in event_channel
I have two tables A and B. In table A there is a field which contains a string of 20 characters; this essentially holds 5 codes of 4 characters each.
Table B is a reference table. It holds the 4 character code and the description.
I am trying to run a select query to bring back the description of the code for the first 2 codes in table A but i am not sure how to bring back the descriptions! The below is what i am trying to achieve.
I have a table DW_ORDER_CHANNEL and I need to know what are the other objects accessing this table. As i need to alter this table so the dependent objects get invalid. how to get the dependent object on this table?
There are 2 tables : Table A and Table B.Table B has foreign key reference to Table A.There are 2 forms in the application based on table A (form 1) and table B (form 2).
Now when we open form 2, the functionality is such that it acquires a lock on table B for the selected record during the search criteria. Lock is acquired by using "select 1 from table_B where column = :column for update no wait".So when the form 2 is opened by any other user/session and same record is tried to be selected, then an exception is raised to the user that the current record is being edited by some other user and does not allow him to edit that record.
Now imagine if User has opened screen 2 (One record in Table B has been locked). With this lock existing, we open form 1, and click a button which performs a COMMIT_FORM. At this point the form hangs. On checking the locked objects, there is a lock on both table A and table B. When the Form 2 is closed, then the Form 1 which was hanging a while ago starts responding.
When the foreign key relationship is dropped and the above scenario is tried, there is no issue encountered. Form 1 works fine even if form 2 is open.We are not supposed to drop the Foreign key relationship as well.
I have csv file which having parent and child related data.i need to load parent data in to parent table and get parent reference id and store in child table with child data. i am not able to find how to get parenet refernce id using control file. In my csv file i have 2 parent name rows. I need to create one A record in parent table and get that parent primary(P_ID) for 'A' record and put into child table for c_name test1 and test2 records.
My controll file ------------------- LOAD DATA INFILE 'mydata.data' APPEND INTO TABLE parent when (1:1) = 'p' fields terminated by ',' optionally enclosed by '"' trailing nullcols
[code].....
able to load parent data and generate P_ID, but i am not able to get P_ID for child records.
I know the only way to guarantee a specific sort order result when querying table is by using the order by clause. However, I have an issue where I do not have access to the code for the web user interface of a very lightly used interface (has two users). In that user interface is a drop down box that is populated by a table - one table. The drop down box is populated by the query "select [column name] from [table name]". Right now there are 400+ rows in that table total, so it's small but not having the items ordered is a pain.
I would like to alter something on the db side so the result of "select [column name] from [table name]" is an ordering by the column descending. I don't want the sort order to be the same for all queries (including joins and all) just want to control the order for that one query. It is Oracle9i.
I would like to reorganize a table inorder of primary key but I'm not sure if I'm expecting the right thing from dbms_redefinition package.
I am working on oracle 9i 9.2.0.8
I have the following table :
SELECT * from SCOTT.TESTTABLE ID REF ---------- ---------- 1 FF 2 BB 3 CC 4 DD 8 EE 6 ZZ 7 YY 5 GG
when I use the CODEexec dbms_redefinition.start_redef_table('SCOTT', 'TESTTABLE', 'TESTTABLE2', 'id id, ref ref', dbms_redefinition.cons_use_pk);
Would the newly created scott.testtable be created in order of primary key (ID) thus a select * from scott.testtable will give me an ordered result?
When I do the test, the table before and after the redefinition is exactly the same so why use the CONS_USE_PK if it doesn't order the table by primary key?
I have data that i am sorting, the data is mostly numeric (format of XXX-1234). is there any way to have my query sort xxx-1000 AFTER xxx-999? right now i am thinking i will have to create a separate sort order column on my table.
I have to find the next EMP whose MAX_SQUENCE needs to be updated with a sequence. In this case the next would be '010' I fetched the EMP who falls after the max value of the column max_sequence in order of EMPCODE.
select emp_next from ( SELECT emp,max_sequence, LEAD(emp, 1, 0) OVER (ORDER BY emp) AS emp_next from test_emp_wip where wip > 0 ) where max_sequence=(select max(max_sequence) from test_emp_wip where wip > 0) EMP_NEXT 010 After sometime, the record would look like :-
Order OrderID Status OrderItems OrderID EAN Amount Store EAN Amount
now,I need trigger that will on updating table Order and changing status to "GoodsReceived" increase amounts in Store according to values in OrderItems.
create or replace trigger order_received_trigger before update on Order for each row begin if (:old.status=4 and :new.status=1) then /* select ean, sum(amount) from OrderItems where OrderID=:old.OrderID group by ean; */ end if; end;
but now i dont know how to apply that select on table Store.
select * from test_1 IDNameTotal ----------- 1A100 2B100 3C100 4D100
test_2 table contains the concatination of ID's with comma seperated. Actually in this table ID column is of datatype varchar2. select * from test_2 ID ---- 1,2,3
My requirement is to select the data from test_1 table where the id values in this table exists in test_2 table. I tried with the belowselect statement, but could not get any data.
SELECT * FROM test_1 WHERE to_char(id) IN (SELECT id FROM test_2)
create table test_1 (id number, name varchar2(100), total number) create table test_2(id varchar2(100)) insert into test_1 values (1,'A',100) insert into test_1 values (2,'B',100) insert into test_1 values (3,'C',100) insert into test_1 values (4,'D',100)
I am working on an application that requires very dynamic access to data. Users will build queries through the interface and the queries will be stored in VARCHAR fields for later use. The function that later uses the query has no way of knowing the field names or data types used in the selection query.
This isn't an issue in any program language that I have used before but in this case, we want to do this in a package within Oracle rather than an external application.
how to reference a field by its location or position in the query.
We need to get the list of fields so we know what each field is named and we need to be able to get at its value dynamically as well. If possible, checking the data type would be useful too but that is less important in this case.If we were doing this in say PHP, we could simply reference the query row and use a command like...
foreach($myrow as $field=>$value)
and this would walk through each field in the row giving us the field name and its value.We need to do this same type of thing in our package.
I simulated a sample procedure for my requirement.When i try to compile procedure it throws error 'cannot mix single and multiple rows ( bulk) into'...I have to pass a table as dynamic in a cursor ,collect the data and process it using and forall.
insert into dynamic values ('Mike','1','123456'); insert into dynamic values ('Nike','2','1234567');
create or replace PROCEDURE proc_1(t_name varchar2) IS TYPE parent_rec IS RECORD (part_num dynamic.emp_name%type,part_name dynamic.emp_id%type,part_id dynamic.tel_no%type) ; p_rec parent_rec; rec_array SYS_REFCURSOR; BEGIN OPEN rec_array FOR 'select EMP_NAME, EMP_ID,TEL_NO FROM '||t_name ||' WHERE EMP_ID = ''1''' ; [code]....
I use some quantity of functions with list of account id like in example below. Some functions use the same account id list, some use another. Everything works fine except those days when changes come and lists should be updated. Then I should edit each function... I think about creating new table for reference list like
CREATE TABLE MYREFERENCELIST AS SELECT XXXX AS ACCOUNTID, YYYY AS LIST1 FROM DUAL UNION ALL SELECT ZZZZ AS ACCOUNTID, UUUU AS LIST2 FROM DUAL
FUNCTION ACCOUNTID (arc_date date, cid number ) RETURN NUMBER AS [code]..........
