Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>It's difficult to give you an exact answer since there are things you leave out from your explanation. For example, how should lines that are sorted by one of the columns but have differences in other columns be sorted internally? Should they be sorted by some other column, be left in the original order or could they be placed in an arbitrary order?</p> <p>Given the way I interpret your question, I would probably define my own class for comparisons.</p> <pre><code>&lt;?php class ColumnCompare { function __construct($column) { $this-&gt;column = $column; } function compare($a, $b) { if ($a[$this-&gt;column] == $b[$this-&gt;column]) { return 0; } return ($a[$this-&gt;column] &lt; $b[$this-&gt;column]) ? -1 : 1; } } // Hard-coded input $array_var = array(array(1,2,3,4), array(5,6,7,8), array(3,5,3,9)); $sort_by_col = 2; // Create object for sorting by a particular column $obj = new ColumnCompare($sort_by_col); usort($array_var, array($obj, 'compare')); // Write CSV to standard output $sout = fopen('php://stdout', 'w'); foreach ($array_var as $fields) { fputcsv($sout, $fields); } fclose($sout); ?&gt; </code></pre> <p>In the end you pose another question, which is impossible to answer. If you remove duplicates from a single column, what is then supposed to happen with the rest of the line? Should only one line be kept, and in that case which one? You could also by "remove duplicates" mean that you want to remove the values and put NULL in their positions. If you want that particular problem solved, you need to provide some details.</p> <p>If your CSV file is really simple, and all the values on any line with duplicates are identical (which was the case in your example before it was edited), you can easily run a command such as</p> <pre><code>sort myfile.csv | uniq </code></pre> <p>but I have a feeling that it's more complicated than that. <code>uniq</code> also has settings to return only the duplicate lines for example. It's also possible to write commands to retrieve a certain column from each line and operate on that. But like I said, it's not possible to construct such a command without more information.</p>
    singulars
    1. This table or related slice is empty.
    1. POMultidimensional array sorting procedure for csv files
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USAnders Sjöqvist
    1. USAnders Sjöqvist
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POMultidimensional array sorting procedure for csv files
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COThis answer was perfect. I ran the code against a few number sequences and the result is what was desirable. Without any examples I cant seem to understand your first question. But regardless the code works and it sorts a column out with its row entact just like excel's sort. Thanks!
      singulars
      1. PO
      1. This table or related slice is empty.
    2. COI just have one more question. Now the CSV files have headers in them. How do I skip the first row in the whole procedure?
      singulars
      1. PO
      1. This table or related slice is empty.
    3. CO@SofianeMerah, great that it worked! Regarding the CSV headers, we're speaking about the input file now, right? If you want to remove the first line from a file already on the command line, just run `sed 1d inputfile.csv > outputfile.csv`. If you've read the contents of a file into the array structure you described, you can just run `array_shift($array_var);` in PHP to remove the first element in the array (before sorting it). There are other ways to achieve the same result, however. If you have specific requirements about where to perform this operation, please let me know.
      singulars
      1. PO
      1. USAnders Sjöqvist
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload