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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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 d. Insert a new row in the Location table related to the Facility row in modification problem (c). The new row should have “Door” for the location name.


Query Formulation + Result Snapshot












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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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Query Formulation

Query Formulation   Query Formulation Process: Critical Questions: What tables?           - Columns in result.          - Conditions to test (including join conditions). How to combine the tables?           - Usually join of PK to FK. More complex ways to combine Individual rows or groups of rows?           - Aggregate functions in result.          - Conditions with aggregate functions. University Database Diagram: Summarization and Joins 1:      Example 1: List the number of students enrolled in each 2017 course offering showing the offer number and number of students in the result.                SELECT Offering.OfferNo,                                     COUNT (*) AS NumSt...
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Sorting Operations

  Kinds Of Sorting Operations ·          Bubble Sort Bubble sort is a type of sorting. It is used for sorting 'n' (number of items) elements. It compares all the elements one by one and sorts them based on their values. The above diagram represents how bubble sort actually works. This sort takes O (n 2 ) time. It starts with the first two elements and sorts them in ascending order. Bubble sort starts with first two elements. It compares the element to check which one is greater.   ·          Insertion Sort Insertion sort is a simple sorting algorithm. This sorting method sorts the array by shifting elements one by one. It builds the final sorted array one item at a time. Insertion sort has one of the simplest implementation. This sort is efficient for smaller data sets but it is insufficient for larger lists. It has le...
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