This allows me to insert data for specified fields and not for other fields in the structure.

Updating the data in a table.

This is the command to delete a record from the table.

The alter is used to alter the structure of the table by adding fields, modifying fields and dropping fields.

literal dog. Now we are starting to look at the built in functions within Oracle.

that I want to see.

Substr extracts data from within a field.

You can use instr to find something like the / and substr to extract part of a field.