SophiaPretty

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Category > Computer Science Posted 16 Dec 2017 My Price 7.00

inter-relation issues:a new record with a NULL value

I'm using Oracle 11g

Try the following, noting what happens and why. Store your DDL/DML commands.

  • Try adding records that cause these inter-relation issues:a new record with a NULL value for a foreign key value
  • a foreign key value in a referencing (aka child) table that doesnât match any key value in the referenced (aka parent) table
  • a key value in a referenced table with no related records in the referencing table

Try deleting/modifying records as follows:

  • Delete a referenced record that is referenced by a referencing record.
  • Delete a referencing record that references a referenced record.
  • Modify the ID of a movie record that is referenced by a casting record.

Database file below

Answers

SophiaPretty
(5)
Status NEW Posted 16 Dec 2017 12:12 PM My Price 7.00

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