By ensuring that the data types are consistent across multiple records, database applications can easily perform calculations, comparisons, searching and sorting of fields in different records. The student’s date of birth would be stored in a date format and the student’s GPA can be stored as decimal. For example, school record for a student may use a string data type for student’s first and last name. Database fields require distinct type of data to be entered. For example, if the data type attached to the variable is integer, when you assign a string data to the variable, the string data will be converted to an integer format.ĭatabase applications use data types. Most of the programming languages enable each variable to store only a single data type. For example, a variable is assigned with the value “3.75”, then the data type that will be attached to the variable is floating point. While some programming languages can automatically attach a data type to a variable based on the initial data assigned to the variable. There are programming languages that require the programmer to determine the data type of a variable before attaching a value to it. More specific data types are as follows: varchar (variable character) formats, Boolean values, dates and timestamps. Some common data types are as follows: integers, characters, strings, floating-point numbers and arrays. When computer programs store data in variables, each variable must be designated a distinct data type. Database data types refer to the format of data storage that can hold a distinct type or range of values.
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