PL/SQL :: One To Many Relationship In A Query Via Join
Oct 11, 2013
I have been told to create a query which should give out the same output as the UI of an exception management application . However , many referenced tables have one to many relationship . I created a query using a function which was giving the required output . But the performance of the query was not good as for each row . Is there a method to create a select using joins to show one to many relationship in a table .
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Nov 13, 2011
The existing format of the records are
MCF_ID MCF_PRDGRP MCF_BSCNME MCF_BSCSUP MCF_CRDNME Cno
------ ---------- ---------- ---------- ---------- ---
41956 1001 LIM KOK HWA Base LIM KOK HWA 101
41957 1102 CHEN ZHEN Base CHEN ZHEN 102
41958 1102 CHEN ZHEN Sub CHEN HONGJIAN 103
41960 2007 CHEN ZHEN Base CHEN ZHEN 104
41961 2007 CHEN ZHEN Sub CHEN HONGJIAN 105
41968 2108 WEE LIANG Base WEE LIANG 106
41969 2108 LOW KAH Sub LOW KAH 107
This should be modified as below.
MCF_ID MCF_PRDGRP MCF_BSCNME MCF_BSCSUP MCF_CRDNME Indicator Sub Name baseCno SubCno
------ ---------- ---------- ---------- ---------- ---------- -------- ------ ------
41956 1001 LIM KOK HWA Base LIM KOK HWA 101
41957 1102 CHEN ZHEN Base CHEN ZHEN Sub CHEN HONGJIAN 102 103
41960 2007 CHEN ZHEN Base CHEN ZHEN Sub CHEN HONGJIAN 104 105
41968 2108 WEE LIANG Base WEE LIANG 106
41969 2108 LOW KAH Sub LOW KAH 107
[Code]..
Throught this query, I get a extra record with null value in the Sub_name and Sub_Cno.update this query using a self join.
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Nov 2, 2012
I have an attendance table in which we have empno, time_in, time_out..etc.
I want to create a matrix report that should shows all dates of any specific required month in columns and present empno in rows and time_in in cells.
I did it with using a temporary table by filling all the required dates and outer join with attendance table, it works fine, but it takes so long, is there any other better fast way to do it?
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Nov 10, 2010
I have the following 2 tables.
A) Docversion
CREATE TABLE DOCVERSION
("OBJECT_ID" VARCHAR2(250 BYTE),
"OBJECT_CLASS_ID" VARCHAR2(250 BYTE),
);
[Code]..
Join column : object_id and parent_id.
The object id in docversion will have multiple values for element value in listofstring table.
ordinal value represents teh sequence of element value
Eg:
data for docversion:
1 23
2 34
data for LISTOFSTRING:
1 11 0 100
1 11 1 109
1 11 2 119
2 22 0 A
2 22 1 B
ouptut:
I want the output as follows
docversion.objectid,listofstring.elementvalue
1 100,109,119
2 A,B
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Jun 26, 2012
How to update single table column using join query
Example:
Update table1 t1,table2 t2
set t1.column2 = 'Y'
where t1.column1 = t2.column1
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Oct 26, 2011
I have come across a join in a query which has the (+) symbol at the end of it.
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Feb 27, 2008
In my Oracle 9i Schema, I have two tables:
Table One
pocOne pocTwo
2 3
2 4
1 2
Table Two
TableTwoId Name
1 Jones
2 Smith
3 Edwards
4 Camden
My SQL to fetch all records with Smith works great:
select Name from TableTwo
Inner Join TableOne
on TableTwo.TableTwoId in (TableOne.pocOne, TableOne.pocTwo)
where Name = 'Smith'
Now I need to create an alias for the Name field. Here is my attempt:
select myAliasName from TableTwo
Inner Join TableOne
on TableTwo.TableTwoId in (TableOne.pocOne, TableOne.pocTwo),
(select Name as myAliasName from TableTwo)
where myAliasName = 'Smith'
This attempt pulls up all the records instead of just Smith records. How I can create an alias for the Name field in my above query?
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Sep 10, 2012
I want to convert join to subquery. how cna i do this.
