SQL & PL/SQL :: Mechanism Of Self Join Table
Jun 11, 2010
Explain the mechanism of this sql statement. I tried to understand how it goes but I really got confused.
select e.last_name, m.last_name mgr
from employees e join employees m
on (e.manager_id = m.employee_id)
The first line seems clear to me that will bring the names of employees and second column will bring names of managers. Second line is clear as well, but the third line couldn't understand. in my mind it should be like that
m.manager_id = e.employee_id
I tired this but doesn't work so what happened exactly in that full statement, I mean how it will match. I just want to understand the mechanism.
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Mar 14, 2011
I have a question about system logon / logoff triggers that can provide a tracking mechanism for Oracle user activity you've described:
[URL].......
If this approach is good for high-concurrency OLTP databases?
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Jul 30, 2012
I stumbled about some weird 11gR2 behavior (running on AIX).When I performed a join between a table with user based content (parts belonging to an sourcing scope) and a base table (parts available) whereas the parts have to fulfill a special regular expression, it showed that the same query is faster when using outer join than inner join (about 0.7sec vs. 20sec; which makes me believe that regexp_like works wrong when involved in an inner join).
i tried the same statement with a standard like (but not fulfilling the same condition).This time performance was as expected (inner join outperforming outer join).
Oracle version information
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE 11.2.0.2.0 Production
TNS for IBM/AIX RISC System/6000: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production
[code]...
I can see it, the execution plan for the "inner join" doesn't show so much more costs than the one for the outer (but why at all is does an inner join cost more?) ...The execution plan for both "not like" is the same and (surprisingly ;-) ) similar to "outer-regexp".
I hope sample data are not needed as there would be needed a lot...this is the second time I came across the "plan worse but execution time better" phenomenon.
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Jul 18, 2012
I am trying to join column names from a table with data from a different table. I think i should be able to pass the parameter to a 'select list' in a query. Look at my sample data below. And the data in sales table can grow till 15 rows and similarly corresponding columns in saleshist.
CREATE TABLE SALESHIST
(
PRODUCT VARCHAR2(30 BYTE),
Q1 VARCHAR2(30),
Q2 VARCHAR2(30),
Q3 VARCHAR2(30),
Q4 VARCHAR2(30)
)
[code]......
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Sep 19, 2011
I am having trouble retrieving the Max, latest date, from a table with a join to one another table and other fields from both.I was able to get the MAX service_date grouped by id. But once I tried to add more fields to the query and another table it won't work.
Here is what I have:
selectMAX(cs.service_date), cs.notes, cs.applicant_id,wr.program_code,wr.last_name,wr.first_name,wr.region_code,wr.status_cd
from cs join wr on cs.applicant_id=wr.applicant_id
where wr.status_cd='AC'
group by cs.applicant_id
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Nov 1, 2010
I have two table in different instance .
IMEI in instance A
RCA_SMART_CARD in instance B
Below is the desc table :
SQL> desc RCA_SMART_CARD;
Name Null? Type
----------------------------------------- -------- ----------------------------
N_CARD_ID NOT NULL NUMBER(10)
C_CARD_SERIAL_NUMBER NOT NULL VARCHAR2(20)
C_SIM_MSISDN VARCHAR2(20)
C_SIM_IMSI VARCHAR2(20)
C_LINKED_CARD VARCHAR2(20)
N_PRO_IDENTIFIER NOT NULL NUMBER(4)
C_CARD_TYPE VARCHAR2(1)
N_SIM_STATE NUMBER(1)
N_EEPROM_SPACE_LEFT NUMBER(9)
N_VOLATILE_SPACE_LEFT NUMBER(9)
N_NONVOLATILE_SPACE_LEFT NUMBER(9)
N_CARD_OPTI NOT NULL NUMBER(15)
N_PRODUCT_ID NUMBER(10)
D_CREATION_DATE DATE
D_MODIFICATION_DATE DATE
D_STATUS_MODIFICATION_DATE DATE
SQL> desc IMEI;
Name Null? Type
----------------------------------------- -------- ----------------------------
MSISDN NOT NULL VARCHAR2(20)
IMEI NOT NULL VARCHAR2(16)
DATE_MOD NUMBER(13)
IMSI VARCHAR2(18)
ICCID VARCHAR2(20)
T_PROF RAW(20)
EXTRA_DATA VARCHAR2(100)
If I want to join two table together . I want to search the number of record in IMEI that have N_SIM_STATE =1 in RCA_SMART_CARD . The MSISDN in IMEI is equal to C_SIM_MSISDN in RCA_SMART_CARD .
