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F_YEARSBETWEEN

• compatibility to GrUDF
• Compatible with UTF-8
• Input TIMESTAMP (older) date optionally time 1, TIMESTAMP (newer) date optionally time 2
• Output INTEGER difference in (integer) years between timestamp 1 and timestamp 2

Example

 select 2 as ISCORRECT, F_YEARSBETWEEN('01.10.2016 15:01:03', '11.10.2018 15:01:03')
 from RDB$DATABASE
 union
 select 3 as ISCORRECT, F_YEARSBETWEEN('11.10.2018 15:01:03', '01.10.2015 15:01:03')
 from RDB$DATABASE
 union
 select null as ISCORRECT, F_YEARSBETWEEN(null, null)
 from RDB$DATABASE;

Expected results:

    ISCORRECT
 ============ ============
       <null>       <null>
            2            2
            3            3

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