oracle dual
时间: 2023-10-19 22:31:50 浏览: 105
在Oracle中,dual是一个实际存在的表,任何用户都可以读取。它是Oracle提供的最小的工作表,只有一行一列,具有特殊的作用。在Oracle中,语法规则非常严格,需要使用虚拟表dual来构成语法规则。例如,如果想要获取当前日期,在Mysql中可以使用函数`now()`,而在Oracle中需要使用`select sysdate from dual;`来获取。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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