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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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