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# node types table structure

The node_types table holds information about the available node types in the network.

The node_type field corresponds to the node type, and it is the table’s primary key

The node_type_id field presents the identification of the node type

The description field holds the description of the node type

Attributes follow

Field | Type | NULL allowed | Default Value
--- | --- | --- | ---
node_type* | VARCHAR | NO |
node_type_id | VARCHAR | NO |
description | VARCHAR | YES |

(* - Primary key)

The SQL statement for table and index creation is below.

    CREATE TABLE  if not exists node_types (node_type     VARCHAR UNIQUE NOT NULL PRIMARY KEY,
                                            node_type_id  VARCHAR UNIQUE NOT NULL,
                                            description   VARCHAR);

    INSERT INTO 'node_types' (node_type, node_type_id, description) VALUES('default', 'y', 'Default general node type');
    INSERT INTO 'node_types' (node_type, node_type_id, description) VALUES('od', 'n', 'Origin/Desination node type');
    INSERT INTO 'node_types' (node_type, node_type_id, description) VALUES('origin', 'o', 'Origin node type');
    INSERT INTO 'node_types' (node_type, node_type_id, description) VALUES('destination', 'd', 'Desination node type');
    INSERT INTO 'node_types' (node_type, node_type_id, description) VALUES('stop', 's', 'Stop node type');
    INSERT INTO 'node_types' (node_type, node_type_id, description) VALUES('alighting', 'a', 'Alighting node type');
    INSERT INTO 'node_types' (node_type, node_type_id, description) VALUES('boarding', 'b', 'Boarding node type');
    INSERT INTO 'node_types' (node_type, node_type_id, description) VALUES('walking', 'w', 'Walking node type');

    INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('node_types','node_type', 'Node type name. E.g stop or boarding');
    INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('node_types','node_type_id', 'Single letter identifying the mode. E.g. a, for alighting');
    INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('node_types','description', 'Description of the same. E.g. Stop nodes connect ODs and walking nodes to boarding and alighting nodes via boarding and alighting links.');