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How to get a reversed list view on a list in Java?
...ith an original list that is modifiable, changes to both the original list and the view are reflected in the other.
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SQL - many-to-many table primary key
...ving a primary key on (col1,col2) is guaranteed unique (assuming your col1 and col2 values in the referenced tables are unique) and a separate index on (col2,col1) will catch those cases where the opposite order would execute faster. The surrogate is a waste of space.
You won't need indexes on the ...
How do I duplicate a whole line in Emacs?
I saw this same question for VIM and it has been something that I myself wanted to know how to do for Emacs. In ReSharper I use CTRL-D for this action. What is the least number of commands to perform this in Emacs?
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How to declare an array in Python?
...t can hold a heterogenous collection of objects (their types do not matter and can be freely mixed). This should not be confused with the array module, which offers a type closer to the C array type; the contents must be homogenous (all of the same type), but the length is still dynamic.
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How do I update my bare repo?
... doesn't show these updates in the bare repo. (Neither does git log --all, and neither does a working repo that created by cloning the bare repo - either via git log --all or by simply looking at new files that should show up there). It's a pretty quick test to see for yourself. Mostly I'm just curi...
How to override trait function and call it from the overridden function?
... You can't access its members directly. It's basically just automated copy and paste...
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C read file line by line
... those who said that this getline is specific to GNU libc, "Both getline() and getdelim() were originally GNU extensions. They were standardized in POSIX.1-2008."
– willkill07
Apr 21 '15 at 21:01
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Get epoch for a specific date using Javascript
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You can create a Date object, and call getTime on it:
new Date(2010, 6, 26).getTime() / 1000
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Cannot ping AWS EC2 instance
...cho Request", I got confused by this for a moment.
– Andy
Jul 10 '18 at 15:23
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SQLite - UPSERT *not* INSERT or REPLACE
...no-op if the INSERT would violate a uniqueness constraint. UPSERT is not standard SQL. UPSERT in SQLite follows the syntax established by PostgreSQL.
GOOD but tendous: This will update 2 of the columns.
When ID=1 exists, the NAME will be unaffected.
When ID=1 does not exist, the name will be the...