I am observing some skewed results for Left outer join where the main table has NULL in the field we are joining against with another table.
Just wondering if there are some tricks to get over it. I am currently using NVL(tab1.col1,'X') = NVL(tab2.col3,'X') and am just wondering if there is a better way to handle this.
I am trying to understand "ordered" hint. I want to use it in my sql where I am using some left outer joins. I believe if I use this ordered hint it will be much faster.
But the problem is I am not able to understand the concept of this hint. As i did alot of search on this eveyone says it will be , even I got some similar references where it worked But I am getting contradicting explanation for on this.
I am using left outer join to fetch PRSN_KEY .I need to find null values in B.PRSN_KEY. I am using below query but its giving me 0 count.
select count(*) from (
Select A.PRSN_KEY AS AKEY,B.PRSN_KEY AS BKEY from CD03955P.H_CM_EEST_EEOR A LEFT JOIN CD03955P.H_CM_EEST_EEOR B
ON
A.PRSN_KEY =B.PRSN_KEY
where
A.CAT_ID=111
AND
A.DATA_SOURCE='PEN_CO'
AND
B.CAT_ID = 1 and B.DATA_SOURCE ='PEN_EEST'
AND B.CAT_CD IN ('ACTIVE','LOA','LOAWP','LOAMLP','LOAMLN')
AND B.EFBEGDT < A.EFBEGDT
)
where BKEY IS NULL
I have the following query:
select col_1,col_9 from
book_temp b
where b.col_1 is not null
order by to_number(b.col_16)
;
What I want to add is the following:
COL_9
=====
NULL
A
B
NULL
C
D
E
F
NULL
G
I need to connect the NON-NULL rows to the preceding NULL row.
I am running a GROUP BY query on a few columns of enumerated data like:
select count(*), Condition, Size
group by Condition, Size;
COUNT(*) CONDITION SIZE
-------- ---------- --------
3 MINT L
2 FAIR L
4 FAIR M
1 MINT S
Well, let's say I also have a timestamp field in the database. I cannot run a group by with that involved because the time is recorded to the milisec and is unique for every record. Instead, I want to include this in my group by function based on whether or not it is NULL.
For example:
COUNT(*) CONDITION SIZE SOLDDATE
-------- ---------- -------- ----------
3 MINT L ISNULL
2 FAIR L NOTNULL
2 FAIR M NOTNULL
2 FAIR M ISNULL
1 MINT S ISNULL
I have a table which has a not null column. the column is date field. I am trying to change it to Null. But it is giving a error.
I am using below query.
ALTER TABLE T_test
modify (paid_to_date null)
create table test
(
id int ,
dat date
)
/
I want to implement a business rule such as we have for each id at most 1 dat null. So, I've created this unique index on test.
create unique index x_only_one_dat_cess_null on test(id, case when dat_cess is null then 'NULL' else to_char(dat_cess, 'dd/mm/yyyy') end);
insert into test values (1, sysdate);
insert into test values (1, sysdate - 1);
insert into test values (1, null);
insert into test values (1, null);
-- -----
insert into test values (2, sysdate);
insert into test values (2, sysdate - 1);
insert into test values (2, null);
The 4th insert will cause an error and this is what I wanted to implement. OK. Now the problem is that for non-null values of dat, we can't have data like this
iddat
------------
124/10/2013
123/10/2013
123/10/2013
1
because of the unique index (the 2nd and the 3rd row are equal). So just for learning purposes, how could we allow at most one null value of dat and allow duplicates for non-null values of dat.
when i follow this steps mention on this website
[URL].........
to modify column from null to not null i got this error and on this website its show successful
my steps are
first i create a table
SQL> create table Stu_Table(Stu_Id varchar(2), Stu_Name varchar(10),
2 Stu_Class varchar(10));
Table created.
Then insert some rows into Stu_Table
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(1,'Komal');
1 row created.
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(2,'Ajay');
1 row created.
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(3,'Rakesh');
1 row created.
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(4,'Bhanu');
1 row created.
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(5,'Santosh');
1 row created.
