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What is ?= in Makefile
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130
?= indicates to set the KDIR variable only if it's not set/doesn't have a value.
For example:
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Is it a good idea to index datetime field in mysql?
...ies. If your only condition is BETWEEN NOW() AND DATE_ADD(NOW(), INTERVAL 30 DAY) and you have no other index in the condition, MySQL will have to do a full table scan on every query. I'm not sure how many rows are generated in 30 days, but as long as it's less than about 1/3 of the total rows it ...
Measuring text width to be drawn on Canvas ( Android )
... Marc BernsteinMarc Bernstein
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How to redirect the output of an application in background to /dev/null
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231
You use:
yourcommand > /dev/null 2>&1
If it should run in the Background add an ...
When would you use .git/info/exclude instead of .gitignore to exclude files?
...ore in your comment above. My understanding is that ignore rules can be at 3 levels - $PROJECT/.git/info/exclude for (project, user) specific ignore rules, $PROJECT/<any number of directories>/.gitignore which is for project specific ignore rules across any user anywhere (when checked in), ~/...
How to make Scroll From Source feature always enabled?
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answered Jun 15 '12 at 13:43
chalimartineschalimartines
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Alter table add multiple columns ms sql
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edited Jun 21 '11 at 13:45
James
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answered Ma...
What is the difference between origin and upstream on GitHub?
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This should be understood in the context of GitHub forks (where you fork a GitHub repo on GitHu...
Setting focus on an HTML input box on page load
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This line:
<input type="password" name="PasswordInput"/>
should have an id attribute, ...