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Ask for a basic MySQL problem.:( PHP) copy a record with ID A into the same table, generate a new record, modify the values of some fields in the process, how to write?

One SQL master table record corresponds to multiple record statements in the attached table In this case, we will use Union statement SQL union syntax Select column_name (s) from table_name1 Union Select column_name (s) from table_name2 Join left statement Left join keyword syntax Select column_name (s) From table_name1 Left join table_name2 On table_name1.column_name = table_name2.column_name

Write a trigger. Delete a record from tb_control and automatically add the record to tb_ctrlhistor in another table. Create Trigger Save_history On Tb_control For Delete As If @ Rowcount > 0 Begin Insert Tb_ctrlhistor Select Column_name_1, column_name_12 From Deleted End Write an SQL statement that can be executed in the query analyzer.Write

Delete the same data (only one record is left) across the oracle network and one record from oracle Delete from reg_user t1 WHERE user_name = '2013' and rowid> (SELECT min (rowid) FROM location t2 WHERE t1.user _ name = t2.user _ name ); How to use an SQL statement in Oracle to delete duplicate data (leave a piece of data) Delete Emp pWhere rowid in(Select tmpid(Select ROW_NUMBER () OVER (partition by

Record the troubleshooting and resolution of a deadlock, and record the troubleshootingThis is a sad reminder. I remember last week's busy schedule. The goal is to modify some bugs in the code left by another team. This project is used for OLAP analysis, the Logic Server is mainly responsible for metadata operations, such as information displayed on the page, and the Analysis Server is responsible for execu

Android WiFi usage record and androidwifi record Recently, I am working on the development of WiFi for Android. The Connection Tool class refers to the tool class in this article. Http://www.cnblogs.com/zhuqiang/p/3566686.html Some problems encountered during development are recorded here for some solutions. 1. Identification of Wi-Fi encryption methods String capabilities = scanResult.capabilities; If (ca

Linux Learning Record 5 (software installation and upgrade) and linux record I. gcc Gcc is the most standard C language compiler on Linux, used for source code compilation links.Gcc-c hello. c compilation generates the target file hello. ogcc-O hello. c compilation generates the target file and optimizes gcc-o hello. c generates the executable binary file hello. disadvantage: Command redundancy. If a C-lang

Linux environment deployment record (2): linux environment deployment record NFS file sharing service Assume that the existing two Server IP addresses are 192.168.0.2 and 192.168.0.3, 192.168.0.2 as the Server, and 192.168.0.3 as the Client, then: Nfs-utils rpcbind must be installed on both machines: yum -y install nfs-utils rpcbindchkconfig nfs onchkconfig rpcbind on Enable Firewall ports 111 and 2049:

Record some recently used commands, record usage commands (Command to paint in green) View the device USB command:Ls/dev/ttyUSB * The serial number of the device first inserted into the PC is small, for example, the OpenJTAG device and USB to serial port device are successively inserted. They are ttyUSB0 and ttyUSB1 respectively. Logon telnet command:Telnet local host 4444 Ln command: This command

[Record] install caffe on MAC and record maccaffe --- Restore content start --- Recently tried MAC (OS X 10.11 El Capitan) I encountered some problems when installing Caffe and Python interfaces, but I did not find a solution to these problems in the official installation tutorial. I searched for a long time (mainly on the Python Interface) and finally found a solution. In fact, Caffe's installation involve

Simple test record and linuxelk test record for installing elk in Linux Version: 1. elasticsearch-5.6.4.tar.gz 2. jdk-8u131-linux-x64.rpm 3.kibana-5.2.0-linux-x86_64.tar.gz 4.logstash-5.6.3.tar.gz Next we need to have a virtual machine, and then enter the command yum install lrzsz (I used xshell to connect to the Linux virtual machine) We pull these packages in, And then uninstall the jdk and command in Lin

Many times we are faced with the following requirements: After a record is inserted into a table, the ID of the record is immediately required (ID is the auto-increment identifier ). According to the conventional thinking, the SELECT statement is executed immediately after the insert statement is executed, but this is risky. If the conditions are not fully considered during the SELECT statement, the result

MySQL Tutorial group BY, sort the largest record of time in each record Select A.* from Test A,(Select Aid, Max (day) Max_day from test Group by aid) bwhere A.aid = B.aid and A.day = B.max_dayORDER BY A.install Desc Here is the test table, which tests the SQL CREATE table if not EXISTS ' test ' (' ID ' int (a) unsigned NOT NULL auto_increment,' Install ' int (a) unsigned NOT NULL,' Day ' int (a) unsigned

|+------------------+----------------------+|general_log |ON | | general_log_file|/tmp/kkmail_mysql.log|+------------------+----------------------+2rowsinset (0.00sec) mysql>setglobalgeneral_log=off; queryok,0rowsaffected (0.00sec) mysql>showglobal variableslike '%general% '; +------------------+----------------------+|variable_name |Value |+------------------+----------------------+|general_log |OFF | | general_log_file|/tmp/kkmail_mysql.log|+------------------+----------------------+2 rowsins

Python Learning Record and python recordTerminal auto-completion. Note that you need to install the readline module> import OS> import rlcompleter, readline> readline, parse_and_bind ('tab: complete') to determine the data type (): Determine the Data Type isinstance (): Common operators used to determine the Data Type: +-*/% ** //

1. Read the last row of the file. Of course, this method is faster than the following one. Randomaccessfile Rf = NULL; 2. Read the last record of the file String string2 = NULL; 3. append records at the end of the file Try { 4. append records at the end of the file Try {

As shown in the following table: The code is as follows Copy Code CREATE TABLE ' T1 ' (' UserID ' INT (one) DEFAULT NULL,' Atime ' datetime DEFAULT NULL,KEY ' Idx_userid ' (' userid ')) Engine=innodb DEFAULT Charset=utf8; The data are as follows: The code is as follows Copy Code Mysql> SELECT * from T1;+--------+---------------------+| UserID | Atime |+--------+---------------------+| 1 | 2013-08-12 11:05:25 || 2 | 2013-08-12 11

1. Install a "Shield smart phone data recovery software" Software on the computer we download the trial version do not download the fee 2. Then connect the cell phone with the computer, if it is an Android phone to use root authority (recommended reading: The mobile phone to get root permissions method) The iphone operation is a bit complicated we need to do data recovery before we need to use the itunes backup phone to delete data after the state. 3. Open the software, we can choose a rec

At the company project today, I connect Oracle with hibernate. When you list all the records for a table, you find a record that repeats. and directly with the JDBC connection, you can correctly listed. I thought JDBC was unstable, and I was startled. After all, intend to use it as a long-term database AH ~ ~ The primary key ID for the exact duplicate data was repeated (or, when the JDBC set up the table, there was no primary key, because it w

How does the https://www.dnspod.cn Add a record? 1. Under what circumstances will a record be used? [If you want to direct a domain name to an IP address, you need to add a record] 2. How to add a recordA. enter a subdomain name in the Host record (for example, to add www.123.com resolution, you only need to enter WWW