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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
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psql's inline help:
\h ALTER TABLE
Also documented in the postgres docs (an excellent resource, plus easy to read, too).
ALTER TABLE tablename ADD CONSTRAINT constraintname UNIQUE (columns);
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is of a type that is invalid for use as a key column in an index
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A unique constraint can't be over 8000 bytes per row and will only use the first 900 bytes even then so the safest maximum size for your keys would be:
create table [misc_info]
(
[id] INTEGER PRIMARY KEY IDENTITY NOT NULL...
Difference between Xcode version (CFBundleShortVersionString) and build (CFBundleVersion)
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The Apple document "Information Property List Key Reference" says that CFBundleShortVersionString represents a release version, whereas CFBundleVersion represents any build, released or not. Also, CFBundleShortVersionString can be locali...
How to change ViewPager's page?
I'm using ViewPager in my app and define it in the main Activity. Inside onCreate method I load some number of pages from SharedPreferences and then pass it to PagerAdapter:
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How can I make a JUnit Test wait?
I have a JUnit test that I want to have wait for a period of time, synchronously. My JUnit test looks like this:
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Unresolved external symbol on static class members
Very simply put:
5 Answers
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How to set up a git project to use an external repo submodule?
I'd like to create a repo which pulls in a remote repo.
4 Answers
4
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What is digest authentication?
How does Digest Authentication differ from Basic Authentication other than sending credentials as plain text?
3 Answers
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Intersection of two lists in Bash
I'm trying to write a simple script that will list the contents found in two lists. To simplify, let's use ls as an example. Imagine "one" and "two" are directories.
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express.js - single routing handler for multiple routes in a single line
Is there a way to make this on a single function call?
6 Answers
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