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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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Algorithm For Quick Sort

 


"Algorithm For Quick Sort"

Step 1:     Choose the highest index value as pivot.

Step 2:     Take two variables to point left and right of the list excluding pivot.

Step 3:     Left points to the low index.

Step 4:     Right points to the high index.

Step 5:     While value at left < (Less than) pivot move right.

Step 6:     While value at right > (Greater than) pivot move left.

Step 7:     If both Step 5 and Step 6 does not match, swap left and right.

Step 8:     If left = (Less than or Equal to) right, the point where they met is new pivot.





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