We have a table with, say, 5 indices (one clustered). Question: will it somehow negatively affect optimizer performance - either speed or accuracy of index picks - if all 5 indices start with the same exact field? (all other things being equal). It was suggested by someone at the company that it may have detrimental effect on performa...
To be more specific (since the general answer to the subject is likely "yes"): We have a table with lots of data in Sybase. One of the columns is "date of insertion" (DATE, datetime type). The clustered index on the table starts with the "DATE". Question: For another, non-clustered index, does the order of columns (more specifically...
Is there a function/method to retrieve the index of an item in an array from its value in JavaScript? In other words I'm looking for the JavaScript equivalent for the Python .index() lists method: >>> ['stackoverflow','serverfault','meta','superuser'].index('meta') 2 Does the wheel already exist or have I to reinvent it? ...
For example: Given columns A,B,C,D, IX_A is an index on 'A' IX_AB is a covering index on 'AB' IX_A can be safely removed, for it is redundant: IX_AB will be used in its place. I want to know if this generalizes: If I have: IX_AB IX_ABC IX_ABCD and so forth, Can the lesser indices still be safely removed? That is, does IX_ABC ma...
hello, I have a table Cars with datetime (DATE) and bit (PUBLIC). Now i would like to take rows ordered by DATE and with PUBLIC = 1 so i use: select c.* from Cars c WHERE c.PUBLIC = 1 ORDER BY DATE DESC But unfortunately when I use explain to see what is going on I have this: 1 SIMPLE a ALL IDX_PUBLIC,DATE NULL ...
[Warning: long post ahead!] I've banging my head at this for quite some time now but can't get on a common denominator what is going on. I've found a solution to workaround, see at the end, but my inner Zen is not satisfied yet. I've a main table with forum messages (it's from Phorum), simplified looks like this (ignore the anon_user_i...
Hello: I feel that this question has a simple answer; but, for the life of me, I could not figure it out. I am trying to convert a listbox selection to its string element so I can enter it into a database. I understand that I can use .listbox curselection to get its index; however, I need to convert it into its string. Can anyone h...
Is there a function in c that will return the index of a char in a char array? For example something like: char values[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; char find = 'E'; int index = findInedexOf( values, find ); ...
Hello, I am after a string format to efficiently represent a set of indices. For example "1-3,6,8-10,16" would produce [1,2,3,6,8,9,10,16] Ideally I would also be able to represent infinite sequences. Is there an existing standard way of doing this? Or a good library? Or can you propose your own format? thanks! Edit: Wow! - thank...
I've seen apps that take the UITableView index header (i.e. the thing in the iPod application that separates songs starting in A, B, etc.) and put their own custom image as the background. Such apps are the myStarbucks app and the What's on TV? app. I've looked a little bit through the documentation and there doesn't seem to be a specifi...
This has really been bugging me. I would like to have the login interface on my home page for ASP.NET MVC. I have tried creating a partial view inside of the ~/Views/Account/ directory named LogOn.ascx but when i try to submit the values via the submit button, everything blows up. Am I missing something or is there an easier way to do th...
Hello, How would I index a price int field in a Zend Lucene Search Index? I am currently using: $doc->addField(Zend_Search_Lucene_Field::Keyword('price', $price, 'utf-8')); Is this the correct way? Or should I be storing it specifically as a number somehow? ...
I have a function in Haskell which finds the maximum value of an exponentiation from a list: prob99 = maximum $ map (\xs -> (head xs)^(head (tail xs))) numbers What I need to find is the location of this maximum value in the resultant list. How would I go about this? Edit: I found a solution that goes like this: n = [[519432,525806]...
I'm quite new to setting indexes myself. I'm currently just experimenting with it to discover how it works and in what cases a database will make use of the index. I've got a simple table with 3 columns; an id, a name and a status. I've set an index on the name which is a CHAR(30) column. Against my expectations, MySQL ignores this inde...
suppose I have a table that stores 100 million records of strings of varying sizes up to 20 characters in a column field. I need to index this column, I only have a 2GB-Ram machine, is this sufficient to perform such task? Is mysql recommended db engine for storage? ...
Hi experts... I'm currently having difficulty integrating my Search page, which is currently using Microsoft Index Server, with my generated .shtml files from the CMS. It seems that Microsoft Index Server is not able to search for .shtml files (HTML with Server Side Includes/SSI) properly. Any idea why and the solution to it? Any other ...
How can you get the index number in Java? Example which is not working class masi { public static void main( String[] args ) { char[] list = {'m', 'e', 'y'}; // should print 1 System.out.println( list[] == "e" ); ...
I have a number of "sets" of input fields on page, like this: <div id="allthesets"> <div> <input name="po-3" type="text"> <input name="ba-3" type="text"> </div> <div> <input name="po-9" type="text"> <input name="ba-9" type="text"> </div> <div> <input name="po-123" type="text"> <input...
Hello, I realize that the exact question has been asked before on stack overflow with only a vaguely conclusive answer: link So here it is again. Table A: Has an integer column which is nullable, along with an index. Query: SELECT * from table WHERE column IS null LIMIT 10; Will an index be used, or will mysql do a full table scan un...
Hi guys, I would like to know how to change the edit column position after setting AutoGenerateEditButton="true". By default it is displayed always on the left as the 1st column. TIA ...