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How to set an environment variable only for the duration of the script?
...s to run vblank_mode=0 glxgears. It works, but it also says vblank_mode=0: command not found after running, whereas prepending env doesn't cause this. [testing...] Apparently zsh doesn't like it (yet still uses it correctly), but bash is fine with it. I guess I'll go with the env method from now on....
How find all unused classes in Intellij Idea?
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Press Ctrl+Shift+A (in Mac Command+Shift+A)
Enter "unused declar"
Double-click on "Unused declaration"
Settings will pop up
Click on Java/Declaration redundancy/Unused declaration
on the right bottom select "On the fly editor settings"
untick check...
SET versus SELECT when assigning variables?
...iable to null prior to the select. Once you factor that in, how do the two compare for performance? (Side note: I don't understand the rationale for select not setting your variable to null in the event a query returns null. When would you ever want that?)
– youcantryreachingme...
Find an element in DOM based on an attribute value
...ery (or equivalent) is probably the easiest especially to be cross browser compatible without having to know what that requires.
– Alexis Wilke
Dec 8 '14 at 4:33
1
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EJB's - when to use Remote and/or local interfaces?
...s that it is easy to scale (which I believe means you can deploy different components on different servers). Is that where Remote and Local interfaces come in? Are you supposed to use Remote interfaces if you expect your application to have different components on different servers? And use Local in...
How to REALLY show logs of renamed files with git?
...with "pickaxe" functionalitly (e.g. log -S).
Other "path" changes include combining and splitting files; git doesn't really care which file you consider renamed and which one you consider copied (or renamed and deleted) it just tracks the complete content of your tree.
git encourages "whole tree" ...
Why are properties without a setter not serialized
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@James I wrote the above because i got some compile time errors when I tried the same. Now, when I got back to my code and removed the setter, it seems to compiling fine. This is very wierd and probably homework for me to research more on this.
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How to RSYNC a single file?
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edited Aug 24 at 9:00
Community♦
111 silver badge
answered Feb 15 '13 at 4:36
Michael PlaceMichael...
Select rows which are not present in other table
....ip
WHERE i.ip IS NULL;
EXCEPT
Short. Not as easily integrated in more complex queries.
SELECT ip
FROM login_log
EXCEPT ALL -- "ALL" keeps duplicates and makes it faster
SELECT ip
FROM ip_location;
Note that (per documentation):
duplicates are eliminated unless EXCEPT ALL is used.
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