Oracle/SQL Tutorial - Emory University
Logical Database Structures 60 6.3. Physical Database Structures 61 6.4. Steps in Processing an SQL Statement 63 ... it may have the special value null (for unknown). This value is di erent from the number 0, and it is also di erent ... where SALbetween 1500 and 2500; select ENAMEfrom EMP where HIREDATEbetween ’02-APR-81’ and ’08-SEP-81’;
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