6.8.3.3 Using INTERVAL Literals in PGQL Queries

You can use INTERVAL literals in PGQL queries to add or subtract intervals to or from PGQL temporal data types respectively.

See the PGQL 1.4 Specification for the supported temporal data types.

An INTERVAL type is a period of time, which consists of the keyword "INTERVAL" followed by a numeral and a temporal unit. For example, INTERVAL '1' DAY.

The following table shows the valid temporal units that are supported in INTERVAL values:

Table 6-4 Valid values for fields in INTERVAL values

Keyword	Supported Valid Values
YEAR	Unconstrained except by <interval leading field precision>
MONTH	Months (within years) (0-11)
DAY	Unconstrained except by <interval leading field precision>
HOUR	Hours (within days) (0-23)
MINUTE	Minutes (within hours) (0-59)
SECOND	Seconds (within minutes) (0-59.999...)

The following INTERVAL operations are supported on a temporal data type:

• TEMPORAL TYPE + INTERVAL
• INTERVAL + TEMPORAL TYPE
• TEMPORAL TYPE - INTERVAL

For example, the following PGQL query retrieves persons where n.birthdate + INTERVAL '20' YEAR > TIMESTAMP '2000-01-01 00:00:00':

• JShell
• Java
• Python

opg4j> graph.queryPgql("SELECT n.name, n.birthdate FROM MATCH (n:Person) WHERE n.birthdate + INTERVAL '20' YEAR > TIMESTAMP '2000-01-01 00:00:00'").print()

graph.queryPgql("SELECT n.name, n.birthdate FROM MATCH (n:Person) WHERE n.birthdate + INTERVAL '20' YEAR > TIMESTAMP '2000-01-01 00:00:00'").print();

graph.query_pgql("SELECT n.name, n.birthdate FROM MATCH (n:Person) WHERE n.birthdate + INTERVAL '20' YEAR > TIMESTAMP '2000-01-01 00:00:00'").print()

On execution, the query output is as shown:

+--------------------------+
| name  | birthdate        |
+--------------------------+
| Mary  | 1982-09-25T00:00 |
| Alice | 1987-02-01T00:00 |
+--------------------------+