FROM
TABLE_1 A
INNER JOIN TABLE_2 B
ON ( A.COL_1 = B.COL_1)
[Code]....
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May 19, 2011
TABLE - 1
CIDDOB(DATE)
12312-MAR-63
58918-JAN-78
658927-DEC-43
46515-FEB-80
TABLE - 2
DIDDOB_INFO(VARCHAR2)
34425 Mar 1967
123 12 MAR 1963;25 FEB 1974;25 AUG 1978
46515 FEB 1980
I want to join the columns DOB from table -1 and DOB_INFO from table 2 but the datatype of DOB is DATE and DOB_INFO is VARCHAR. TO_DATE function is not working here.
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Dec 2, 2010
the following statement gives each customer owns how many promotions.
Q:) how do i retrieve a customer who has max. promotions?
SELECT C.CUSTOMER_ID,COUNT(P.PROMOTION_ID)
FROM PROMOTIONS P,CUSTOMERS C
WHERE C.CUSTOMER_ID = P.CUSTOMER_ID
GROUP BY C.CUSTOMER_ID
=====================================================
CUSTOMER_ID COUNT(P.PROMOTION_ID)
-------------------------------------
001 | 5
002 | 8
003 | 4
004 | 6
005 | 5
006 | 3
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Dec 14, 2010
In SQL, almost all the thing which are possible with join is possible with sub-query also and vice-a-versa.
So when should I use sub-query and when should I go for join?
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Jun 27, 2013
How to use outer join condition in my below query. In the table APPS_JP.GEDIS_OFFER_HEADER goh I have more records in the table APPS_JP.GEDIS_ORDER_BUILDS gob I have less number of records.
I want all the records from APPS_JP.GEDIS_OFFER_HEADER goh including other conditions. I have tried goh.OFFER_NO=gob.OFFER_NO(+) but same result.
SELECT GOH.ORIG_SYSTEM,
gsp.USER_NAME,
goh.ORDER_NO,
goh.OMEGA_ORDER_NUMBER,
goh.ORDER_TYPE,
[code].......
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Jan 20, 2011
joining this query instead of using the left join. Reason is want to show the score column in a different place and also do not want to show the second IPS column that is used in the joined query.
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
select * from
(
select i.ips,
p.project_name,
p.project_segment,p.location,p.project_exec_model,
p.project_exec_model||' - '||p.project_config pmodel,
one.score schedule,two.score cost,three.score execution,four.score commercial,
nvl(one.score,0)+nvl(two.score,0)+nvl(three.score,0)+nvl(four.score,0) as total,
[code]....
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May 13, 2013
I saw a strange plan for one query in TESTING DB today. Although 2 tables are involved i dont see any join , NL/HJ/SMJ !! i am not facing any performance issue but curious to know what type of optimization oracle is doing here.
Query text and plan :
SELECT FIRST_NAME
FROM CAMPA.TABLE_A
WHERE NAME_ID =
(SELECT NAME_ID
FROM CAMPA.TABLE_B
WHERE ban=:b1);
[code]....
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Oct 24, 2012
must generate a Cartesian join, but I do not know why it happens. dt.debtorkey, cl.clientkey, inv.invoicekey, ag.agingkey are primary keys of each table. The problem is: I got same tuple for 8 times.
select dt.debtorkey, cl.clientkey, inv.invoicekey, ag.agingkey, dt.DebtorNo, dt.Name as "debtor Name", dt.State, cl.ClientNo, cl.Name as "Client Name", inv.InvNo, inv.PurchOrd, inv.Amt,
to_char(inv.InvDate, 'MM-DD-YY') invoice_date, to_char(ag.DateLastBuy, 'MM-DD-YY') aging_lastbuy, to_char(ag.DateLastPmt, 'MM-DD-YY') aging_lastpmt
[code]...
