MYSQL DATA TYPES PLUS
MYSQL DATA TYPES SERIES

Like ENUM except that each column can have more than one of several possible values. Short for enumeration, which means that each column can have one of several possible values. Stores binary data with a maximum length of 4,294,967,295 bytes. Stores binary data with a maximum length of 16,777,215 bytes. Stores binary data with a maximum length of 65,535 bytes. Stores binary data with a maximum length of 255 bytes. Similar to VARCHAR but stores binary data. MySQL Text TypesДЄ fixed-length field from 0 to 255 characters long.ДЄ fixed-length field from 0 to 255 characters long (65,535 characters long as of MySQL 5.0.3).ДЄ string with a maximum length of 255 characters.ДЄ string with a maximum length of 65,535 characters.ДЄ string with a maximum length of 16,777,215 characters.ДЄ string with a maximum length of 4,294,967,295 characters. Here are the most common column types for storing text in a MySQL database. There are two caveats with ENUM and SET: These types are not supported by other databases, and their usage undermines normalization. An ENUM field can have only one of a possible several thousand values, while SET allows for several of up to 64 possible values.

MYSQL DATA TYPES SERIES

There are also two extensions of the text types that result in a different behavior ENUM and SETwhich allow you to define a series of acceptable values when creating the table. Mostly these differ in size, but several allow for storing binary data instead of strings of characters. Range of 128 to 127 or 0 to 255 unsigned. (As of MySQL 5.0.3, the size of DECIMAL column is based upon a formula.) MySQL Numeric Types For FLOAT, DOUBLE, and DECIMAL, the Length argument is the maximum total number of digits and the Decimals argument dictates the number of that total to be found after the decimal point. Here are most of the available numeric column types for use with MySQL databases. After that it's a matter of the range of possible values (for integers) or what level of precision is necessary (for real numbers). The biggest distinction is between integer types and real numbers (which contain decimal points). Many of the types can take an optional Length attribute, limiting their size (in the corresponding tables, the square brackets,, indicate an optional parameter to be put in parentheses, while parentheses themselves indicate required arguments). Choosing your column types correctly not only dictates what information can be stored and how but also affects the database's overall performance. Within each of these, there are a number of variantssome of which are MySQL-specificyou can use. There are three primary categories, as is true for almost every database application: When creating the database, as you will do at the end of this chapter, MySQL requires that you define what sort of information each field will contain. Stores universally unique identifiers (UUIDs).Once you have identified all of the tables and columns that the database will need, you should determine each column's data type.

MYSQL DATA TYPES PLUS

Signed 64-bit integer, requiring 8 bytes of storageДЁ bytes for the first 18 digits of precision, plus 8 bytes for each additional 19 digitsД¬oordinates expressed as ( x, y) pairs, defined in the Cartesian plane.Д¬oordinates expressed in longitude/latitude angular values, measured in degrees Signed 64-bit IEEE floating point number, requiring 8 bytes of storage Represents an interval measured in years and months Represents an interval measured in days and seconds Measures the difference between two points in time Represents a date and time without timezone Represents a time of day without timezone The Size column lists uncompressed bytes. It also shows the default placement of null values in projections. The following table summarizes the data types that Vertica supports.

Mysql data types