What is the usage of merge statement?
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Using the relations and the rules set out in the notes under each relation, write table create statements for the relations EMPLOYEE, FIRE and DESPATCH. You should aim to provide each constraint with a formal name, for example table_column_pk.
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Using the relations and the rules set out in the notes under each relation, write statements to create the two sequence generators specified in the notes.
Please explain joins in oracle?