SQL> select * from Stu_Table;
ST STU_NAME STU_CLASS
-- ---------- ----------
1 Komal
2 Ajay
3 Rakesh
4 Bhanu
5 Santosh
Table Structure is like this
SQL> Describe Stu_Table
Name Null? Type
----------------------------------------- -------- ----------------------------
STU_ID VARCHAR2(2)
STU_NAME VARCHAR2(10)
STU_CLASS VARCHAR2(10)
now when i try to modify this Stu_id column to not null its give me error.
SQL>ALTER TABLE Stu_Table MODIFY Stu_Id int(3)not null;
ALTER TABLE Stu_Table MODIFY Stu_Id int(3)not null
*
ERROR at line 1:
ORA-01735: invalid ALTER TABLE option
and when i try to add new column with not null its also gives me error
SQL> ALTER TABLE Stu_Table add C1_TEMP integer NOT NULL;
ALTER TABLE Stu_Table add C1_TEMP integer NOT NULL
*
ERROR at line 1:
ORA-01758: table must be empty to add mandatory (NOT NULL) column
I have a table1:
userid, name, town.
Now i want to do a self join like:
select a.name, b.name, a.town
from table1 a
inner join table1 b
on a.town = b.town
where a.first_name <> b.first_name AND
a.last_name <> b.last_name
i added the where clause to limit duplicates i would get but i still get duplicates eg. A B london, B A london etc.
In mys store procedure I am using a subquery with INNER JOIN. This subquery calls a user defined function which takes main query fields as parameter values. But i am facing issue for accessing main query fields. my query is like below:
SELECT
ID, Name, sub.Desc, sub.Date
FROM MainTable main
INNER JOIN
(
SELECT * FROM RMF_GetData(main.ID)
) sub
ON main.ContactID = sub.ContactID
I need data from a function in a table format based on some case conditions. Hence i need to join it with main table. But here oracle gives error as "invalid identifier" for main.ID parameter.
SELECT so.* FROM shipping_order so WHERE (so.submitter = 20)
OR (so.requestor_id IN (SELECT poc.objid FROM point_of_contact poc WHERE poc.ain = 20))
OR so.objid IN (SELECT ats.shipping_order_id FROM ac_to_so ats WHERE (ats.access_control_id IN (selectac. objid FROM access_control ac WHERE ac.ain = 20
OR ac.group IN ('buyers', 'managers'))))
rewrite this query to use joins. That would greatly simplify my sql query building code. The ids, objids, submitter, ain are numeric and group is a varchar.
I pulled in 1121 SSN's into a table and am using that table as the basis for returning data from other tables...including how many documents a user has in their folder.
My query; however, is only returning 655 rows...it is returning only those rows that have documents in their folders. I want to return ALL rows...WHETHER OR NOT THEY HAVE A DOCUMENT COUNT (count(*)). How can I get all 1,121 rows to return? I would like the output to look like:
SSN LOCATION EMP_STATUS FOL_STATUS COUNT(*)
-- For those folders containing documents:
XXX-XX-XXXX WHATEVER WHATEVER WHATEVER 12
-- For those folders containing 0 documents:
XXX-XX-XXXX WHATEVER WHATEVER WHATEVER NULL
Here is the query in it's current state:
-- Get User/Folder/Doc Count Information
SELECT b.ssn,
b.location,
b.emp_status,
c.fol_status,
COUNT (*)
[Code]....
So again, my problem here is that...not all FOLDERS contain DOCUMENTS...but I still want the folder data lised...I just need it listed with either a zero count (0), or a NULL in the COUNT(*) column.
I'm trying the various joins, but none of them seem to be working.
I've tried the old 8i (+) join as follows:
AND c.fol_id = d.doc_fol_id(+)
I've tried the inner join:
AND c.fol_id(+) = d.doc_fol_id
...and I've tried the 9i method (left outer and full outer) using the following types of notations:
folder c full outer join documend d on c.fol_id = d.doc_fol_id
...so far, no luck. I'm still having only 655 rows returned (the 655 are those folders that HAVE document count > 0. Any folder that has zero documents in the document table just aren't being returned in the query.)
