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Hi all,
I've got a web application that matches images to tags, and I need to create a way of dynamically refine results for tag search. However, I cannot find a clean way to make that SQL queries, and that's where I need your help.
The idea is that if...
Started by Alpha on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
I would not use an N-N relation but a text field.
Them with a value that won't occur in tags.
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How does:
1 + 2 + ... + N-1 + N + N + N-1 + ... + 2 + 1 N+1 + N+1 + ... + N+1 + N+1
equal N(N + 1)? Shouldn't it be 4N + 4 or 4(N + 1)?
Started by Brandon on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
I assume your notation means row 1 + row 2 ... .
Because you have N number of (N+1) terms.
It is N(N + 1).
Otherwise you need to fill in the rest of the elided values that the ellipses represent.
If N is 4, sure.
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I need a simple UUID generator. The ID is required to be unique for this single instance. Another requirement is, that it has n hashes coexisting at a time, and being releasable. I don't know wether this fits the UUID concept or not. I allrdy thought ...
Started by soxs060389 on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
This version + other versions can be located at www.boostpro.com
Example :
#include <string> #include <... .
The link is to v13.
I highly recommend this library, it's a boost candidate - we're using it in one of our projects and it works just fine .
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I have a table with 50 columns and 1000s of rows. I want to output the top 5 records for each column. To get 1 record I do:
SELECT MAX(column1), MAX(column2), MAX(column3) FROM table
This gets the top value for each column but how can I get the second...
Started by Peter on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
So you could get the top....
Assuming the greatest five values in each column could occur on distinct rows, you have to do to the same row.
SELECT MAX(column1), MAX(column2), MAX(column3) FROM table LIMIT n
where n = number of times.
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Hi guys,
I found this on the internet. It looks good an interview question.
I guess I got the working correct but programatically I haven't tried it.
SmallestInt
You are given an integer n . Return the smallest integer greater than or equal to n that
...
Started by Amitd on
, 12 posts
by 11 people.
Answer Snippets (Read the full thread at stackoverflow):
(But i believe it should be possible to have a more "intelligent" solution... .
A reasonable solution is to start with max(n,{k-digits long prefix of 1023456789}), and test values with n and count up until the condition is fulfilled.
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When reading a stack trace like:
[FormatException: Input string was not in a correct format.] System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +2755599 System.Number.ParseInt...
Started by dariom on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
(Basically they're taking the place of line numbers, which of course aren't available without the pdbs.)
it is the byte offset into native... .
I believe they're offsets into the code of the method - whether IL or JIT-compiled-assembly bytes, I'm not sure.. .
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Given this data set:
ID Name City Birthyear 1 Egon Spengler New York 1957 2 Mac Taylor New York 1955 3 Sarah Connor Los Angeles 1959 4 Jean-Luc Picard La Barre 2305 5 Ellen Ripley Nostromo 2092 6 James T. Kirk Riverside 2233 7 Henry Jones Chicago 1899...
Started by BlaM on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
Grouping.
BY City to outer query, as people with same birth years would return multiple values.
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I have the following array which contains arrays of values:
$array = array( array('1', '2'), array('a', 'b', 'c'), array('x', 'y'), );
There can be any number of arrays and an array can contain any number of values. I currently have a piece of code which...
Started by Jack Sleight on
, 8 posts
by 8 people.
Answer Snippets (Read the full thread at stackoverflow):
Correct answer as array(0,1,2,...,n);
Then I recurse into a function for trying all values in the first with some symbol, say '0', so they all have equal number of values, in your example
$array = array array values and for....
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I'm trying to input a form of data validation in which when a user enter's a book's ISBN number, if it has already been stored then it will output an error message. However, I'm having trouble doing this. I'm not sure if I'm overloading the == operator...
Started by trikker on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
After setting your ISBN values (and any other fields you plan to use.
Conditionals are already of type bool.
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Std::next_permutation (and std::prev_permutation) permute all values in the range [first, last) given for a total of n! permutations (assuming that all elements are unique).
is it possible to write a function like this:
template<class Iter> bool...
Started by Greg Rogers on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
This will need O(N) additional memory, but enables you to permute the original sequence in place.
By permuting a sequence of R ones and (N-R) zeroes.
Generate all selections, e.g.
Non-selected items.
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