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What are the differences between char and varchar2 in oracle?
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If a table column has is UNIQUE and has NOT NULL, is it equivalent to a PRIMARY KEY column?
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There are n numbers of flatfile of exactly same format are placed in a folder.Can we load these flatfile's data one by one to a single relational table by a single session??
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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.
What is rowid and rownum in oracle?
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