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What is the most efficient/elegant way to parse a flat table into a tree?
...id, descendant_id) VALUES
(1,1), (1,2), (1,4), (1,6),
(2,2), (2,4),
(3,3), (3,5),
(4,4),
(5,5),
(6,6);
Now you can get a tree starting at node 1 like this:
SELECT f.*
FROM FlatTable f
JOIN ClosureTable a ON (f.id = a.descendant_id)
WHERE a.ancestor_id = 1;
The output (in MySQL c...
What is a lambda expression in C++11?
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1535
The problem
C++ includes useful generic functions like std::for_each and std::transform, which...
IntelliJ shortcut to show a popup of methods in a class that can be searched
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edited May 23 '18 at 17:38
answered Oct 21 '10 at 22:04
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How to save a dictionary to a file?
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edited Nov 21 '19 at 4:33
semyonfilippov
311 bronze badge
answered Oct 5 '13 at 18:50
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How to print number with commas as thousands separators?
... commas as thousands separators. For example, I want to show the number 1234567 as 1,234,567 . How would I go about doing this? I have seen many examples on Google, but I am looking for the simplest practical way.
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How to refresh app upon shaking the device?
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317
Here is an example code.
Put this into your activity class:
/* put this into your activity ...
LEFT JOIN only first row
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edited Mar 25 '13 at 23:16
answered Mar 25 '13 at 23:10
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Does Javascript pass by reference? [duplicate]
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13 Answers
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Move branch pointer to different commit without checkout
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community wiki
13 revs, 11 users 21%Adam A
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Is there a way to 'uniq' by column?
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335
sort -u -t, -k1,1 file
-u for unique
-t, so comma is the delimiter
-k1,1 for the key field ...