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functions

functions

functions

(OP)
Can we define new functions ( similar to built-in , for example - trim ) for use in select statement.

If so can I have an example.

Thanks in advance
Sri

RE: functions

Sri:

You can create stored procedures and call them from SQL:

Here's a sample stored procedure:

-- This procedure returns the number of seconds between datetime dt1 and dt2.
-- change to character first because the interval to integer conversion
-- fails.  Ed Schaefer 09/23/98
CREATE PROCEDURE int_in_sec(dt1 DATETIME YEAR TO SECOND, dt2 DATETIME YEAR
TO SECOND) RETURNING INTEGER;
DEFINE int_sec INTERVAL SECOND(9) TO SECOND;
DEFINE xchar CHAR(20);
DEFINE xint INTEGER;

LET int_sec = dt2 - dt1;  -- get the interval
LET xchar = int_sec; -- change to char
LET xint = xchar; -- change to integer

RETURN xint;
END PROCEDURE;

Here's a sample table:

create table sample_table
  (
    dt1 datetime year to second,
    dt2 datetime year to second
  );


with sample data:

insert into sample_table values ("2002-02-28 16:00:23", "2002-02-28 17:00:24")

and with the sample select:

select int_in_sec(dt1, dt2) from sample_table

returns the value: 3601

Regards,

Ed
Schaefer



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