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May 17, 2010
oracle 10g to select column from about 8 table . I start with this statement
select A.a, B.b, C.c, D.d, E.e, F.f, G.g, H.h
from A
full outer join B on(A.a=B.b)
full outer join C on(B.b=C.c)
full outer join D on(C.c=D.d_
.
.
..
.
.
.
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Aug 16, 2010
two history tables with each record having effective date and end date needs to join (date is in dd/mm/yyyy)
table one
effdate enddate ID Name
01/08/2010 04/08/2010 01 devendra
04/08/2010 06/08/2010 01 deven
table two
effdate enddate ID Family
01/08/2010 02/08/2010 01 X
02/08/2010 03/08/2010 01 Y
03/08/2010 05/08/2010 01 Z
05/08/2010 06/08/2010 01 W
Expected output
effdate enddate ID Name Family
01/08/2010 02/08/2010 01 devendra X
02/08/2010 03/08/2010 01 devendra Y
03/08/2010 04/08/2010 01 devendra Z
04/08/2010 05/08/2010 01 deven Z
05/08/2010 06/08/2010 01 deven W
what can be optimum sql for this?
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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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Apr 12, 2010
I have a table that contains 15 columns. Say each columns contains name of fruits. And another master table which contains names of valid fruits. Now I have to create another table from these tables such that for each column if the fruit name is present in the master table then fruit-name is populated else "invalid" is populated. I know using left join for 15 times to the same master table can work. But I found this very clumsy. Is there any other way of doing it.This is just a sample case. In real scenario I have a table of 800 million records and master table of 30000 records.
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Mar 18, 2011
I have create a select statment using more then 10 table which is returning only two columns as per my requirement.
From this select statement I have create a View?
In order to proceed further first I would like to as If I can join a table and a view?
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Nov 1, 2010
I have two table in different instance .
IMEI in instance A
RCA_SMART_CARD in instance B
Below is the desc table :
SQL> desc RCA_SMART_CARD;
Name Null? Type
----------------------------------------- -------- ----------------------------
N_CARD_ID NOT NULL NUMBER(10)
C_CARD_SERIAL_NUMBER NOT NULL VARCHAR2(20)
C_SIM_MSISDN VARCHAR2(20)
C_SIM_IMSI VARCHAR2(20)
C_LINKED_CARD VARCHAR2(20)
N_PRO_IDENTIFIER NOT NULL NUMBER(4)
C_CARD_TYPE VARCHAR2(1)
N_SIM_STATE NUMBER(1)
N_EEPROM_SPACE_LEFT NUMBER(9)
N_VOLATILE_SPACE_LEFT NUMBER(9)
N_NONVOLATILE_SPACE_LEFT NUMBER(9)
N_CARD_OPTI NOT NULL NUMBER(15)
N_PRODUCT_ID NUMBER(10)
D_CREATION_DATE DATE
D_MODIFICATION_DATE DATE
D_STATUS_MODIFICATION_DATE DATE
SQL> desc IMEI;
Name Null? Type
----------------------------------------- -------- ----------------------------
MSISDN NOT NULL VARCHAR2(20)
IMEI NOT NULL VARCHAR2(16)
DATE_MOD NUMBER(13)
IMSI VARCHAR2(18)
ICCID VARCHAR2(20)
T_PROF RAW(20)
EXTRA_DATA VARCHAR2(100)
If I want to join two table together. I want to search the number of record in IMEI that have N_SIM_STATE =1 in RCA_SMART_CARD . The MSISDN in IMEI is equal to C_SIM_MSISDN in RCA_SMART_CARD .
How can I do and what is the sql statment ??
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Apr 28, 2010
I am little confused applying DISTINCT on a Multiple table Inner join.
