SQLBase Example Scripts for “The Join Operation”


This section contains the create and insert code to run the examples from Chapter 4 in an Gupta/Unify SQLBase database.

CREATE TABLE sales (
  sale_id       INTEGER NOT NULL,
  employee_id   INTEGER NOT NULL,
  subsidiary_id INTEGER NOT NULL,
  sale_date     DATE   NOT NULL,
  eur_value     DECIMAL(13,2) NOT NULL,
  product_id    INTEGER NOT NULL,
  quantity      INTEGER NOT NULL,
  junk          CHAR(200),
  PRIMARY KEY (sale_id),
  FOREIGN KEY (subsidiary_id, employee_id)
   REFERENCES employees
);

CREATE UNIQUE INDEX sales_pk ON sales (sale_id);

INSERT INTO sales (sale_id
                 , subsidiary_id, employee_id
                 , sale_date, eur_value
                 , product_id, quantity
                 , junk)
       SELECT gen.n *2000*30 + e.employee_id * 30 + e.subsidiary_id AS sale_id
            , e.subsidiary_id, e.employee_id
            , SYSDATE - @mod(n+@MICROSECOND(@NOW), 10*365) AS  sale_date
            , (@MOD(@MICROSECOND(@NOW)+n, 9000) + 1000)/100 AS eur_value
            , @MOD(@SECOND(@NOW)+n/9000*29,29) AS product_id
            , @MOD(@SECOND(@NOW)+n/9000*26,5) AS quantity
            , 'junk'
         FROM employees e
          , generator_4k gen
        WHERE @MOD(employee_id, 7) = 4
              AND gen.n < 1800
          AND gen.n < employee_id / 5 ;

Notes:

  • The rows are NOT inserted chronologically

  • Only a small fraction of employees have sales at all.

About the Author

Photo of Markus Winand
Markus Winand tunes developers for high SQL performance. He also published the book SQL Performance Explained and offers in-house training as well as remote coaching at http://winand.at/