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How do I ALTER a PostgreSQL table and make a column unique?
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edited May 23 '17 at 12:02
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answered Jan 22 '09 at 15:22
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spring boot default H2 jdbc connection (and H2 console)
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How to get the changes on a branch in Git
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187
In the context of a revision list, A...B is how git-rev-parse defines it. git-log takes a revi...
PHP Composer update “cannot allocate memory” error (using Laravel 4)
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More details here:
https://github.com/composer/composer/issues/1898#issuecomment-23453850
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What's the difference between Ruby's dup and clone methods?
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class Foo
attr_accessor :bar
end
o = Foo.new
o.freeze
o.dup.bar = 10 # succeeds
o.clone.bar = 10 # raises RuntimeError
The Rubinius implementation for these methods
is often my source for answers to these questions, since it is quite clear, and a fairly compliant Ruby implementation.
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How to convert/parse from String to char in java?
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Django URL Redirect
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182
You can try the Class Based View called RedirectView
from django.views.generic.base import Re...
Latex Remove Spaces Between Items in List
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172
It's easier with the enumitem package:
\documentclass{article}
\usepackage{enumitem}
\begin{d...
In Postgresql, force unique on combination of two columns
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CREATE TABLE someTable (
id serial primary key,
col1 int NOT NULL,
col2 int NOT NULL,
unique (col1, col2)
)
autoincrement is not postgresql. You want a serial.
If col1 and col2 make a unique and can't be null then they make a good primary key:
CREATE TABLE someTab...
How to find the lowest common ancestor of two nodes in any binary tree?
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