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12逻辑运算符两侧运算对象的数据类型是______
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SQL支持集合的并运算,运算符是________
在下列关系代数的操作中,_________属于传统的集合运算。
设∪表示集合的并运算,∩表示集合的交运算,A表示集合A的绝对补,A-B表示集合A与B的差,则A-B=______ 。
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