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6 August 2014

  • 14:5514:55, 6 August 2014 diff hist +5 Selection (relational algebra) In the selection clause the not equal sign is also allowed, a reference is in " Database Sysem Concepts" byAbraham Silberschatz Yale University Henry F. Korth Lehigh University S. Sudarshan Indian Institute of Technology, Bombay in the sixth edition P.218 current