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Is it a good idea to index datetime field in mysql?
... But if you query the data with date range, such as data range from "2017-01-01 11:20" to "2018-01-03 12:12", it doesn't make SELECT query faster even though I indexed date time column... index make query fast when I use equal operation.. Am i right?
– user3595632
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Once upon a time, when > was faster than < … Wait, what?
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answered Sep 7 '11 at 20:34
Nicol BolasNicol Bolas
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Hex representation of a color with alpha channel?
...r 4th character of a 4 digit hex colour (see CSS Level 4 spec*)
As of May 2019, >80% of users can be expected to understand the #RGBA format
Firefox has supported this syntax since Firefox 49 (Mozilla bug 567283).
Safari has supported this syntax since Safari 10.
Chrome has supported this synt...
How to output messages to the Eclipse console when developing for Android
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m6ttm6tt
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How to convert a ruby hash object to JSON?
...y, though).
So, take a look here:
car = {:make => "bmw", :year => "2003"}
# => {:make=>"bmw", :year=>"2003"}
car.to_json
# NoMethodError: undefined method `to_json' for {:make=>"bmw", :year=>"2003"}:Hash
# from (irb):11
# from /usr/bin/irb:12:in `<main>'
require 'jso...
Why does Go have a “goto” statement
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answered Feb 16 '16 at 20:26
GustavGustav
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ERROR: permission denied for sequence cities_id_seq using Postgres
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Tom GerkenTom Gerken
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How do I pass extra arguments to a Python decorator?
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KatrielKatriel
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When does Java's Thread.sleep throw InterruptedException?
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edited May 20 '19 at 8:02
community wiki
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ModelState.AddModelError - How can I add an error that isn't for a property?
...c (key = "") errors if its argument is true.
– Suncat2000
Jan 4 '17 at 15:04
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