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Timer & TimerTask versus Thread + sleep in Java
...threading issues (such as avoiding deadlocks etc.). And of course it is usually better to use well-tested standard code instead of some homemade solution.
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How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
...of PostgreSQL
In old versions of PostgreSQL (prior to 8.x?) you had to do all the dirty work. The following sequence of commands should do the trick:
ALTER TABLE test1 ADD COLUMN id INTEGER;
CREATE SEQUENCE test_id_seq OWNED BY test1.id;
ALTER TABLE test ALTER COLUMN id SET DEFAULT nextval('...
Bash script error [: !=: unary operator expected
...
Or for what seems like rampant overkill, but is actually simplistic ... Pretty much covers all of your cases, and no empty string or unary concerns.
In the case the first arg is '-v', then do your conditional ps -ef, else in all other cases throw the usage.
#!/bin/sh
case $1...
How do you remove a specific revision in the git history?
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git rebase -i <after-this-commit>
An editor will be fired up with all the commits in your current branch (ignoring merge commits), which come after the given commit. You can reorder the commits in this list to your heart's content, and you can remove them. The list looks more or less like t...
Convert Time from one time zone to another in Rails
...ious reply it's suggested to use a before_filter to set the timezone temporally.
You should never, ever do that because Time.zone stores the information in the thread, and it will probably leak to the next request handled by that thread.
Instead you should use an around_filter to make sure that t...
How to align checkboxes and their labels consistently cross-browsers
...lems that plagues me constantly. How do folks around Stack Overflow vertically align checkboxes and their labels consistently cross-browser ? Whenever I align them correctly in Safari (usually using vertical-align: baseline on the input ), they're completely off in Firefox and IE. Fix it ...
Difference between .on('click') vs .click()
....on over .click because the former can use less memory and work for dynamically added elements.
Consider the following html:
<html>
<button id="add">Add new</button>
<div id="container">
<button class="alert">alert!</button>
</div>
<...
“You are on a branch yet to be born” when adding git submodule
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I've verified all of these things. When I check out the desired repo to another directory, it has many files, and a master branch. The repo I am trying to add this one to as a submodule is on the master branch, has no obvious problems (sta...
IntelliJ: Working on multiple projects
...oes not cover them. The two answers tackle different situations and are equally relevant, no one is better than the other.
– luk2302
Jul 13 '17 at 7:48
2
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Linq: What is the difference between Select and Where
...rable<A> in, IEnumerable<A> out
Select
returns something for all items in the source (projection / transformation). That something might be the items themselves, but are more usually a projection of some sort.
-> IEnumerable<A> in, IEnumerable<B> out
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