Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
In performance terms, what will be faster, use a BIT(1) NULL (null = unknown, 0 = male, 1 = female) or ENUM('unknown', 'male', 'female') NOT NULL DEFAULT 'unknown' in MySQL MyISAM?
Or this is considered micro-optimization?
[EDIT]
I think I’m going to use ENUM('male', 'female') DEFAULT NULL
Yes, this is microoptimization. Performance will be dominated by other things, and anyway nullable fields take more space (for a null flag) so use the meaningful enumeration.