collation. (The built-in collatable data types are
text, varchar, and char.
User-defined base types can also be marked collatable, and of course
- a domain over a collatable data type is collatable.) If the
+ a domain over a
+ collatable data type is collatable.) If the
expression is a column reference, the collation of the expression is the
defined collation of the column. If the expression is a constant, the
collation is the default collation of the data type of the
Data is stored in cubes that are points (both corners are the same) using 3
coordinates representing the x, y, and z distance from the center of the
- Earth. A domain earth over cube is provided, which
+ Earth. A domain
+ earth over type cube is provided, which
includes constraint checks that the value meets these restrictions and
is reasonably close to the actual surface of the Earth.
A restriction on the values of data allowed within a
table,
or in attributes of a
-
- domain.
+ domain.
For more information, see
+
+ Domain
+
+ A user-defined data type that is based on another underlying data type.
+ It acts the same as the underlying type except for possibly restricting
+ the set of allowed values.
+
+ For more information, see .
+
+
+
+
Durability
domains
- The view domains contains all domains defined in the
+ The view domains contains all
+ domains defined in the
current database. Only those domains are shown that the current user has
access to (by way of being the owner or having some privilege).
The module also provides a data type lo, which is really just
- a domain of the oid type. This is useful for differentiating
+ a domain over
+ the oid type. This is useful for differentiating
database columns that hold large object references from those that are
OIDs of other things. You don't have to use the lo type to
use the trigger, but it may be convenient to use it to keep track of which
restriction of the current implementation: since no constraints are
associated with a composite type, the constraints shown in the table
definition do not apply to values of the composite type
- outside the table. (To work around this, create a domain over the composite
+ outside the table. (To work around this, create a
+ domain over the composite
type, and apply the desired constraints as CHECK
constraints of the domain.)