String help needed.
Hi guys column(below in the SQL) is a Varchar string column. COLUMN has values like ('312049D','312CF45','EDC0645','EDC5679').
Why does SQL2 take more than twice times it takes to return SQL1 . I am learning ways to tune SQL. Please provide your suggestions/experiences to tune the SQL2. I don't understand how does it matter whether it is a 312 or EDC since the column itself is a varchar string column. Thanks in advance.
--SQL1
SELECT COLUMN FROM TABLE
WHERE SUBSTR(COLUMN,1,3) IN ('312')
vs
--SQL2
SELECT COLUMN FROM TABLE
WHERE SUBSTR(COLUMN,1,3) IN ('EDC')
jeneesh wrote:
Nimish Garg wrote:
I would suggets you to create an index on COLUMN, and re-write your query using LIKE and index hint. following may be helpful
http://nimishgarg.blogspot.in/2012/10/index-hints-and-like-clause.html
To use INDEX hint? Do you really mean it?
Do you think orcle is not intelligent enough to decide whether to use index or not?I would also link to the documentation:
http://docs.oracle.com/cd/E11882_01/server.112/e17118/sql_elements006.htm
>
Hints were introduced in Oracle7, when users had little recourse if the optimizer generated suboptimal plans. Now Oracle provides a number of tools, including the SQL Tuning Advisor, SQL plan management, and SQL Performance Analyzer, to help you address performance problems that are not solved by the optimizer. Oracle strongly recommends that you use those tools rather than hints. The tools are far superior to hints, because when used on an ongoing basis, they provide fresh solutions as your data and database environment change.
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Launch the Console application in any of the following ways:
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Go to Solution.
Attachments:
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Programming help needed here. Any advice would be greatly appreciated!!!
I have been assigned some work for a program called Processing 1.0 availale at http://processing.org/download
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I decompiled the files and got the source code, but it is a slight variation of the original someone made in processing, and needs some tidying to get it to run.
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CODE is BELOW
// Decompiled by DJ v3.10.10.93 Copyright 2007 Atanas Neshkov Date: 02/05/2009 13:15:00
// Home Page: http://members.fortunecity.com/neshkov/dj.html http://www.neshkov.com/dj.html - Check often for new version!
// Decompiler options: packimports(3)
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size(Side, Side);
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Edited by: chevy1 on May 2, 2009 7:32 AMHELP NEEDED PLEASEShouting is a good way ensure you don't get help. Also you should give a meaningful subject.
Any advice would be greatly appreciated!!!I suggest you ask a question after providing enough information to be able to answer it.
Also use CODE tags when posting code as it make the code more readable.
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Help needed:Printing HTML file using javax.print
Hi
I am using the following code which i got form the forum for rpinting an HTML file.
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Thanks
RamRam,
I have had printing problems too a year and a half ago. I used all printing apis of java and I still find that it is something java lacks. Now basically you can try autosense. To check whether your printer is capable of printing the docflavor use this PrintServiceLookup.lookupPrintServices(flavor, aset); . If it lists the printer then he can print the document otherwise he can't. I guess that is why you get the error.
Regards,
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Search help needs more records than 500 or 5000
I have a requirement to create search help on a non primary key field . So I need to work on search help exit to remove all the repeating and blank values . The problem I am facing rite now is that search help gets only 500 records by default and 5000 if we leave the restriction field blank . I need to get all the records which is approx more than 100000 and get only the unique values .
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EXIT.
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I'm a Student and new to java and I have been given a question which I have to go through. I have come across a problem with one of the questions and am stuck, so I was wondering if you guys could help me out.
here is my code so far:
A Class that maintains Information about a book
This might form part of a larger application such
as a library system, for example.
@author (your name)
*@version (a version number or a date)*
public class Book
// instance variables or fields
private String author;
private String title;
Set the author and title when the book object is constructed
public Book(String bookAuthor, String bookTitle)
author = bookAuthor;
title = bookTitle;
Return The name of the author.
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return author;
Return The name of the title.
public String getTitle()
return title;
and below are the questions that I need to complete. they just want me to add codes to my current one, but the problem is I don't know where to put them and how I should word them, if that makes sense.
Add a further instance variable/field pages to the Book class to store the number of pages in the book.
This should be of type int and should be set to 0 in the Constructor.
Add a second Constructor with signature
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this parameter is used - obviously?? - to initialise the number of pages.
Note: This is easiest done by making a copy of the existing Constructor and adding the parameter.
Add a getPages() accessor method that returns the number of pages in the book.
