Wednesday, March 19, 2008

Date, time and enumeration data


A third common type of data is date and time data. Data stored as a date can be displayed in a variety of date formats. It can also be used to determine the length of time between two dates or two times — or between a specific date or time and some arbitrary date or time.

Sometimes data can have only a limited number of values. For example, the only possible values for a column might be yes or no. MySQL provides a data type called enumeration for use with this type of data. You tell MySQL what values can be stored in the column (for example, yes, no), and MySQL will not store any other values in the column.

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