MY_ASSIGNMNT

DATA TYPES

A. What are they?

B. What role do they play in a database?



C. Enumerate the datat types. Give the discription of each. 3 DBMS software

Data type Description
# (symbol) A self-contained unit that can be used to represent a condition or flag. For example, #list or #word.
Array (JavaScript syntax only) Although not literally a data type, an Array object can be used to work with linear lists of values. The functionality of an Array object is similar to that of the List data type in Lingo.
Boolean A value that is TRUE (1) or FALSE (0). In Lingo, all TRUE or FALSE values are simple integer constants, 1 for TRUE, 0 for FALSE. In JavaScript syntax, all true or false values are by default the actual Boolean true or false values, but are converted to simple integer constants automatically when required in Director.
In Lingo, TRUE and FALSE can be either lowercase or uppercase. In JavaScript syntax, true and false must always be lowercase.
Color Represents an object's color.
Constant A piece of data whose value does not change.
Date Although not literally a data type, in JavaScript syntax a Date object can be used to work with dates. In Lingo, use the date() method to create a Date object and work with dates.
Float (Lingo only) A floating-point number. For example, 2.345 or 45.43.
Function (JavaScript syntax only) Although not literally a data type, a Function object can be used to specify a string of code to run.
Integer (Lingo only) A whole number. For example, 5 or 298.
List A linear or property list made up of values or property names and values, respectively.
Math (JavaScript syntax only) Although not literally a data type, a Math object can be used to perform mathematical functions.
null (JavaScript syntax only) Denotes a variable whose value behaves as 0 in numeric contexts and as FALSE in Boolean contexts.
Number (JavaScript syntax only) Although not literally a data type, a Number object can be used to represent numerical constants, such as a maximum value, not-a-number (NaN), and infinity.
Object Although not literally a data type, an Object object can be used to create a custom named container that contains data and methods that act on that data.
Point A point on the Stage that has both a horizontal and vertical coordinate.
Rect A rectangle on the Stage.
RegExp (JavaScript only) A regular expression pattern that is used to match character combinations in strings.
String A contiguous sequence of keyboard symbols or character values. For example, "Director" or "$5.00".
undefined (JavaScript syntax only) Denotes a variable that does not have a value.
Vector A point in 3D space.
VOID (Lingo only) Denotes an empty value.

Example DBMS software
Oracle
Filemaker
MySQL