Oracle中rownum_函數用法

原創 @夜魅 2020-03-22 13:06

對於rownum來說它是oracle系統順序分配爲從查詢返回的行的編號，返回的第一行分配的是1，第二行是2，依此類推，這個僞字段可以用於限制查詢返回的總行數，而且rownum不能以任何表的名稱作爲前綴。

(1) rownum 對於某值的查詢條件

Oracle中的rownum的是在取數據的時候產生的序號，所以想對指定排序的數據去指定的rowmun行數據就必須注意了。必須對排序使用子查詢

如果想查詢rowNum爲0-2之間的數據，如下：

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