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Select rows which are not present in other table
...ip_location
WHERE ip = l.ip
);
Also consider:
What is easier to read in EXISTS subqueries?
LEFT JOIN / IS NULL
Sometimes this is fastest. Often shortest. Often results in the same query plan as NOT EXISTS.
SELECT l.ip
FROM login_log l
LEFT JOIN ip_location i USING (ip) -- short...
Base64 length calculation?
After reading the base64 wiki ...
15 Answers
15
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How to Display Selected Item in Bootstrap Button Dropdown Title
... Hi Behseini, this "$(function(){});" is equivilant to "$(document).ready(function() {});" you can find more information here:api.jquery.com/ready
– Jai
Nov 18 '12 at 12:11
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Eclipse Android and gitignore
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@checklist Did you not read the question? Or is it that did you not understand my point? He asked "What files/folders can I safely ignore for inclusion with git?", the answer to which IS ANY of them. How do you know he doesn't want to temporarily ...
Difference between “git add -A” and “git add .”
...gnored, it does not stage any 'rm' actions.
git add -u looks at all the already tracked files and stages the changes to those files if they are different or if they have been removed. It does not add any new files, it only stages changes to already tracked files.
git add -A is a handy shortcut for...
Putting git hooks into repository
...show-toplevel)/.git/hooks
for hook in $HOOK_NAMES; do
# If the hook already exists, is executable, and is not a symlink
if [ ! -h $HOOK_DIR/$hook -a -x $HOOK_DIR/$hook ]; then
mv $HOOK_DIR/$hook $HOOK_DIR/$hook.local
fi
# create the symlink, overwriting the file if it exists...
Installing PDO driver on MySQL Linux server
...
That's a good question, but I think you just misunderstand what you read.
Install PDO
The ./config --with-pdo-mysql is something you have to put on only if you compile your own PHP code. If you install it with package managers, you just have to use the command line given by Jany Hartikainen...
When to catch java.lang.Error?
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@SpaceTrucker: does that approach work well in multithreaded applications, or is there a significant risk that smaller allocations in other threads fail because of it? … presumably only if your arrays were just small enough to be allocated, but left nothing for anyone else.
...
How does the getView() method work when creating your own custom adapter?
...the UI element using findViewById().
Why do all the articles that I've read check if convertview is null or not first? What does it mean when it is null and what does it mean when it isn't?
This is an interesting one. You see, getView() is called everytime an item in the list is drawn. Now, be...
Setting different color for each series in scatter plot on matplotlib
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so it is kinda complicated to read and in 2013 I used python for 1 year. so why would people want to know how to do it? after get it worked, I never bother to look at it again. my project was to draw a lot of visualisation, with above code, the work flow ...