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Not equal != operator on NULL
... +1 ... not soon enough. Now when can I get "duplicate" NULLs in an index? :(
– user166390
Apr 14 '11 at 5:19
Y...
Complex CSS selector for parent of active child [duplicate]
...Script code:
document.getElementsByClassName("active")[0].parentNode;
// jQuery code:
$('.active').parent().get(0); // This would be the <a>'s parent <li>.
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...
Stretch and scale a CSS image in the background - with CSS only
... height: 100%;
position: fixed;
left: 0px;
top: 0px;
z-index: -1; /* Ensure div tag stays behind content; -999 might work, too. */
}
.stretch {
width:100%;
height:100%;
}
That produces the desired effect: only the content will scroll, not the background.
The backgroun...
How do I find a “gap” in running counter with SQL?
I'd like to find the first "gap" in a counter column in an SQL table. For example, if there are values 1,2,4 and 5 I'd like to find out 3.
...
MySQL select 10 random rows from 600K rows fast
...s 0.35s on my machine.
This is fast because the sort phase only uses the indexed ID column. You can see this behaviour in the explain:
SELECT * FROM tbl ORDER BY RAND() LIMIT 10:
SELECT * FROM tbl AS t1 JOIN (SELECT id FROM tbl ORDER BY RAND() LIMIT 10) as t2 ON t1.id=t2.id
Weighted Version: ...
Rebase array keys after unsetting elements
...e but you can't use it inside a for/foreach loop because it rearranges the index every time you call it, so the index of the foreach loop doesn't point to the next element but to the element with that position on the rearranged array. You can see in you example you are deleting the value '3' and lea...
Remove sensitive files and their commits from Git history
...double quotes (") instead of singles in this command
git filter-branch --index-filter \
'git update-index --remove PATH-TO-YOUR-FILE-WITH-SENSITIVE-DATA' <introduction-revision-sha1>..HEAD
git push --force --verbose --dry-run
git push --force
Update 2019:
This is the current code from the...
Flask raises TemplateNotFound error even though template file exists
...ems like my local flask (on Windows) can find templates inside ./Templates/index.html, but when I deploy to heroku (thought it was same Python, same library versions, including same Flask version; but heroku is Unix); and throws TemplateNotFound error; after I renamed the folder git mv Templates/ind...
How do I reverse an int array in Java?
...ta[right];
data[right] = temp;
// move the left and right index pointers in toward the center
left++;
right--;
}
}
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MySQL: Fastest way to count number of rows
...
When you COUNT(*) it takes in count column indexes, so it will be the best result. Mysql with MyISAM engine actually stores row count, it doensn't count all rows each time you try to count all rows. (based on primary key's column)
Using PHP to count rows is not very ...