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LOBs are subject to some restrictions that do not affect other scalar types because of their size.Those restrictions are documented in the context of the relevant SQL syntax.The Oracle precompilers recognize other datatypes in embedded SQL programs. The datatype of a value associates a fixed set of properties with the value.These properties cause Oracle to treat values of one datatype differently from values of another. When you create a table or cluster, you must specify a datatype for each of its columns.When you create a procedure or stored function, you must specify a datatype for each of its arguments.
A scalar type contains an atomic value, whereas a nonscalar (sometimes called a "collection") contains a set of values.
A large object (LOB) is a special form of scalar datatype representing a large scalar value of binary or character data.
For example, columns cannot accept the value February 29 (except for a leap year) or the values 2 or 'SHOE'.
Each value subsequently placed in a column assumes the datatype of the column.
For example, if you insert value after verifying that it translates to a valid date.
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Oracle Database provides a number of built-in datatypes as well as several categories for user-defined types that can be used as datatypes.