Data types specify the type of data for a particular column.If a column called “LastName” is going to hold names, then that particular column should have a “varchar” (variable-length character) data type.The most common data types:
SQL Datatypes – Numeric
INT -A normal-sized integer that can be signed or unsigned.
FLOAT(M,D) – A floating-point number that cannot be unsigned. You can optionally define the display length (M) and the number of decimals (D).
DOUBLE(M,D) – A double precision floating-point number that cannot be unsigned. You can optionally define the display length (M) and the number of decimals (D).
SQL Datatypes – Date and Time
DATE – A date in YYYY-MM-DD format.
DATETIME – A date and time combination in YYYY-MM-DD HH:MM:SS format.
TIMESTAMP – A timestamp, calculated from midnight, January 1, 1970
TIME – Stores the time in HH:MM:SS format.
SQL Datatypes – String Type
CHAR(M) – Fixed-length character string. Size is specified in parenthesis. Max 255 bytes.
VARCHAR(M) – Variable-length character string. Max size is specified in parenthesis.
BLOB – “Binary Large Objects” and are used to store large amounts of binary data, such as images or other types of files.
TEXT – Large amount of text data.
This is a simple article about “SQL Datatypes”. I hope you understand all of this.