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Those restrictions are documented in the context of the relevant SQL syntax.The Oracle precompilers recognize other datatypes in embedded SQL programs.The table that follows summarizes Oracle built-in datatypes.Please refer to the syntax in the preceding sections for the syntactic elements.The text of this section is divided into the following sections: A datatype is either scalar or nonscalar.A scalar type contains an atomic value, whereas a nonscalar (sometimes called a "collection") contains a set of values.Each value subsequently placed in a column assumes the datatype of the column.
The syntax of Oracle datatypes appears in the diagrams that follow.
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These datatypes define the domain of values that each column can contain or each argument can have.
For example, columns cannot accept the value February 29 (except for a leap year) or the values 2 or 'SHOE'.