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data type, define precision and scale instead of width. You can invoke Transparent Data Encryption to encrypt data before storing it.A row is a collection of column information corresponding to a single record. If users attempt to circumvent the database access control mechanisms by looking inside Oracle data files directly with operating system tools, encryption prevents these users from viewing sensitive data. A is like any other table column, except that its value is derived by evaluating an expression.
Table data can then be queried, deleted, or updated using SQL.
Integrity constraints can be defined on the columns of a table to enforce the business rules of your database automatically.
A clustered table is a table that is part of a cluster.
You can specify compression for a tablespace, a table, or a partition.
If specified at the tablespace level, then all tables created in that tablespace are compressed by default.