Oracle/SQL Tutorial - Emory University
Null value: is [not] null, i.e., for a tuple to be selected there must (not) exist a de ned value for this column. Example: select from EMPwhere MGRis not null; Note: the operations = null and ! = null are not de ned! Domain conditions: [not] between and Example: select EMPNO, ENAME, SALfrom EMP ................
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