I have 8 columns. Some of them might be null.I want to display all 8 columns in my result. Not null columns will be first and null at the end.Here is a sample data :
Employee table :
Employee_id Emp_fname emp_lname emp_mname dept salary emp_height emp_weight
1 aaa ddd d1 100 6 180
2 bbb ccc 120 169
3 dfe d2 5.9 223
The expected result is :
result1 result2 result3 result4 result5 result6 result7 result8
1 aaa ddd d1 100 6 180
2 bbb ccc 120 169
3 dfe d2 5.9 223
why how ever way i try i cant get the joins on the tables properly.... well i know i have to work hard....if join is not proper the data i extract is also not proper.Well now i have 3 tables...
ps_operations
Name Null? Type
----------------------------------------- -------- --------
ASSB_PT_NBR_SEQ_ID NOT NULL NUMBER(8)
OPERATION_NBR NOT NULL VARCHAR2(10)
EFFECTIVE_FROM_DT NOT NULL DATE
DML_TS NOT NULL DATE
DML_USER_ID NOT NULL VARCHAR2(30)
OPERATION_DESC NOT NULL VARCHAR2(70)
HOURS_PER_PIECE_QTY NOT NULL NUMBER(9,6)
PIECES_PER_HOUR_RATE_QTY NOT NULL NUMBER(15,7)
EFFECTIVE_TO_DT DATE
EXTRACT_IND VARCHAR2(1)
[code]...
I have never worked on CPK and UK....so i dont know how to use them to join the tables,.
We have access to a remote Oracle database in Germany and need to insert selected data to our local Oracle database. Our problem is that we have to do several joins (7 tables) on the remote database as well as using one where clause (always the same: P.T_LIEF_LFNT_1='12803193').
Unfortunately we do not have rights to create a view on the remote database. Is there another way to send the entire query to the remote database for processing? Also, the query returns approximately 34,000 rows.
Here is our current query:
INSERT INTO PRIMUS(PARTNO,
SORT_FORMAT,
TP_WORKSPACE,
[Code].....
I have a query I am trying to tune. It presently takes anywhere from 15 minutes to two hours to run, depending on how many records the client has. But it needs to run several hundred times, and finish over the course of a weekend. When it runs over, we have problems.
Here's the basic structure of the query:
CODESELECT ...
FROM main_tab,
tab_a,
tab_b,
tab_c,
...
tab_z
WHERE main_tab.client_id = :1
AND main_tab.unique_id = tab_a.unique_id(+)
AND main_tab.unique_id = tab_b.unique_id(+)
AND main_tab.unique_id = tab_c.unique_id(+)
...
AND main_tab.unique_id = tab_z.unique_id(+);
All of the tables are indexed (and statistics are gathered) on the field unique_idMain_tab has an index on client_id.There is a one-to-one join (sometimes one-to-zero, thus the outer join) from the main_tab table to all the other tables.These are static tables, they're wiped and recreated - no changes, inserts, deletes.
By default, the optimizer does a full table scan and then a hash join on every single of the 26 tab_a through tab_z tables, only using the index on main_tab.
By the way I can add indexes, possibly even to the point of adding an index on some tables that would include all the fields found in the select clause on that table. But I cannot change the table structure (by, say, combining these tables together).
I am trying to control which tables are joined based on a null value, so I figured I could use the NVL2.
Here is the code as it stands
NVL2(TBL_TRANSACTIONS.EQUIPSVCSEQ, TBL_EQUIPANDSERVICES.LASTWORKORDERSEQ, TBL_TRANSACTIONS.WORKORDERSEQ)
= TBL_WORKORDERS.WORKORDERSEQ (+)
To explain, if first value is null, then TBL_EQUIPANDSERVICES.LastWOSeq = tbl_workorders.workorderseq (+), otherwise join the transaction.workorderseq.
When I try and execute this code, I'm given "ORA-01417: a table may be outer joined to at most one other table." I've double checked, TBL_Workorders is not joined with any other table in any select.
Now, the EquipandServices.workorderseq is joined (+) with another table.
can i able to partition the table based on the column which is in another table ??
