Overview of control structures-comparison operators, PL-SQL Programming

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Overview of control structures

According 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.

 

 

2283_Overview of control structures-comparison operators.jpg

 

                                                       Figure: Control Structures


The 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.


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