Posts Tagged ‘1Z0-007’

The DECODE function decodes a column value or an expression and compares it with each specified search value, one by one. If the expression matches a search value, a result value corresponding to the matching search value is returned. If no match is found, a default result value, if included, is returned. However, if no default value is included, a NULL value is returned. The DECODE function is one of the few single-row functions that directly deal with NULL values. It can compare two NULL values and can return a NULL value.

Following is the syntax for creating a view:

CREATE [OR REPLACE] [FORCE | NOFORCE] VIEW ViewName
[ (alias [, alias]…) ]
AS subquery
[WITH { READ ONLY | CHECK OPTION [CONSTRAINT ConstraintName] }];

where,

Top-n analysis is performed when the n topmost or the n bottommost records from a table are to be displayed. For example, top-n analysis can be performed in the following conditions:

A tablespace is a logical database structure for storing database segments. By default, each Oracle database has a single tablespace, known as SYSTEM, which stores data dictionary tables and indexes. Other tablespaces may also be configured for a database for performing some specific tasks such as:

• Partial backup and recovery operation
• Allocation of quotas for users

Additional tablespaces can also be created as per the requirements of the applications installed on the system. Such tablespaces can be used for storing application specific segments.

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The DECODE function decodes a column value or an expression and compares it with each specified search value, one by one. If the expression matches a search value, a result value corresponding to the matching search value is returned. If no match is found, a default result value, if included, is returned. However, if no default value is included, a NULL value is returned. The DECODE function is one of the few single-row functions that directly deal with NULL values. It can compare two NULL values and can return a NULL value.