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
Ask for a basic mysql question. (in PHP) copy a record with id a to the same table and generate a new record. in this process, modify the values of some fields. how can this problem be written? This is the case: when a user copies a published item and then releases it, only the content that may be modified is submitted, other content is directly obtained from the database based on the copied
I got a record set row. how can I read all the record sets to form a two-dimensional array. This post was last edited by qq914260102 from 2013-11-1410: 08: 13. for example, there are one hundred records in my record set $ row nbsp. For ($ k0; $ k lt; $100; $ k ++) {$ arrarray ($ a [$ k], $ B [$ k], $ c [$ k]); pr I got a re
[Improvement] Use Log4net to create a log record and log4net to create a log record
In the previous article, only common file reads and writes are used for log writing. As many friends have said, frequent file reads and writes may cause many problems, the code lacks boundary control and operation control, and does not manage resources. It is a typical bad code.
As mentioned by our predecessors, Log4net is u
The only way to record the sound of the microphone can not record playback content of the solutionSome use the free to replace the background music speech synthesis Tool user response, can not record playback content, now the solution is described as follows (for example, XP system):1. Double-click the small horn icon in the lower right corner of your computer:
Apache Shiro learning record 4 and apacheshiro record 4
I read the third chapter of the tutorial today... it's about authorization ...... as before ..... I also studied it myself .... I think how to read the tutorial ..... in general, there are a few excellent tutorials .... however, in some cases, it is too little .... and these places are quite difficult .. for example, section 3.5 Authorizer, PermissionR
Bootstrap record 1: bootstrap record
I have to learn about bootstrap at work. Although I have learned a little before, I have never studied it in depth. Now I have the opportunity to get familiar with bootstrap and record my bootstrap learning journey through my blog, now .. (Here we will record the problems I found a
Users of QQ software to the detailed interpretation of the sharing of the QQ chat record deleted graphics and text tutorial.
Tutorial Sharing:
Method One: System settings Delete
1, first login to their QQ account, and then click the window below the Open Message Manager button
2, open the Message manager, select the friend you want to delete the chat record, sele
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