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grouping

How to select the first row for each group in MySQL?

November 22, 2022 by Magenaut

In C# it would be like this:

Categories MySQL, Q&A Tags group-by, grouping, mysql Leave a comment

GROUP BY for continuous rows in SQL

November 19, 2022 by Magenaut

Given the following table:

Categories MySQL, Q&A Tags gaps-and-islands, grouping, mysql Leave a comment

Group multiples rows of result set data by a column value

October 25, 2022 by Magenaut

I want to send the overdue tasks that are assigned to a specific employee as an email summary. It is possible that multiple todos are assigned to the same employee. So multiple todos can be assigned to the same employee AND are overdue. That’s where the problem starts… So what I did, is grabbing all … Read more

Categories PHP, Q&A Tags grouping, join, pdo, php Leave a comment

How to group subarrays by a column value?

October 21, 2022 by Magenaut

I have the following array

Categories PHP, Q&A Tags arrays, grouping, php Leave a comment

How to group a multidimensional array by a particular subarray value?

October 19, 2022 by Magenaut

I have a multidimensional array and am trying to group them according to the value in a specific column.

Categories PHP, Q&A Tags arrays, grouping, multidimensional-array, php Leave a comment

Group array data on one column and sum data from another column

October 19, 2022 by Magenaut

I have my array data as shown below:

Categories PHP, Q&A Tags arrays, grouping, multidimensional-array, php, sum Leave a comment

Group array values based on key in php?

October 16, 2022 by Magenaut

I have a array like this: $str= Array ( [No] => 101 [Paper_id] => WE3P-1 [Title] => "a1" [Author] => ABC [Aff_list] => "University of South Florida, Tampa, United States" [Abstracts] => "SLA" ) Array ( [No] => 101 [Paper_id] => WE3P-1 [Title] => "a2" [Author] => DEF [Aff_list] => "University of South Florida, Tampa, … Read more

Categories PHP, Q&A Tags arrays, grouping, merge, php Leave a comment

Grouping arrays in PHP

October 16, 2022 by Magenaut

I have an array of 200 items. I would like to output the array but group the items with a common value. Similar to SQL’s GROUP BY method. This should be relatively easy to do but I also need a count for the group items.

Categories PHP, Q&A Tags algorithm, arrays, data-structures, grouping, php Leave a comment

How to count the consecutive duplicate values in an array?

October 14, 2022 by Magenaut

I have an array like this:

Categories PHP, Q&A Tags arrays, counting, duplicates, grouping, php Leave a comment

Group subarrays by one column, make comma-separated values from other column within groups

October 14, 2022 by Magenaut

I have a array that looks like this:

Categories PHP, Q&A Tags csv, grouping, multidimensional-array, php, string-concatenation Leave a comment
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