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Postgres: How to do Composite keys?
...T NULL,
tag_id SERIAL NOT NULL,
tag1 VARCHAR(20),
tag2 VARCHAR(20),
tag3 VARCHAR(20),
PRIMARY KEY(question_id, tag_id)
);
NOTICE: CREATE TABLE will create implicit sequence "tags_tag_id_seq" for serial column "tags.ta...
How to find a hash key containing a matching value
... value. If
not found, returns nil.
h = { "a" => 100, "b" => 200 }
h.index(200) #=> "b"
h.index(999) #=> nil
So to get "orange", you could just use:
clients.key({"client_id" => "2180"})
sha...
Pretty-print an entire Pandas Series / DataFrame
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edited Sep 20 '18 at 20:14
Acumenus
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How to check if a database exists in SQL Server?
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SteveC
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answered Mar 24 '09 at 20:05
eKek0eKek0
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Is there a range class in C++11 for use with range based for loops?
...ou could also use boost::irange, which is a bit more focused in scope.
C++20's range library will allow you to do this via view::iota(start, end).
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How to construct a WebSocket URI relative to the page URI?
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leedm777
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answered May 2 '12 at 16:39
kanakakanaka
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How to move one word left in the vi editor
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answered Dec 20 '10 at 21:04
WazeryWazery
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Print new output on same line [duplicate]
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answered Aug 20 '12 at 4:19
DSMDSM
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Checking if all elements in a list are unique
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answered Mar 11 '11 at 20:47
yanyan
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undefined method `source_index' for Gem:Module (NoMethodError)
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edited Apr 4 '13 at 20:53
Brad Werth
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answe...