嵌套循环（Nested Loops （NL））假如有A、B两张表进行嵌套循环连接，那么Oracle会首先从A表中提取一条记录，然后去B表中查找相应的匹配记录，如果有的话，就把该条记录的信息推到等待返回的结果集中，然后再去从A表中提取第二条记录，去在B表中找第二条匹配的记录，如果符合就推到返回的结果集...
求翻译:WORKING WITH NESTED LOOPS是什么意思?待解决 悬赏分:1 - 离问题结束还有 WORKING WITH NESTED LOOPS问题补充:匿名 2013-05-23 12:21:38 与嵌套循环工作 匿名 2013-05-23 12:23:18 与嵌套循环一起使用 匿名 2013-05-23 12:24:58 与嵌套循环一起使用 匿名 2013-05-23 12:26:38 正...
Nested Loops is used to find matched rows from A table(normally full scan or index range scan) to index scan B table. There is no definite answer which is better, since normally it cannot replace each other unless you rewrite your SQL in significant differently syntax.
求翻译:This example uses nested loops (loops in loops), i.e. one outer loop that iterates through the channels loop and one inner loop that iterates through the answers in the programs loop. We have used the labels Inner and Outer in the script to make sure that it is the iteration ...
Nested Loops is used to find matched rows from A table(normally full scan or index range scan) to index scan B table. There is no definite answer which is better, since normally it cannot replace each other unless you rewrite your SQL in significant differently syntax.
求翻译:the control system consisits of two loops nested withen one another. the primary controller(level controller)processes the level error and calculates a charging flow set point on the basis of the letdown flow rate. the secondary controller(flow controller)controls the chemical and volume co...
求翻译:the control system consisits of two loops nested withen one another. the primary controller(level controller)processes the level error and calculates a charging flow set point on the basis of the letdown flow rate. the secondary controller(flow controller)controls the chemical and volume co...