(Continued from previous part...)

What does + mean in REGEXP?

At least one character. Appendix G. Regular Expressions from MySQL manual is worth perusing before the interview.

How do you get the month from a timestamp?

SELECT MONTH(techinterviews_timestamp) from techinterviews_questions;

How do you offload the time/date handling to MySQL?

SELECT DATE_FORMAT(techinterviews_timestamp, ‘%Y-%m-%d’) from techinterviews_questions; A similar TIME_FORMAT function deals with time.

How do you add three minutes to a date?

ADDDATE(techinterviews_publication_date, INTERVAL 3 MINUTE)

What’s the difference between Unix timestamps and MySQL timestamps?

Internally Unix timestamps are stored as 32-bit integers, while MySQL timestamps are stored in a similar manner, but represented in readable YYYY-MM-DD HH:MM:SS format.

How do you convert between Unix timestamps and MySQL timestamps?

UNIX_TIMESTAMP converts from MySQL timestamp to Unix timestamp, FROM_UNIXTIME converts from Unix timestamp to MySQL timestamp.

What are ENUMs used for in MySQL?

You can limit the possible values that go into the table. CREATE TABLE months (month ENUM ‘January’, ‘February’, ‘March’,…); INSERT months VALUES (’April’);

(Continued on next part...)