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How does MongoDB sort records when no sort order is specified?
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StennieStennie
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4
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SQL “select where not in subquery” returns no results
...east one of the values is NULL.
Suppose we have these data:
common
--
1
3
table1
--
NULL
1
2
LEFT JOIN / IS NULL and NOT EXISTS will return 3, NOT IN will return nothing (since it will always evaluate to either FALSE or NULL).
In MySQL, in case on non-nullable column, LEFT JOIN / IS NULL and...
How can I extract a good quality JPEG image from a video file with ffmpeg?
...ale:v (or the alias -q:v) as an output option.
Normal range for JPEG is 2-31 with 31 being the worst quality.
The scale is linear with double the qscale being roughly half the bitrate.
Recommend trying values of 2-5.
You can use a value of 1 but you must add the -qmin 1 output option (because the d...
How to align an image dead center with bootstrap
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273
Twitter Bootstrap v3.0.3 has a class: center-block
Center content blocks
Set an element to disp...
Does Firefox support position: relative on table elements?
...ut.
– Wesley Murch
Dec 14 '11 at 21:30
+1 This is the answer for me as well. display: block isn't enough of a fix on c...
Creating an iframe with given HTML dynamically
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123
Setting the src of a newly created iframe in javascript does not trigger the HTML parser until t...
Extract substring using regexp in plain bash
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edited Dec 26 '17 at 23:17
Yangshun Tay
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Switching to a TabBar tab view programmatically?
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Daniel Springer
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answered Mar 24 '11 at 1:12
JordanJordan
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Page redirect after certain time PHP
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231
header( "refresh:5;url=wherever.php" );
this is the php way to set header which will redirect...
How do you test that a Python function throws an exception?
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