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How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...t's an EXAMPLE.
BEGIN;
UPDATE testtable
SET somedata = 'blah'
WHERE id = 2;
-- Remember, this is WRONG. Do NOT COPY IT.
INSERT INTO testtable (id, somedata)
SELECT 2, 'blah'
WHERE NOT EXISTS (SELECT 1 FROM testtable WHERE testtable.id = 2);
COMMIT;
then when two run at once there are several f...
How to mark a build unstable in Jenkins when running shell scripts
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edited Oct 29 '13 at 9:22
answered Nov 16 '11 at 8:10
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How to initialize an array's length in JavaScript?
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edited Jul 7 '15 at 15:21
answered Jan 31 '11 at 14:32
F...
How to smooth a curve in the right way?
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275
I prefer a Savitzky-Golay filter. It uses least squares to regress a small window of your data...
Viewing all defined variables [duplicate]
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answered Mar 11 '09 at 2:36
RedBlueThingRedBlueThing
38.7k1717 gold badges9393 silver badges119119 bronze badges
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SQlite Getting nearest locations (with latitude and longitude)
...method calculateDerivedPosition(...) calculates those points for you (p1, p2, p3, p4 in picture).
/**
* Calculates the end-point from a given source at a given range (meters)
* and bearing (degrees). This methods uses simple geometry equations to
* calculate the end-point.
*
* @param point
* ...
Ways to save enums in database
...ame Suit
================== ==========
Shelby Jackson 2
Ian Boyd 1
verses
Name Suit
================== ==========
Shelby Jackson Diamond
Ian Boyd Heart
the latter is much easier. The former required getting at the source code and f...
Facebook database design?
...----------------------------------
1 bob@bob.com bobbie M 1/1/2009 New York City
2 jon@jon.com jonathan M 2/2/2008 Los Angeles
3 joe@joe.com joseph M 1/2/2007 Pittsburgh
Table Friends
---------------
UserID FriendID
----------------
1 2
1 3
2 3
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Static constant string (class member)
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edited Nov 20 '19 at 15:54
answered Oct 14 '09 at 2:03
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How to replace multiple white spaces with one white space
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edited Feb 2 '12 at 23:41
Frank van Puffelen
362k4747 gold badges565565 silver badges579579 bronze badges
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