Firebird Documentation IndexFirebird 2.0 Language Ref. Update → External functions (UDFs)
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Chapter 12: External functions (UDFs)

Table of Contents

addDay
addHour
addMilliSecond
addMinute
addMonth
addSecond
addWeek
addYear
ascii_char
dow
dpower
getExactTimestamp
i64round
i64truncate
log
lower
lpad
ltrim
*nullif
*nvl
rand
right
round, i64round
rpad
rtrim
sdow
srand
sright
string2blob
strlen
substr
substrlen
truncate, i64truncate

External functions must be “declared” (made known) to the database before they can be used. Firebird ships with two external function libraries:

Users can also create their own UDF libraries or acquire them from third parties.

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Firebird Documentation IndexFirebird 2.0 Language Ref. Update → External functions (UDFs)