Omnidex Queries are typically specified using an Omnidex SQL SELECT statement.

Distinct can be applied to an entire select-item list or used within an aggregate function.

SELECT DISTINCT city, state FROM prospects

SELECT count(DISTINCT zip_code) FROM prospects

Result set limiters limit the rows returned by the select statement. The result set limiter processing is done AFTER the query has completed.

TOP n, EVERY n, RANDOM n

SELECT TOP 10 company FROM prospects

SELECT EVERY 20 company FROM prospects

SELECT RANDOM 10 company FROM prospects

These result set limiters do not order returned data in any way. Ordering is set by the ORDER BY clause.

Column names from one or more tables.

SELECT company, contact, phone FROM customers

SELECT company, contact, order_date FROM customers, orders ...

An alias containing a space or special character must be quoted. Single or double quotes.

The AS keyword is optional.

SELECT company CO, contact 'Contact Name', phone "Phone Number" FROM ...

SELECT contact AS 'Contact Name', phone AS 'Phone #' FROM ...

SELECT customers.company, customers.contact, orders.order_date
  FROM customers, orders ...

SELECT A.company, A.contact, B.order_date FROM company A, orders B ...

min() max() avg() sum() count() count(*)

SELECT customer_no, min(amount), max(amount), avg(amount)
  FROM orders GROUP BY customer_no

SELECT company, sum(amount) FROM ...

SELECT count(*), count(state) FROM ...

These functions can be used on literals or columns.

CASE
CAST
CHARACTER_LENGTH | CHAR_LENGTH
Concatenation using ||
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
CURRENT_USER
EXTRACT
LOWER
POSITION
SESSION_USER
SUBSTRING
SYSTEM_USER
TRIM
UPPER
USER

SELECT upper(company), upper(contact), current_date FROM ...

SELECT position('SYS' IN 'DYNAMIC INFORMATION SYSTEMS'), system_user FROM ...

Extended Functions

These functions can be used on literals or columns

SELECT $proper(company), $random(3) FROM ...

SELECT $soundex('database') FROM ...

SELECT 'Company Name: ', company, 'Contact Name: ', contact FROM ...

SELECT order_number, 'Discount: ', (quantity * amount)*.02 FROM ...

$ROWID returns the internal rowid. This is either the native rowid or the redefined rowid.

$ODXID is the Omnidex ID from the Omnidex indexes.

SELECT $ROWID, $ODXID, Company FROM ...

SELECT * FROM CUSTOMERS ...

SELECT c.*, o.* FROM CUSTOMERS c, ORDERS o ...

SELECT STATE, DESCRIPTION,
  (SELECT SUM(TOTAL) FROM ORDERS WHERE TAX_STATE='CO')
  FROM STATES WHERE STATE='CO'

The FROM clause allows the following retrieval types and join operations:

• Single Table
• Multiple Tables (Joins)
• Inner Joins - Join occurs in the where clause
• Outer Joins - Left Outer Join, Right Outer Join
• Nested Selects

SELECT * FROM CUSTOMERS

Join columns must have matching data types and lengths.

SELECT company, order_number FROM CUSTOMERS, ORDERS ...

Tables are joined in the WHERE clause. The join predicate is 'AND'ed to other WHERE criteria predicates.

SELECT company, order_number, status FROM customers, orders WHERE
   customers.customer_no = orders.customer_no AND orders.status='CANCELED'

Outer joins prevent the exclusion of records in one table that do not have records in the joined table.

SELECT company, order_number, status FROM customers c LEFT JOIN orders o ON
       c.customer_no = o.customer_no

SELECT company, order_number, status FROM customers c LEFT OUTER JOIN
       orders o ON c.customer_no = o.customer_no

SELECT company, order_number, status FROM customers c RIGHT JOIN orders o ON
       c.customer_no = o.customer_no

SELECT company, order_number, status FROM customers c RIGHT OUTER JOIN
       orders o ON c.customer_no = o.customer_no

select company, contact, state from customers c,
       (select distinct customer_no from orders where status='back') AS o
       where c.customer_no = o.customer_no and state!='co'

© Copyright Dynamic Information Systems - This document was last updated July 15, 2009.