November 2015
Beginner
464 pages
9h 46m
English
Content preview from Learning PostgreSQLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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PostgreSQL user-defined data types
PostgreSQL provides two methods for implementing user-defined data types through the following commands:
- CREATE DOMAIN: The
CREATE DOMAINcommand allows developers to create a user-defined data type with constraints. This helps in making the source code more modular. - CREATE TYPE: The
CREATE TYPEcommand is often used to create a composite type, which is useful in procedural languages, and is used as the return data type. Also, one can use the create type to create theENUMtype, which is useful in decreasing the number of joins, specifically for lookup tables.
Often, developers tend not to use the user-defined data types, and use flat tables instead due to a lack of support on the driver side, such as JDBC and ODBC. ...
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