Add a method printDetails() to your Book class. This should print out the Author title and number of pages to the Terminal Window. It is your choice as to how the data is formatted, perhaps all on one line, perhaps on three, and with or without explanatory text. For instance you could print out in the format:
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Add a further instance variable/field refNumber() to your Book class. This stores the Library's reference number. It should be of type String and be initialised to the empty String "" in the constructor, as its initial value is not passed in as a parameter. Instead a public mutator method with the signature:
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Add a corresponding getRefNumber() accessor method to your class so you can check that the mutator works correctly
Modify your printDetails() method to include printing the reference number of the book.
However the method should print the reference number only if it has been set - that is the refNumber has a non-zero length.
If it has not been set, print "ZZZ" instead.
Hint Use a conditional statement whose test calls the length() method of the refNumber String and gives a result like:
Title: Jane Eyre, Author: Charlotte Bronte, Pages:226, RefNo: CB479 or, if the reference number is not set:
Title: Robinson Crusoe, Author: Daniel Defoe, Pages:347, RefNo: ZZZ
Modify your setRefNumber() method so that it sets the refNumber field only if the parameter is a string of at least three characters. If it is less than three, then print an error message (which must contain the word error) and leave the field unchanged
Add a further integer variable/field borrowed to the Book class, to keep a count of the number of times a book has been borrowed. It should (obviously??) be set to 0 in the constructor.
Add a mutator method borrow() to the class. This should increment (add 1 to) the value of borrowed each time it is called.
Include an accessor method getBorrowed() that returns the value of borrowed
Modify Print Details so that it includes the value of the borrowed field along with some explanatory text
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2. You need to ask a specific question. If you have no idea where to start, then start here: [http://home.earthlink.net/~patricia_shanahan/beginner.html]
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About Java 2 opaque font color question, help needed!
About Java 2 opaque font color question, help needed!
I was trying to test opaque font (the string has a foreground color and a background color), but i can't find the method for doing that.
i can change foreground by Graphics2D.setPaint(Color.black).
Anybody know how to change the background of the string?
Thanks!Hi. The way I'd do it would be to use the font metrics to find the length of a string and draw a rectangle and then drawstring over the rectangle. If you want an example, I can post it although I suspect theres a better way.
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JCmboBox setSelectedIndex help needed !!!!!!!!!!!!
hi,
I hope it's a trivial question but I am not able to solve it so need your help plz. I have a demo program if you run it you will see what I mean. Actually I am adding items to my JComboBox dynamically. My problem is that if I add the items with the same name and then explicitly set them selected my first item with same name is always highlighted and selected even though I say to select the last item which I add. But when I pull down the comboBox my first item with the same name is selected and highlighted not the last one. Please run the program and see. How can I solve this problem help needed.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ComboBoxDemo extends JPanel {
JButton picture;
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String[] petStrings = { "Bird", "Cat", "Dog", "Rabbit", "Pig" };
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final JComboBox petList = new JComboBox(petStrings);
picture = new JButton("ADD");
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public void actionPerformed(ActionEvent e) {
petList.addItem("TEST ");
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add(petList, BorderLayout.NORTH);
add(picture, BorderLayout.SOUTH);
setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
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frame.addWindowListener(new WindowAdapter() {
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I want to select the last item I add even if there exists an item with same name.
Any help is greatly appreciated.
Thanks.never mind I got the answer.
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Expression -puzzling(help needed)
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Is there a possibility that my expression fails on the first run trying to load into a column in the table having truncation error,but ultimately runs at the second time(having that column alone empty while populating other columns?).
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If I understand correctly, a derived column with expression fails in the first time when execution the package, but it works fine after change the source column to another column that has more length with empty. For example, use the expression (DT_WSTR,4)[column_name]
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If in this scenario, the issue you said is possible. Because nchar(10) is Fixed-length Unicode string data, nvarchar(50) is Variable-length Unicode string data. The expression (DT_WSTR,4)[column_name] can cause truncation error when the column with nchar(10)
data type.