For example Table X need to be partitioned based on the column in The Table Y . and Table X and table Y has some relation.
i want to get SUM(salary) by combining both employee and employees table.Look my table structure below:
SQL> select * from employee;
EMPNO ENAME HIREDATE ORIG_SALARY SALARY R MGR DEPTNO
---------- --------------- --------- ----------- ---------- - ---------- ----------
1 Jason 25-JUL-96 1234 8767 E 2 10
2 John 15-JUL-97 2341 3456 W 3 20
3 Joe 25-JAN-86 4321 5654 E 3 10
4 Tom 13-SEP-06 2413 6787 W 4 20
5 Jane 17-APR-05 7654 4345 E 4 10
6 James 18-JUL-04 5679 6546 W 5 20
7 Jodd 20-JUL-03 5438 7658 E 6 10
8 Joke 01-JAN-02 8765 4543 W 20
9 Jack 29-AUG-01 7896 1232 E 10
[code]....
Above, i used separate queries to get the result of SUM(salary) by deptno.Here, I want a single query to get SUM(salary) with deptno.
deptno Sum(salary)
----------------------------
10 30056
20 27132
30 6300
40 4300
I'm putting together a path to select a revision of a particular novel:
SELECT e.documentname, e.Revision, e.VersionNumber
FROM Catalog, BookInCatalog
INNER JOIN NovelMaster
INNER JOIN HasNovelRevision
INNER JOIN NovelRevision e
LEFT JOIN NovelRevision s
[code]...
My goal here is to select the earliest revision from the set of Novel revision. The revision field is a string.
When I run the query for Novels that have multiple revisions I get multiple records. If there is just one record I only get one row. If there are two I get four (two for each revision). As the number of revision increases it looks like it just mushrooms from there.
One other challenge is the format of the revision- a revision sequence could look like this:
A
B
C1
C2
C
D
E1
E
So there are "intermediate" revision referred to by a number. In this case I would select revision A, but if I had:
A1
A
B1
B
I would want to select B. I am pretty sure that all the revision are stored in the db in order.Notice that the comparison operator ">" is used in e.Revision > s.Revision. I initially though it should have been "<" because we want to select the initial but the other way gives me the right order (though the wrong results).
When to use inline query and to use join.
View 3 Replies View RelatedI am working on a new project in OBIEE. I am asked to do the data modeling in the database using oracle sql developer. I have to create the joins based on the requirements. I have the tables created already. But the primary keys for few tables are not defined for few tables. PK-FK joins are also not done properly.
My questions are
(1) If I have to define the primary key for the existing tables can I do that using the alter table command or should I create the table all over again and then define it?
(2) If I have to make the changes in the existing PK-FK joins how do i go about doing that?
If a query can be written using where clause, what is the purpose of using joins over where clause?
View 11 Replies View RelatedI want to display first joined and last joined employee name(first_name) in each department like this
department_name | first joined employee | last joined employee
I think we have to use joins and sub query.
employee table attributes -
EMPLOYEE_ID
FIRST_NAME
LAST_NAME
EMAIL
PHONE_NUMBER
HIRE_DATE
JOB_ID
[Code]....
I have many different file names within my table and I want to remove the .TXT extension from each one. I want to try this SQL but being a newbie in Oracle, I don't know how to say "Left" characters. "Left" is an invalid identifier.
Update TableName
Set File_Name = Left(File_Name, Len(File_Name)-4)
Where File_Name LIKE '%.TXT'
I am creating a query where I am trying to take phone call lengths and put them into buckets of length ranges 0:00 - 0:59, 1:00 - 1:59 etc. Even if there are no calls in the call table I need to return the range with a zero (hence the left join and nvl). When I do this the left join acts like an equal join, I suspect there is some reason left joins only work if there is an equal condition in the join (instead of >= and < that I use, or similarly I could use BETWEEN). I also have a question about performance (below).
