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MySQL, better to insert NULL or empty string?
...re differences:
A LENGTH of NULL is NULL, a LENGTH of an empty string is 0.
NULLs are sorted before the empty strings.
COUNT(message) will count empty strings but not NULLs
You can search for an empty string using a bound variable but not for a NULL. This query:
SELECT *
FROM mytable
WHERE ...
How do I look inside a Python object?
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360
Python has a strong set of introspection features.
Take a look at the following built-in funct...
Swift days between two NSDates
...onsider the time difference as well. For example if you compare the dates 2015-01-01 10:00 and 2015-01-02 09:00, days between those dates will return as 0 (zero) since the difference between those dates is less than 24 hours (it's 23 hours).
If your purpose is to get the exact day number between tw...
Convert PHP closing tag into comment
... you.
– v1n_vampire
Mar 5 '13 at 9:30
1
I had to use this trick in C 2 days ago for a string cont...
How to remove non-alphanumeric characters?
I need to remove all characters from a string which aren't in a-z A-Z 0-9 set or are not spaces.
9 Answers
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split string only on first instance of specified character
...
answered Jan 5 '11 at 18:30
MarkMark
30.8k1111 gold badges3838 silver badges4444 bronze badges
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PHP - Check if two arrays are equal
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530
$arraysAreEqual = ($a == $b); // TRUE if $a and $b have the same key/value pairs.
$arraysAreEqua...
Maven Run Project
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edited Jun 20 '18 at 16:17
Nadjib Mami
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How to pass arguments to a Button command in Tkinter?
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edited May 4 '15 at 0:43
nbro
10.9k1717 gold badges7676 silver badges140140 bronze badges
answered...
Undo git update-index --skip-worktree
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204
Aha! I simply want:
git update-index --no-skip-worktree <file>
...