BC remote Oracle DBA - Call (800) 766-1884  
Oracle Consulting Oracle Training Development

Remote DBA

Remote DBA Plans  

Remote DBA Service

Remote DBA RAC

Remote DBA Oracle Home
Remote DBA Oracle Training
Remote DBA SQL Tuning Consulting
Remote DBA Oracle Tuning Consulting
Remote DBA Data Warehouse Consulting
Remote DBA Oracle Project Management
Remote DBA Oracle Security Assessment
Remote DBA Unix Consulting
Burleson Books
Burleson Articles
Burleson Web Courses
Burleson Qualifications
Oracle Links
Remote DBA Oracle Monitoring
Remote DBA Support Benefits
Remote DBA Plans & Prices
Our Automation Strategy
What We Monitor
Oracle Apps Support
Print Our Brochure
Contact Us (e-mail)
Oracle Job Opportunities
Oracle Consulting Prices





Remote DBA services

Remote DBA Support

Remote DBA RAC

Remote DBA Reasons

Remote Oracle Tuning

Remote DBA Links

Oracle DBA Support

Oracle DBA Forum

Oracle Disaster

Oracle Training

Oracle Tuning

Oracle Training

 Remote DBA SQL Server

Remote MSSQL Consulting

Oracle DBA Hosting

Oracle License Negotiation








EnterpriseDB: Composite Type

Oracle Tips by Burleson Consulting

A composite type is a User Defined Type (UDT).  There are times when you want to deal with several scalar types in a structured group.  Corresponding data types in other languages are a struct in C or a record type in PL/SQL.  In SQL, a composite type can serve as the basis for a table or for a column in a table.

A composite type is a mixture of any scalar types that you need.

We created the numeric_table in the numbers section above.  We can modify that CREATE TABLE syntax and create a composite type:

CREATE TYPE number_type AS (
  small_num NUMBER(5),
  big_num NUMBER(25),
  really_big_num NUMBER,
  number_float NUMBER(15,5),
  int_field INTEGER,
  real_float REAL,
  oid_field OID );

Notice I changed the object's name.  We already have a table named number_table so I had to name my type something else.

Once you've created this type, you can use it as a column data type or even as a parameter to a procedure or function.  Types can definitely help with simplifying your coding tasks.

If I continue with the format of my examples, I can create a table:

CREATE TABLE big_numbers (
  number_field number_type ); 

INSERT INTO big_numbers (number_field.small_num)
  VALUES (123);

Notice I chose to only insert one data element of my number_type column.  I could have inserted the entire row by using the ROW() function.

INSERT INTO big_numbers (number_field)
  ( ROW(12345, 1234567890, 12345678901234567890, 123456.1234, 1234, 109283.2364, 1283723266252533.8372326362636262632, NULL));

Now I will select some data back out:

SELECT (number_field).small_num, (number_field).double_float
  FROM big_numbers;

Here are the results from the above commands:

edb=# CREATE TYPE number_type AS (
edb(#   small_num NUMBER(5),
edb(#   big_num NUMBER(25),
edb(#   really_big_num NUMBER,
edb(#   number_float NUMBER(15,5),
edb(#   int_field INTEGER,
edb(#   real_float REAL,
edb(#   double_float DOUBLE PRECISION,
edb(#   oid_field OID );


edb=# CREATE TABLE big_numbers ( 

edb(#   number_field number_type );


edb=# INSERT INTO big_numbers (number_field.small_num)
edb-#   VALUES (123);
edb=# INSERT INTO big_numbers (number_field)
edb-#   VALUES
edb-#   ( ROW(12345, 1234567890, 12345678901234567890, 123456.1234, 1234, 109283.2364,
1283723266252533.8372326362636262632, NULL));
edb=# SELECT (number_field).small_num, (number_field).double_float
edb-#   FROM big_numbers;
 small_num |     double_float
       123 |
     12345 | 1.28372326625253e+015
(2 rows) 


This is an excerpt from the book "EnterpriseDB: The Definitive Reference" by Rampant TechPress.

Expert Remote DBA

BC is America's oldest and largest Remote DBA Oracle support provider.  Get real Remote DBA experts, call
BC Remote DBA today.



Remote DBA Service

Oracle Tuning Book


Advance SQL Tuning Book 

BC Oracle support

Oracle books by Rampant

Oracle monitoring software







BC Remote Oracle Support

Remote DBA

Remote DBA Services

Copyright © 1996 -  2013 by Burleson. All rights reserved.

Oracle® is the registered trademark of Oracle Corporation.

Hit Counter