我得到了下面的代码: int nnames;
String names[];
System.out.print("How many names are you going to save: ");
Scanner in = new Scanner(System.in);
nnames = in.nextInt();
names = new St
我得到了下面的代码: int nnames;
String names[];
System.out.print("How many names are you going to save: ");
Scanner in = new Scanner(System.in);
nnames = in.nextInt();
names = new String[nnames];
for (
我有一个表格,有一些重复的行,我想正常化成2个表格。 user | url | keyword
-----|-----|--------
fred | foo | kw1
fred | bar | kw1
sam | blah| kw2
我想通过将其标准化为两个表(user和url_keyword)开始。是否有可以运行的查询来规范化,还是我需要通过脚本循环遍历表来构建表?
好子查询的所有结果,所以如果你想一回的故事,看我previous question 搞清楚其中我的记录是不是重复是很容易的: SELECT *
FROM eventlog
GROUP BY event_date, user
HAVING COUNT(*) = 1
ORDER BY event_date, user
这将返回所有非重复项。所以我想我会将它们移动到另一个名为“no_dupl