Table: Role
=========================
role_id email
1 xxx@abc.com
2 yyy@abc.com
3 zzz@abc.com
Table: notification_role
===========================
id role_id process_id
1 1 p1
2 1 p2
3 1 p3
4 1 p1
5 2 p2
6 2 p2
7 2 p3
8 2 p3
9 3 p4
Table: process
================
process_id proces_name
p1 process1
p2 process2
p3 process3
p4 process4
Expected Result
====================
role.role_id role_email process_process_id process_name
1 xxx@abc.com p1 process1
1 xxx@abc.com p2 process2
1 xxx@abc.com p3 process3
2 yyy@abc.com p2 process2
2 yyy@abc.com p3 process3
3 zzz@abc.com p4 process4
QUERY::
select distinct c.process_id a.role_id,a.email_address,c.process_name
from role a, notification_role b, process c
where a.role_id=b.role_id and b.process_id = c.process_id
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Mar 1, 2010
I have 2 tables as shown below. I have to join those tables and get data as in table 3. Condition is I have to get sum of scores for each student where category is 1 and active is Y.
Table1:
col1col2category
A 10 1
A 10 2
B 10 1
B 20 2
C 10 1
D 20 1
J 30 1
Table2:
colAcolBActive
A10Y
A20N
B30Y
B40N
Z35Y
Table3:
STUDENTSCORE
A20
B40
C10
D20
J30
Z35
query to show student name and sum of his score where category is 1 and active is Y. I am using Oracle 8i.
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Nov 2, 2013
I have 2 tables Table a(girlscoutid, item, quarter)Table b(girlscoutid, fname, lname) I want to get the names of ppl who did not sell any item/s for the
4th quarter
girlscoutid item quarter7771
drinks 4QS9000
tickets 4QW7771
cookies 2QS5085books 3QF3010tickets3QW5085
cookies1QF lscoutid
fnamelname7771 jenn richochet9000 laura wilkins5085sally mae3010dora mckenzie
This is what I have, however, I get duplicates and also 7771 shows up on the list even though she sold an item on the 4Q.
SELECT fname, lname, a.girlscoutid
FROM a,b
WHERE a.girlscoutid = b.girlscoutidAND term NOT LIKE '4Q_';
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Aug 20, 2010
I've created a query so I can easily compare two sets of data for two different instruments:
select a.CalId, a.AtName, a.NRef, a.VaLoat, a.ValTime, a.ValRing,
cvs.NRef, cvs.CalId, cvs.AtName, cvs.VaLoat, cvs.Valtime, cvs.ValRing
from CalcAttribute a, CalcAttribute cvs
where a.NRef like '438815' and cvs.NRef like '438813'
and a.CalId *= cvs.CalId
and a.AtName *= cvs.AtName
union
[Code]...
This works great - however I want to add an addtional condition, basically so it only returns where the two are not equal.
I thought I should just be able to add an extra:
and a.ValLoat *<> cvs.ValLoat
and a.ValLoat <>* cvs.ValLoat
But it doesnt seem to like this (Incorrect syntax near '<'.)
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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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Aug 13, 2011
I need to delete all the registers where the table 1 does join with table 2 in 3 fields... for example:
delete taba1 t1
where t1.campo1 in ( select distinct(tr.campo1)
from tabla1 tr,
tabla2 t2
where t2.error = 0
tr.campo1 = t2.campo1
and tr.campo2 = t2.campo2
[Code]...
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Jul 2, 2012
join two oracle tables for fast fetch of data from table.
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Nov 10, 2010
I need to work on this requirement.
There are FOUR tables ( T1 , T11 & T2, T22) ALL store order information.
One of four conditions are possible for each Supply Reorder Number:
•Both table queries return no records
oPopulate all the output fields with nulls
•T1 returns a record, but T2 returns no records
oPopulate output fields with values from the join of T1 and T11.
•T1 returns no records, but T2 returns one record
oPopulate output fields with values from the join of T2 and T22.
•T1 returns a record, and T2 returns a record
oIf the latest order is in T1, then populate output fields with values from the join of T1 and T11.
oIf order dates are equal from both join results, then populate output fields with values from the join of T1 and T11 .
oIf the latest order is in T2, then populate output fields with values from the join of T2 and T22.