The create table script for the lookup is like this:
CREATE TABLE DURATION_RANGES
(
RANGE_TEXT varchar2(20),
RANGE_LBOUND decimal(22),
RANGE_UBOUND decimal(22)
)
Sample inserts are:
INSERT INTO DURATION_RANGES (RANGE_TEXT,RANGE_LBOUND,RANGE_UBOUND) VALUES ('00:00 - 00:59',0,59);
INSERT INTO DURATION_RANGES (RANGE_TEXT,RANGE_LBOUND,RANGE_UBOUND) VALUES ('01:00 - 01:59',60,119);
etc.
The query is:
select
r.range_text as duration_range,
nvl(count(*),0) as calls,
nvl(SUM(call_duration),0) as total_duration
from
[code]...
As I say, it is not returning all ranges in the duration_ranges table, so acting like an inner join. I realize one solution would be to populate duration ranges with every value possible (instead of ranges) so join is an equal join, but that would make the duration_range table larger.
My questions:
1. Is it possible to get the left join to work with the duration range values as they currently are?
2. Even if 1 is possible, would it be better performance to have exact values (but a larger lookup table) and do an equals join instead of >=, < or BETWEEN? Performance now is not bad.
What I mean is (with only one time value and not lbound and ubound:
INSERT INTO DURATION_RANGES (RANGE_TEXT,RANGE_LBOUND,RANGE_UBOUND) VALUES ('00:00 - 00:59',0);
INSERT INTO DURATION_RANGES (RANGE_TEXT,RANGE_LBOUND,RANGE_UBOUND) VALUES ('00:00 - 00:59',1);
INSERT INTO DURATION_RANGES (RANGE_TEXT,RANGE_LBOUND,RANGE_UBOUND) VALUES ('00:00 - 00:59',2);
Using Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
Here's a simplified version of the query I am having problems with:
SELECT
assoc.association_id
FROM mentor_initiative mi
LEFT JOIN program assoc_prog ON assoc_prog.program_id = -1
LEFT JOIN mentor_association assoc ON assoc.mentor_initiative_id = mi.mentor_initiative_id AND
NVL(assoc_prog.program_id, -1) = NVL(assoc.program_id, -1)
Note that there is no program with program id -1. So the assoc_prog left join will come up with nothing. I was thinking that since assoc_prog.program_id will be null, the second assoc left join would pick the row where assoc.program_id is null. However, the second left join doesn't join to any row.
In this query, it does join to an assoc row (I changed assoc_prog.program_id to NULL)
SELECT
assoc.association_id
FROM mentor_initiative mi
LEFT JOIN program assoc_prog ON assoc_prog.program_id = -1
LEFT JOIN mentor_association assoc ON assoc.mentor_initiative_id = mi.mentor_initiative_id AND NVL(NULL, -1) = NVL(assoc.program_id, -1)
I was thinking it would join to an assoc row in the first query though. How can I change the first query to have the desired effect of left joining to a row where assoc.program_id is null if assoc_prog.program_id is null?
the below merge statements has outer join.
merge into merge_st t
using (select * from merge_st1) src
on (t.id=src.id(+))
when matched then update set name=src.name;
I need to convert oracle joins to ANSI joins. I have tried below
update (select t1.name as t1_name,t2.name as t2_name
from merge_st t1 lef outer join merge_st t2
on(t1.id=t2.id))
set t1_name=t2_name;
It statements shows error like cannot modify the non key preserved tables.I have cheked these table has contains whether primary key or not.there is no constraints for these tables.Our application, constaints handle in front end. so we cannot create any constraints in oracel database.how to convert oracle joins to ansi join?
I have the scenario like below:
create table test_a (id number, b varchar2 (20));
create table test_b (id number, a number, b number, c number, d number, e number, f number);
insert into test_a values (1,'Manu');
insert into test_a values (2,'Tanu');
insert into test_a values (3,'Anu');
[code].....
convert the query above using joins instead of scalar queries, as scalar queries decreasing the performance.
We have two tables, TableA and TableB that contain list of accounts and balances.The requirement is to compare the balances of accounts in both the tables, and if there is a difference, then record that difference with account number in another table.
Both TableA and TableB contain more than 10 million rows.What is the best way to do this task in PL/SQL? A join on TableA and TableB to know the differences has become very slow due to large volume.