Stored procedures and triggers can call other stored procedures. Nesting procedures lets you take advantage of existing procedures. Instead of rewriting the code, procedures can simply issue CALL statements to the existing procedures.

Another use for nesting procedures is for assembling result sets generated by queries on different databases into a single result set. With this technique, the stored procedure processes multiple SELECT statements through multiple instances of the SQLCursor class. For each of the instances, the procedure uses the DhSQLResultSet class to add rows to the result set returned by the procedure.