SQLite Example Scripts for “The Join Operation”

This section contains the create and insert code to run the examples from Chapter 4, “The Join Operation” in an MySQL database.

CREATE TABLE sales (
  sale_id       NUMERIC NOT NULL,
  employee_id   NUMERIC NOT NULL,
  subsidiary_id NUMERIC NOT NULL,
  sale_date     DATE   NOT NULL,
  eur_value     NUMERIC(17,2) NOT NULL,
  product_id    NUMERIC NOT NULL,
  quantity      NUMERIC NOT NULL,
  junk          CHAR(200),
  CONSTRAINT sales_pk     
     PRIMARY KEY (sale_id),
  CONSTRAINT sales_emp_fk 
     FOREIGN KEY          (subsidiary_id, employee_id)
      REFERENCES employees(subsidiary_id, employee_id)
);

INSERT INTO sales (sale_id
                 , subsidiary_id, employee_id
                 , sale_date, eur_value
                 , product_id, quantity
                 , junk)
SELECT data.*
  FROM (
       SELECT ((e.subsidiary_id * 10001 + e.employee_id) * 1801) + gen.n AS sale_id
            , e.subsidiary_id, e.employee_id
            , DATE('now', '-' || (abs(random()) % 3650) || ' day') sale_date
            , (ABS(RANDOM())%9990)/100 AS eur_value

            , ABS(RANDOM())%25+1 product_id
            , ABS(RANDOM())%15+1 quantity
            , 'junk'
         FROM employees e
         JOIN ( SELECT generator_4k.n+1 n
                  FROM generator_4k
                 WHERE generator_4k.n < 1800
              ) gen
           ON gen.n < employee_id / 5
        WHERE employee_id % 7 = 4
       ) data
  WHERE strftime('%w', sale_date) NOT IN (0,6)
  ORDER BY sale_date;

Notes:

• The rows are inserted chronologically to reflect a natural table growth.

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