Managing Databases with Oracle
When using SQL*Plus, Oracle commands, column names, table names and all other database elements:

are case insensitive.
are case sensitive.
must always be in lower case.
must always be in upper case.

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Managing Databases with Oracle
An Oracle System Change Number (SCN):

is a value that is incremented whenever a dirty read occurs.
is incremented whenever a deadlock occurs.
is a value that is incremented whenever database changes are made.
is a value that keeps track of explicit locks.

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Managing Databases with Oracle
Which statement about sequences is not true?

Sequences guarantee valid surrogate key values.
Sequences are most often used to provide values for surrogate keys.
A sequence is an object that generates a sequential series of unique numbers.
NextVal and CurrVal are both sequence methods.

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