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SQL Anywhere does not support the Transact-SQL CREATE DEFAULT statement or CREATE RULE statement. The CREATE DOMAIN statement allows you to incorporate a default and a rule (called a CHECK condition) into the definition of a domain, and so provides similar functionality to the Transact-SQL CREATE DEFAULT and CREATE RULE statements.
In SQL Anywhere, a domain can have a default value and a CHECK condition associated with it, which are applied to all columns defined on that data type. You create the domain using the CREATE DOMAIN statement.
You can define default values and rules, or CHECK conditions, for individual columns using the CREATE TABLE statement or the ALTER TABLE statement.
In Adaptive Server Enterprise, the CREATE DEFAULT statement creates a named default. This default can be used as a default value for columns by binding the default to a particular column or as a default value for all columns of a domain by binding the default to the data type using the sp_bindefault system procedure. The CREATE RULE statement creates a named rule that can be used to define the domain for columns by binding the rule to a particular column or as a rule for all columns of a domain by binding the rule to the data type. A rule is bound to a data type or column using the sp_bindrule system procedure.
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