Overview of Oracle Database Object Types and column data types

The primary data types of the database are Allobjecthavaanameandatype and andeachobjectisownedbyaschema. -- query the primary object classes of the database.

The main data types of the database are All object hava name and atype, and each object is owned by a schema. -- query the main object classes of the database.

NUMBER

Precision (1 to 38) sacle (-84,127)

NUMBER (precision, scale)
Precision indicates the valid digit in the number. If precision is not specified, Oracle uses 38 as the precision.
Scale indicates the number of digits to the right of the decimal point. scale is set to 0 by default. If scale is set to a negative number, Oracle will select this number to the specified number to the left of the decimal point.

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