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You can index virtual columns, collect statistics on them, and create integrity constraints.
Thus, they can be treated much as nonvirtual columns.
You can also specify table columns for which data is encrypted before being stored in the datafile.
Encryption prevents users from circumventing database access control mechanisms by looking inside datafiles directly with operating system tools.
Oracle Database does not store data for the null column.
Also, for trailing null columns, Oracle Database does not even store the column length.
Table data can then be queried, deleted, or updated using SQL. When you create a table, Oracle Database automatically allocates a data segment in a tablespace to hold the table's future data.
After the row header information, each row contains column length and data.
After you create a table, insert rows of data using SQL statements.
A row is a collection of column information corresponding to a single record.
Going into 2018, here are a few things you should know.
These days, enterprises have to track new metrics such as engagement, revenue per user, and the overall customer journey, which involve blending a complex web of data streams into a comprehensive marketing and sales funnel.