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Can I have multiple primary keys in a single table?
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Sarfaraaz
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answered Oct 20 '08 at 10:00
Adam PierceAdam Pierce
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How do I force Postgres to use a particular index?
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104
Assuming you're asking about the common "index hinting" feature found in many databases, Postgre...
How do I check that a number is float or integer?
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44 Answers
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Active
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How to pass an array within a query string?
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448
Here's what I figured out:
Submitting multi-value form fields, i.e. submitting arrays through...
How can I unstage my files again after making a local commit?
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479
git reset --soft HEAD~1 should do what you want. After this, you'll have the first changes in ...
What is the difference between `git merge` and `git merge --no-ff`?
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Lily BallardLily Ballard
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How do I redirect to another webpage?
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15045
One does not simply redirect using jQuery
jQuery is not necessary, and window.location.replace...
What's the deal with a leading underscore in PHP class methods?
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It's from the bad old days of Object Oriented PHP (PHP 4). That implementation of OO was pretty bad, and didn't include things like private methods. To compensate, PHP developers prefaced methods that were intended to be private with an underscore. In some older classes you'll...
find vs find_by vs where
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104
Use whichever one you feel suits your needs best.
The find method is usually used to retrieve a...
Select row with most recent date per user
... TIME | IO |
--------------------------------
| 2 | 9 | 1370931664 | out |
| 3 | 6 | 1370932128 | out |
| 5 | 12 | 1370933037 | in |
Solution which gonna work everytime:
SQLFIDDLEExample
SELECT t1.*
FROM lms_attendance t1
WHERE t1.id = (SELECT t2.id
FROM lms_at...