shashankmehta

First install Brew on your MAC

• Setup Brew: ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
• brew update
• brew tap homebrew/dupes
• brew tap homebrew/php
• Install PHP 7.0.+ brew install php70
• Install mcrypt: brew install mcrypt php70-mcrypt
• Finally, install composer: brew install composer

scaryguy

-- Firstly, remove PRIMARY KEY attribute of former PRIMARY KEY
ALTER TABLE <table_name> DROP CONSTRAINT <table_name>_pkey;

-- Then change column name of  your PRIMARY KEY and PRIMARY KEY candidates properly.
ALTER TABLE <table_name> RENAME COLUMN <primary_key_candidate> TO id;