How do we filter the dataset based on result of table join ?
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Jan 18, 2013
I'm unable to get the below update SQL to run in Oracle, it's giving me th below error
ORA-00933: SQL command not properly ended.
UPDATE
PDR.PH_Family_Match_by_Chassis a
SET a.Launched = 'Y'
INNER JOIN
PDR.domCHASSIS
ON
a.chassis_id = PDR.domCHASSIS.chassis_id
[code]....
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Jun 15, 2013
I have 2 tables order_items and items.
Order_items Items
Item_id Item_id
Quantity Price
In normal sql statement: select sum(order_items.quantity*items.price) sales_price
from order_items,items
where order.item_id=items.item_id;
I have to put this logic in either a stored procedure or Function just to calculate sum(order_items.quantity*items.price) and store the aggregated value as Sales_price in DB. Then we have to call this from Informatica Stored procedure Transformation where we will have only one output port as Sales_price,this is to load into summary table. All the aggregate calculations and joining of 2 tables should be done on DB side and only one output should be populated when we execute this procedure.
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Oct 19, 2013
Lets say I have three tables t1 and t2 and t3.
SELECT * FROM T1;
Id
____
1
2
3
4
SELECT * FROM T2;
Id
____
1
SELECT * FROM T3;
Id
____
1
Now when data exists in T2 and T3, I want to return only the records in T1 that match the records in T2 and T3 which is basically a normal join
select t1.id from t1, t2,t3 where t1.id = t2.id and t1.id = t3.id
However when there are no records in T2 or T3, I want to return all records in T1 i.e 1,2,3,4
One way of doing that is using the not exists clause
select * from t1 where not exists ( select null from t2 where t2.Id != t1.id) and not exists ( select null from t3 where t1.Id != t3.id)
Is there a better way of doing this in sql ?
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Aug 14, 2009
i want to know the difference between Left outer join Vs. Right outer join? Its like which join is safer to use or is there any recommendations to use any join?
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Dec 25, 2007
i want to get table name, constraint name, constraint type with join processes in string type. this is what i want: alter table tablename add constraint constraintname constrainttype(columnname)
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Oct 15, 2012
I want to create a query with only the junction of these two queries:
- select id_utilizador,nbeneficiario,nome from adm_utilizadores a WHERE exists ( select 1 from adm_util_grupos b where
a.id_utilizador = b.id_utilizador and b.id_grupo = '1') ;
- SELECT b.*,rownum as row_num FROM ADM_UTILIZADORES b ORDER BY $sidx $sord
WHERE row_num BETWEEN $start AND $end";
Virtually want id_utilizador, nome, and nbeneficiario, I can get the first query, ordered me returning the first 10.
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Oct 2, 2011
I am new to sql..
I need to join 2 tables based on first match.. I cldnot use distinct on the result, as distinct work with entire row..
I cant use group by as well, since for group by hv to select all the columns which we need to display
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Jul 29, 2013
I have 2 tables SEC_MASTER_HISTA and SEC_MASTER_HISTB.
Now, I need to compare the data of the two tables column-wise.
Ideally the 2 tables should have the same security_alias values but in my case they do not as the two tables belong to 2 diff client models. There is however a main SECURITY_MASTERA and SECURITY_MASTERB tables which have the security_alias recorded and a primary_asset_id column value which can act as a link between SEC_MASTER_HISTA and SEC_MASTER_HISTB. But, I have not been able to figure out the exact query which will be ideal.
Attached are the table structures and the data it contains.
Note: I need to compare the Coupon and Freq column values of SEC_MASTER_HISTA and SEC_MASTER_HISTB.
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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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Mar 16, 2011
im trying to update a column in the employee table with the value "YES". Im getting an error message saying im missing a SET statement from this code below:
update e
SET e.review='YES'
from employee
inner join rentals r
on e.employee_id=r.employee_id
inner join job j
on e.job_id=j.job_id
where r.plate ='FY06WNT'
and j.function !='MANAGER'
and j.function !='PRESIDENT';
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