MySQL: PRIMARY KEYS are easy

#MySQL #tutorial #course 00:00:00 introduction 00:00:46 PRIMARY KEY with a new table 00:01:34 PRIMARY KEY with an existing table 00:02:11 examples 00:04:56 conclusion – EXAMPLE 1 -- CREATE TABLE transactions ( transaction_id INT PRIMARY KEY, amount DECIMAL(5, 2) ); – EXAMPLE 2 -- ALTER TABLE transactions ADD CONSTRAINT PRIMARY KEY (transaction_id);