How to split comma separated string inside stored procedure?

Question

How to split comma separated string into strings inside store procedure and insert them into a table field?

Using Firebird 2.5

Answer 1

Use POSITION http://www.firebirdsql.org/refdocs/langrefupd21-intfunc-position.html

and

SUSTRING http://www.firebirdsql.org/refdocs/langrefupd21-intfunc-substring.html

functions in WHILE DO statement