UDF also called user defined function. The create function statement creates a user-defined function. You can write it in C, PL1, Cobol, Assembler, etc.
User defined function in SQL
Here is a Table function, which created a Table ‘DOCMTCH’
CREATE FUNCTION DOCMATCH (VARCHAR(30), VARCHAR(255))
RETURNS TABLE (DOC_ID CHAR(16), DOC_ABSTRACT VARCHAR(5000))
EXTERNAL NAME 'DOCMTCH'
LANGUAGE COBOL
PARAMETER STYLE SQL
READS SQL DATA
DETERMINISTIC
NO EXTERNAL ACTION
FENCED
SCRATCHPAD
FINAL CALL
DISALLOW PARALLEL
CARDINALITY 20;
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