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Overview of control structuresAccording to the structure theorem, any computer program can be written by using the basic control structures as shown in figure below. They can be combined in any way but is necessary to deal with the given problem.
Figure: Control StructuresThe selection structure tests the condition, and then executes one sequence of statements as an alternative of another, depending on whether the condition is true or false. The condition is any variable or expression that returns a Boolean value (TRUE or FALSE). The iteration structure executes a series of statements repetitively as long as a condition holds true. The sequence of structure simply executes a sequence of the statements in the order in which they occur.
Using Pragma RESTRICT_REFERENCES: The function called from the SQL statements should obey certain rules meant to control the side effects. To check for violation of the rules,
Effects of NULL for UNIQUE Specification When a UNIQUE specification u for base table t includes a column c that is not subject to a NOT NULL constraint, the appearance of sev
Using EXTEND To enlarge the size of a collection, use EXTEND. This process has 3 forms. The EXTEND appends one null element to a collection. And the EXTEND(n) appends n null e
Organi c Evolution Evolution is a slow continuous, irreversible and natural process of change to give rise to advance and diverse forms of life i.e. formation of new specie
Creating and Destroying Base Tables: Example shows an SQL command to create the base table counterpart of the ENROLMENT variable Example Creating a base table. CREATE T
The Package Body The package specification is implemented by the package body. That is, the package body has the definition of every cursor and the subprogram declared in the p
Bitmap Join Indexes - This feature will increase the performance and detains the size and format of your databases in data Character Semantics and Globalization -This featur
If two relations R and S are joined, then the non matching tuples of both R and S are ignored in __________________.
IN OUT Mode An IN OUT parameter passes initial values to the subprogram being called and return efficient values to the caller. Within the subprogram, an IN OUT parameter acts
Use Object Types and Collections The Collection types and object types increase your efficiency by allowing for the realistic data modeling. The Complex real-world entities an
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