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MySQL indexes - what are the best practices?
I've been using indexes on my MySQL databases for a while now but never properly learnt about them. Generally I put an index on any fields that I will be searching or selecting using a WHERE clause but sometimes it doesn't seem so black and white.
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A migration to add unique constraint to a combination of columns
...y want to add a constraint without an index. This will depend on what database you're using. Below is sample migration code for Postgres. (tracking_number, carrier) is a list of the columns you want to use for the constraint.
class AddUniqeConstraintToShipments < ActiveRecord::Migration
def...
How to handle AccessViolationException
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SyntaxError: Non-ASCII character '\xa3' in file when function returns '£'
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How do I send a JSON string in a POST request in Go
...de that is shorter, easy to use with json, and more maintainable in my codebase and production system.
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Is explicitly closing files important?
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How to revert a Git Submodule pointer to the commit stored in the containing repository?
...ning
repository. This will make the submodules HEAD be detached unless
--rebase or --merge is specified or the key submodule.$name.update
is set to rebase or merge.
Run this and all should be well:
git submodule update --init
You can add the --recursive flag as well to recurse through all submodul...
Difference between “module.exports” and “exports” in the CommonJs Module System
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What is the meaning of addToBackStack with null parameter?
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C/C++ macro string concatenation
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