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最新文章列表
oracle去除重复数据常用的方法
SELECT * from ecm_query t
where t.rowid in (
select rid
from (select t1.rowid rid,
row_number() over(partition by t1.id, t1.name order by 1) ...
用elasticsearch聚合函数实现distinct查询
1.等价的sql
SELECT DISTINCT field1,field2 FROM test_index.test_type
等价于
SELECT field1,field2 FROM test_index.test_type GROUP BY field1,field2
2.而group by的查询,在es中我们可以用Aggregation(聚合)去实现,等价的DSL查询语 ...
JavaScript数组删除重复项
“如果你一直在乎别人的看法,你就毁了。” ——《荒蛮故事》。
看了realazy的《JavaScript 数组的uniq方法》,提供了几个删除数组条目中重复的条目的Array原型方法,我也给出我的新解:
1、Realazy的写法
Array.prototype.uniq = function() {
var resultArr = [],
retur ...
JS的四种数组去重方式
今天去面试,其他有这么一道题,给出一个js数组,然后把数组中重复的元素去掉。当时没怎么想到好方法,就直接用的循环套循环的方式做的,现在网上搜了一下,发现还有更好的方式,总共整理了四种:
function getArray(){
var arr = [];
for(var i = 0; i < 10000; i++){
arr[i] = (Math.random() ...
Remove Duplicates from Sorted List II
Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.
For example,
Given 1->2->3->3->4->4->5, return 1->2 ...
Remove Duplicates from Sorted Array
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.
Do not allocate extra space for another array, you must do this in place with co ...
maven jar 包 自动统一去重升级
package java2015.java09.javatest;
import java.io.File;
import java.io.ObjectInputStream.GetField;
import java.util.HashMap;
import java.util.Map;
public class Test {
f ...
hive having count 不能去重
hive在使用having count()是,不支持去重计数
hive (default)> select username from t_test_phonenum where ds=20150701 group by username having count(distinct sex)>1 limit 10;
FAILED: SemanticException [E ...
java 常用方法
java 常用方法:
(1)去掉所有的回车换行
/**
* delete CRLF; delete empty line ;delete blank lines
*
* @param input
* @return
*/
public static String deleteCRLF(String input) {
input = SystemHWUt ...