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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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CREATE TABLE Syntax

CREATE TABLE Syntax

CREATE TABLE <table-name> ( <column-list> [<constraint-list>] ).

Column list with data types and optional and inline constraints.

Optional external constraint list 

CONSTRAINT [ ConstraintName ] <Constraint-Spec> 

        Primary key 

        Foreign key 

        Unique 

        Check

CREATE TABLE Statement Example

CREATE TABLE Student 

        ( StdNo CHAR(11), 

        StdFirstName VARCHAR(50), 

        StdLastName VARCHAR(50), 

        StdCity VARCHAR(50), 

        StdState CHAR(2), 

        StdZip CHAR(10), 

        StdMajor       CHAR(6), 

        StdClass       CHAR(6), 

        StdGPA DECIMAL(3,2) );


Common SQL Data Types:

        CHAR(L) 
        VARCHAR(L) 
        INTEGER FLOAT(P) 
        DECIMAL(W, R) 
        Date/Time: DATE, TIME, TIMESTAMP 
        BOOLEAN




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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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