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SQL Set Operators

SQL Set Operators   Traditional Set Operators: Union Compatibility:     Requirement for the traditional set operators.    Strong requirement.                         - Same number of columns.                         - Each corresponding column is compatible.                         - Positional correspondence.     Apply to similar tables by removing columns first. SQL UNION Example:           Example 1: Retrieve basic data about all university people.                     SELECT FacNo AS PerNo, FacFirstName                                      ...
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Differences Between Algorithm and Pseudocode

 

"Differences Between Algorithm and Pseudocode"

Algorithm

Pseudocode

1.      Systematic logical approach which is a well-defined, step-by-step procedure that allows a computer to solve a problem.

It is a simpler version of a programming code in plain English which uses short phrases to write code for a program before it is implemented in a specific programming language.

2.      Algorithms can be expressed using natural language, flowcharts, etc.

There are several formats which are used to write pseudo-codes and most of them take down the structures from languages such as C, Lisp, FORTRAN, etc.

3.     Procedure of algorithm is like this

Start from the leftmost element of arr[] and

one by one compare x with each element of arr[].

If x matches with an element, return the index.

If x doesn’t match with any of elements, return -1.




Procedure of pseudocode is like this

FUNCTION linearSearch(list, searchTerm):
     FOR index FROM 0 -> length(list):
       IF list[index] == searchTerm THEN
           RETURN index
       ENDIF
       ENDLOOP
           RETURN -1
END FUNCTION

 

 



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SQL Set Operators

SQL Set Operators   Traditional Set Operators: Union Compatibility:     Requirement for the traditional set operators.    Strong requirement.                         - Same number of columns.                         - Each corresponding column is compatible.                         - Positional correspondence.     Apply to similar tables by removing columns first. SQL UNION Example:           Example 1: Retrieve basic data about all university people.                     SELECT FacNo AS PerNo, FacFirstName                                      ...
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