Remove duplicate data by day. If the value is 0, 0 is used. Otherwise, the maximum value is used. If the value is 0
Test data: mysql> select * from t2; + ---- + -------- + --------------------- + ---------- + | id | userid | inputDate | infoStatus |
Author: idleTime:Blog: blog.csdn.net/cg_ IEmail: B _dx@sohu.comReference books: programmer's mathematics
What is the power 0 of 10?Reference:In the 10-digit explanation, we have mentioned that "1 is 100 (10 to the power of 0)", that is, 100 = 1.I
Reprint to: http://beikeit.com/post-495.html simple translation: This Linux official information mainly describes the external fragments (external fragmentation), internal fragments (internal Fragmentation) concept and the related situation, it
Conventions:1) in the following test questions, all the necessary header files have been correctly included2) Data TypeChar 1 byteInt two bytes 2 bytes (16-bit system, think integer is 2 bytes)Long int, four bytes, 4 bytesFloat four bytes 4
Package com.cn;Import java.util.ArrayList;Import java.util.Collections;Import Java.util.Comparator;Import Java.util.HashMap;Import java.util.List;Import Java.util.Map;Import Java.util.Map.Entry;Import Java.util.Random;/*** Created by Sam on 2017/1/9.
/* (Start of program header annotation)* Copyright and version Declaration of the program* Copyright (c) 2011, a student from the computer College of Yantai University* All rights reserved.* File name: enter 10 to store the data in the array, and
Bytes ---------------------------------------------------------------------------------------------------------------------------
Statement:
As this post is reposted in large quantities, I have not found the original translator, so I will not list
0x10 basic issues that embedded programmers should know
C language testing is an essential and effective way to recruit embedded system programmers. Over the years, I have both participated in and organized many such tests. During this process, I
C language testing is an essential and effective way to recruit embedded system programmers. Over the years, I have both participated in and organized many such tests. During this process, I realized that these tests could provide a lot of useful
C language testing is an essential and effective way to recruit embedded system programmers. Over the years, I have both participated in and organized many such tests. During this process, I realized that these tests could provide a lot of useful
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