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Nov 16, 2012
I've seen this example numerous places, and tried to implement it, but I keep getting an "invalid identifier" error message, despite the fact that I've got the table and column specifically identified.For instance, my query reads like:
UPDATE tbl1
SET tbl1.EMPID =
(SELECT tbl2.EMPIDA FROM tbl2
WHERE LOWER(tbl1.EMAILCOL) = LOWER(tbl2.EMAILCOL2)
)
WHERE tbl2.EMPIDA IN ('Z1O435','S8M4722','M0D5156')
AND EXISTS
(SELECT tbl2.EMPIDA
FROM tbl2
WHERE tbl1.EMAILCOL= tbl2.EMAILCOL2 );
But I'll keep getting flagged at the tbl2.EMPIDA column reference. I have not tried this in SQL Plus, just in TOAD, but it seems to repeatedly fail.I have had to dump records to standalone Access tables and link back to perform the updates.
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Jun 16, 2011
I have two tables. By joining these two tables, I need to update a field in table1.
UPDATE table1
SET table1.FLAG = 'Fixed'
where table2.lastname = table1.lastname
and table2.status in ('fulltime','parttime')
I keep getting error 'table1.lastname' is invalid identifier.
I can't understand the error message. I made sure that the fields exist.
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Jul 23, 2013
The full statement is:
SELECT v.key$ FROM VERSION_TABLE v, DOCUMENT_TABLE d, CLASS_TABLE z WHERE
v.documentKey = d.key$ AND
d.classKey = z.key$ AND
z.key$ IN (SELECT zz.key$ FROM CLASS_TABLE zz
START WITH zz.name = 'esDTTemplate'
CONNECT BY PRIOR zz.key$ = zz.parentKey) AND
v.ESGROUP = 'SearchOperatorsMapping' ORDER BY d.name
Now I noticed that the subquery is never used to seed the join: indexes - if any - are used. Otherwise a full table scan is performed.In the example - if ESGROUP is indexed, then it's chosen to start the join evaluation. If not, a full table scan is performed.Is there any way to suggest to the optimizer to use the subquery in case there are no indexes - as a fallback ?
In the above example where VERSION_TABLE contains nearly two million records, the no index solution takes 60 secs. vs. less than 1 sec. in the index case.Wrapping the hierarchical query in a inline view leads to same result.
PS: the execution plan (without index) is:
-------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
-------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 9 (100)| |
| 1 | SORT ORDER BY | | 1 | 171 | 9 (23)| 00:00:01 |
|* 2 | HASH JOIN SEMI | | 1 | 171 | 8 (13)| 00:00:01 |
[code]...
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Jun 22, 2011
I have this table
create table ACTIONARI_ARH
(
actionar_id NUMBER(10) not null,
id VARCHAR2(20) not null,
id_2 VARCHAR2(20),
tip VARCHAR2(1),
nume VARCHAR2(100),
prenume VARCHAR2(100),
adresa VARCHAR2(200),
[code]....
and this view
CREATE OR REPLACE VIEW ACTIONARI AS
SELECT "ACTIONAR_ID","ID","ID_2","TIP","NUME","PRENUME","ADRESA","LOCALITATE","JUDET","TARA","CERT_DECES","DATA_REGISTRU" Data_operare,"USER_MODIF","DATA_MODIF","REZIDENT"
FROM (
select
[code]....
The table has about 30 milion records and holds persons names, addresses, personal id (id), and internal id(actionar_id) and date when a new adress has been added.
The view is about getting only the most recent info for one person (actionar_id).
if i run a
a) select * from actionari a where a.actionar_id = 'nnnnnnn', result is returned immediatly, oracle uses index and does not do a full table scan.
b) select * from actionari a where a.actionar_id in ('nnnnnnn','mmmmmm','ooooooo'), result is returned immediatly, oracle uses index and does not do a full table scan.
my problem when i use this view in a join.let's assume i have another table with no more than 500 records, something like
create table SMALL_TABLE
(
actionar_id NUMBER(10) not null,
......
);
and if i run
select *
from SMALL_TABLE s
join actionari a
on a.actionar_id = s.actionar_id;
it takes like forever to process, forever means 1~3 minutes.by looking at the execution plan, oracle does a full table scan, creates the view for all unique 7milion persons, and only then joins the result with the actionar_is's in the small table and returns the desired 500 record result.i am using oracle 10g.
