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oracle 集合

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2016-06-07 18:06:09812browse

pl/sql预定义了在varray 和嵌套表实例上进行调用的方法。这些方法能在集合上执行一定的功能。

表类型的下标不一定是连续的,所以可以删除某个下标值,数组类型不行.

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