XAML: <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft ...
在网上搜到的一种算法是利用自增长变量进行排序,然后再根据位置序号取。感觉有些复杂了,还是group_concat来的省事些 1. 按顺序聚合,逗号分隔,并计数 group_concat( number order by number asc) 2. 根据逗号拆分,判断奇偶数去截取中间位置的那个数 具 ...
分类:
数据库 时间:
2020-07-22 21:01:59
阅读次数:
111
UPDATE `test`SET `code` = ( CASE WHEN `id` = 1 THEN 11 WHEN `id` = 2 THEN 22 WHEN `id` = 3 THEN 33 END )WHERE `id` IN (1, 2, 3); ...
分类:
数据库 时间:
2020-07-21 22:17:14
阅读次数:
163
什么是垃圾 什么是垃圾( Garbage) 呢? ?垃圾是指在运行程序中没有任何指针指向的对象,这个对象就是需要被回收的垃圾。 ?外文: An object is considered garbage when it can no longer be reached from any pointer ...
分类:
其他好文 时间:
2020-07-21 22:00:23
阅读次数:
63
When “ERROR CAN NOT MAP ERROR CODE : 21” is displayed [1] Phenomenon ? “ERROR CAN NOT MAP ERROR CODE : 21” is displayed and the equipment does not ope ...
分类:
其他好文 时间:
2020-07-21 13:47:51
阅读次数:
74
How to prevent user to login second time when its already logged in. If you are using Forms Authentication, it should already be storing your Authenti ...
分类:
其他好文 时间:
2020-07-21 09:34:28
阅读次数:
78
AntsDescriptionAn army of ants walk on a horizontal pole of length l cm, each with a constant speed of 1 cm/s. When a walking ant reaches an end of th ...
分类:
其他好文 时间:
2020-07-21 01:11:57
阅读次数:
78
##题目 Pasha loves to send strictly positive integers to his friends. Pasha cares about security, therefore when he wants to send an integer n, he encry ...
分类:
其他好文 时间:
2020-07-19 23:37:51
阅读次数:
80
You appear to be running a SWT application. On macOS you must specify the -XstartOnFirstThread option when running the jar to run SWT correctly: jar - ...
在Admintool中配置时,测试连接是通的,但在directorweb页面显示是不通的状态,如下图:在MOS上查到,CannotGetDirectorToRecognizeGoldenGateInstances--EOFfromGGSCI-unexpectedendofstream.Closingconnection(DocID1568098.1)APPLIESTO:ManagementPack
分类:
Web程序 时间:
2020-07-19 11:29:07
阅读次数:
86