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Sass - Converting Hex to RGBa for background opacity
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Difference between os.getenv and os.environ.get
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What is the entry point of swift code execution?
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difference between use and require
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LINQ to SQL - Left Outer Join with multiple join conditions
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Rails migration: t.references with alternative name?
... two references lines. If you want to mark them as foreign keys at the database level you need to have a migration with this:
add_foreign_key :courses, :courses, column: :transferrable_as_id
add_foreign_key :courses, :courses, column: :same_as_id
Update
In Rails 5.1 and above you can add the foreig...
What is the difference between required and ng-required?
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Using the Swift if let with logical AND operator &&
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Using CSS how to change only the 2nd column of a table
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Generating a UUID in Postgres for Insert statement?
...it isn't loaded into the server by default. You must load it into your database to use it.
For modern PostgreSQL versions (9.1 and newer) that's easy:
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
but for 9.0 and below you must instead run the SQL script to load the extension. See the documentati...