|PostgreSQL Reference Manual - Volume 2 - Programming Guide|
by The PostgreSQL Global Development Group
Paperback (6"x9"), 408 pages
RRP £19.95 ($34.95)
Sales of this book support the PostgreSQL project! Get a printed copy>>>
4.2 Data Types
The columns of the information schema views use special data types that are defined in the information schema. These are defined as simple domains over ordinary built-in types. You should not use these types for work outside the information schema, but your applications must be prepared for them if they select from the information schema.
These types are:
- A nonnegative integer.
- A character string (without specific maximum length).
A character string. This type is used for SQL identifiers, the
character_datais used for any other kind of text data.
A domain over the type
timestamp with time zone
Every column in the information schema has one of these four types.
Boolean (true/false) data is represented in the information schema
by a column of type
character_data that contains
information schema was invented before the type
boolean was added to the SQL standard, so this
convention is necessary to keep the information schema backward
|ISBN 0954612035||PostgreSQL Reference Manual - Volume 2 - Programming Guide||See the print edition|