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Nov 15, 2010
I have constructed a cross join query, with the test case below
create table ajit_sites (
site_id char(1));
insert into ajit_sites values ('A');
insert into ajit_sites values ('B');
insert into ajit_sites values ('C');
COMMIT;
sql below is constructed to display combination of all sites (cross-join), it also removes records where "origin" is the same with "dest"
select
a.site_id origin, b.site_id dest
from
(select site_id from ajit_sites) a,
(select site_id from ajit_sites) b
where
a.site_id <> b.site_id b
Is there any way i could remove records with the behavior below
Origin , Dest
A , B
B , A
For instance from the example above, i want to only retain one of the records since record (A, B) or record (B, A) means the same.
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Apr 5, 2013
How Can I delete the returned two rows?
1 select s.reg_no,s.course_code,
2 s.section src_sec,a.section a_sec,a.att_date,a.att_flag
3 from attendance a ,src s
4 where a.semester_code=1
5 and a.semester_year=2013
6 and s.semester_code=1
[code]....
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Oct 18, 2012
I want to know how many managers have employees under him?
I mean to say one manager may have multiple employees from employees table.
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Mar 7, 2013
I have one RDBMS concept question.if i have 2 tables with 0 to many realtionship. can i create referential integrity constraint between them?
In other words how can i tell whether the records in table A(child table) are not orphan records and have 0 to many relationship with table B(parent table) ? Right not there is no constraint defined on both tables.
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Apr 29, 2011
I've a table (RelationshipX) with two columns with following values. The table represents the relationships. When I run the following query, It will give me all the combination of relationships...however, I need to get 15 unique as defined below.
Col1Col2
1106011060
1106011640
1106011142
1106011095
1106013029
1106014058
I run the following query to get below of all the combinaiton (note, I am opting out those six rows which matches to each other) select a.Col2 as Col1, b.Col2 as Col2 from RelationshipX a, RelationshipX b
where a.Col1 = 11060
and a.Col1=b.Col1
and a.Col2 <> b.Col2
order by Col1, Col2
[code]....
HOW can I modify my SQl so I get only 15 unique relationship records. (For example two UNDERLINE rows are technically same, and there are total 15 of them)???.
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May 13, 2011
Just wanted to pose a question Can a (Unique and Not nullable)Alternate key of the parent table be part of child Table in an Identifying relationship i.e part of primary key of a child table????
Is there a rule that a primary keys of a parent table can be used to build a identifying relationship with its child?
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Apr 27, 2010
I have a table which has 2 one to many relationships like a tree structure in the same table, is there a way that I can show the same on the form and be able to do the insert and update on the same table?
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Mar 6, 2011
Quote: Originally Posted by Silverj2k11
ALTER TABLE CONTRACT
ADD FOREIGN KEY (client_id)
REFERENCES client(client_id);
Didn't work! I am now losing my mind.
ORA-00904: "CLIENT": invalid identifier You do have a table named CLIENT?
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Feb 6, 2012
Would there be any problem / error when we import the dump file (which has parent table) on target database ?
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Feb 24, 2007
the relationship on my script.What I want to do is make it possible to assign many courses to a student.But I have read a few books on foreign keys and primary keys, and I still dont get how to go on doing this....
This is how the table creation with the keys looks right now...
CREATE TABLE CAMPUS (
CAMPUSID NUMBER(4) NOT NULL,
NAME VARCHAR2(80) NOT NULL,
CONSTRAINT CAMPUS_PK PRIMARY KEY (CAMPUSID));
[code]...
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Aug 8, 2011
I have a table called FAMILY which holda the data like , for father_gen_1 --->father_gen_2 --> father_gen_3 -- son.
father_gen_1 father_gen_2 father_gen_3 son
ABC XYZ GEF MNC
ABC lmn kth
I want to get the output which is a three column heirarical table and holds the parent child relationship Like following:-
id name parent_id
1 ABC NULL
2 XYZ 1
3 GEF 2
4 MNC 3
5 LMN 1
6 KTH 5
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