Indexes
This section describes the SDL declarations pertaining to indexes.
Example
Declare an index for a “User” based on the “name” property:
type User {
required property name -> str;
property address -> str;
multi link friends -> User;
# define an index for User based on name
index on (.name) {
annotation title := 'User name index';
}
}
Syntax
Define a new index corresponding to the more explicit DDL commands.
index on ( index-expr )
[ except ( except-expr ) ]
[ "{" annotation-declarations "}" ] ;
Description
This declaration defines a new index with the following options:
on ( index-expr )
The specific expression for which the index is made. Note also that <index-expr>
itself has to be parenthesized.
except ( exception-expr )
An optional expression defining a condition to create exceptions
to the index. If
<exception-expr>
evaluates totrue
, the object is omitted from the index. If it evaluates tofalse
or{}
, it appears in the index.
The valid SDL sub-declarations are listed below:
annotation-declarations
Set index annotation to a given value.
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See also |