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Difference between Math.Floor() and Math.Truncate()
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12 Answers
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Counting inversions in an array
I'm designing an algorithm to do the following: Given array A[1... n] , for every i < j , find all inversion pairs such that A[i] > A[j] . I'm using merge sort and copying array A to array B and then comparing the two arrays, but I'm having a difficult time seeing how I can use this to find...
MySQL selecting yesterday's date
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168
The simplest and best way to get yesterday's date is:
subdate(current_date, 1)
Your query w...
What's the difference between RANK() and DENSE_RANK() functions in oracle?
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10 Answers
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SQL: How to properly check if a record exists
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It's better to use either of the following:
-- Method 1.
SELECT 1
FROM table_name
WHERE unique_key = value;
-- Method 2.
SELECT COUNT(1)
FROM table_name
WHERE unique_key = value;
The first alternative should give you no result or one result, the second count should be zero or...
How to remove leading and trailing whitespace in a MySQL field?
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11 Answers
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Highlight the difference between two strings in PHP
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13 Answers
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How to convert 1 to true or 0 to false upon model fetch
...th true or false into a boolean/tinyint field in the database, which uses 1 or 0 .
4 Answers
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