These are the basic variables in SQL
INT
M are the digits before the decimal, N are the digits after the decimal
DECIMAL(M,N)
VARCHAR(1)
VARCHAR are for strings, the length goes inside of the ()
BLOB are for binary files like pdfs, images, and audio
BLOB
DATE
format for DATE is YYYY-MM-DD
TIMESTAMP
format for TIMESTAMP is YYYY-MM-DD HH:MM:SS