YEAR scalar function

The YEAR function returns the year part of a value.

The schema is SYSIBM.

expression: An expression that returns a value of one of the following built-in data types: DATE, TIMESTAMP, date duration, timestamp duration, or a valid character string representation of a date or timestamp that is not a CLOB. In a Unicode database, if a supplied argument is a graphic string, it is first converted to a character string before the function is executed.

The result of the function is a large integer. If the argument can be null, the result can be null; if the argument is null, the result is the null value.

The other rules depend on the data type of the argument specified:

If the argument is a DATE, TIMESTAMP, or valid string representation of a date or timestamp:
- The result is the year part of the value, which is an integer between 1 and 9999.
If the argument is a date duration or timestamp duration:
- The result is the year part of the value, which is an integer between -9999 and 9999. A nonzero result has the same sign as the argument.

Examples

Example 1: Select all the projects in the PROJECT table that are scheduled to start (PRSTDATE) and end (PRENDATE) in the same calendar year.
```
   SELECT * FROM PROJECT
     WHERE YEAR(PRSTDATE) = YEAR(PRENDATE)
```
Example 2: Select all the projects in the PROJECT table that are scheduled to take less than one year to complete.
```
   SELECT * FROM PROJECT
     WHERE YEAR(PRENDATE - PRSTDATE) < 1
```