If I have something misunderstood, please provide us more information about the issue. If possible, provide us some screenshots about the package design, error message, expression and column information. So that we can make further analysis and help you
out.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support -
help needed for writing query
i have the following tables(with data) as mentioned below
FK*-foregin key (SUBJECTS)
FK**-foregin key (COMBINATION)
1)SUBJECTS(table name)
SUB_ID(NUMBER) SUB_CODE(VARCHAR2) SUB_NAME (VARCHAR2)
2 02 Computer Science
3 03 Physics
4 04 Chemistry
5 05 Mathematics
7 07 Commerce
8 08 Computer Applications
9 09 Biology
2)COMBINATION
COMB_ID(NUMBER) COMB_NAME(VARCHAR2) SUB_ID1(NUMBER(FK*)) SUB_ID2(NUMBER(FK*)) SUB_ID3(NUMBER(FK*)) SUBJ_ID4(NUMBER(FK*))
383 S1 9 4 2 3
384 S2 4 2 5 3
---------I actually designed the ABOVE table also like this
3) a)COMBINATION
COMB_ID(NUMBER) COMB_NAME(VARCHAR2)
383 S1
384 S2
b)COMBINATION_DET
COMBDET_ID(NUMBER) COMB_ID(FK**) SUB_ID(FK*)
1 383 9
2 383 4
3 383 2
4 383 3
5 384 4
6 384 2
7 384 5
8 384 3
Business rule: a combination consists of a maximum of 4 subjects (must contain)
and the user is less relevant to a COMB_NAME(name of combinations) but user need
the subjects contained in combinations
i need the following output
COMB_ID COMB_NAME SUBJECT1 SUBJECT2 SUBJECT3 SUBJECT4
383 S1 Biology Chemistry Computer Science Physics
384 S2 Chemistry Computer Science Mathematics Physics
or even this is enough(what i actually needed)
COMB_ID subjects
383 Biology,Chemistry,Computer Science,Physics
384 Chemistry,Computer Science,Mathematics,Physics
you can use any of the COMBINATION table(either (2) or (3))
and i want to know
1)which design is good in this case
(i think SUB_ID1,SUB_ID2,SUB_ID3,SUB_ID4 is not a
good method to link with same table but if 4 subjects only(and must) comes
detail table is not neccessary )
now i am achieving the result by program-coding in C# after getting the rows from oracle
i am using oracle 9i (also ODP.NET)
i want to know how can i get the result in the stored procedure itsef.
2)how it could be designed in any other way.
any help/suggestion is welcome
thanks for your time --PradeeshWell I forgot the table-alias, here now with:
SELECT C.COMB_ID
, C.COMB_NAME
, (SELECT SUB_NAME
FROM SUBJECTS
WHERE SUB_ID = C.SUB_ID1) AS SUBJECT_NAME1
, (SELECT SUB_NAME
FROM SUBJECTS
WHERE SUB_ID = C.SUB_ID2) AS SUBJECT_NAME2
, (SELECT SUB_NAME
FROM SUBJECTS
WHERE SUB_ID = C.SUB_ID3) AS SUBJECT_NAME3
, (SELECT SUB_NAME
FROM SUBJECTS
WHERE SUB_ID = C.SUB_ID4) AS SUBJECT_NAME4
FROM COMBINATION C;
As you need exactly 4 subjects, the columns-solution is just fine I would say. -
Help needed I have a canon 40D. I am thinking of buying a canon 6D.But not sure that my len
Hi all help needed I have a canon 40D. I am thinking of buying a canon 6D.
But not sure that my lenses will work.
I have a 170mm/ 500mm APO Sigma.
A 10/20 ex Sigma HSM IF.
And a 180 APO Sigma Macro or do I have to scrap them and buy others.
ALL Help will be greatly received. Yours BRODIEIn short, I love it. I was going to buy the 5DMark III. After playing with it for a while at my local Fry's store where they put 5DMII, 5DMIII and 6D next to each other, using the same 24-105L lens, I decided to get the 6D and pocket the different for lens later.
I'm upgrading from the 30D. So I think you'll love it. It's a great camera. I have used 5DMII extensively before (borrowing from a close friend).
Funny thing is at first I don't really care about the GPS and Wifi much. I thought they're just marketing-gimmick. But once you have it, it is actually really fun and helpful. For example, I can place the 6D on a long "monopod", then use the app on the phone to control the camera to get some unique perspective on some scenes. It's fun and great. GPS is also nice for travel guy like me.
Weekend Travelers Blog | Eastern Sierra Fall Color Guide -
Help needed! Raid degraded again!
Hi!
Help needed! I hava made bootable RAID with two S-ATAII 250Gb HDD and its not working! Every now and then at bootup I get a message RAID -> DEGRADED... Must be seventh time! Rebuild takes its own time!
What am I doing wrong!
T: Ekku
K8N Neo4 Ultra
AMD 64 4200+
2 Gb RAM
2 x 250 Gb HDD (Maxtor)
nVidia RAID (in mb)
P.S. I wery SORRY with my poor language!I'm going to blame the nVRAID because I've seen issues with it in the past. If your motherboard has another non-nVidia RAID solution, use that instead. Using the nVidia SATA ports as BASE or JBOD is fine and dandy but RAIDing always had issues. It's not even a driver issue I think it's just instability. Latest drivers and even boxed drivers never helped. Granted, some will report success with their rig. But on a professional level I've seen nForce issues on different motherboards and different hard drives that had RAID disaster stories.
Good luck and if you don't have another RAID solution, my suggestion would be to buy a dedicated RAID controller card.
LPB
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