further explained:
We need to modify the following SC table foreign key Declaration, add the name of the foreign key constraint, to facilitate our subsequent masking and recovery of foreign KEY constraints:
create table SC (s# integer , C # integer , Scor E integer , constraint sidfk foreign key (
number)Insert into table values (serial number as ID, other columns);EndProgram code Con.commit ();Serial Number Stored procedure:Update tab Statistics Field +1Update tab Final serial number set type + Month Day + complement 0 bit + statistic fieldSelect final serial number;//as Primary key-----------------------------------------------------------------But where does the problem occur, since it is a primary key
When you use a view for querying, you often use the method of combining the primary key.
In Hibernate, a field that is configured in a combined primary key, if one of the values is NULL, hibernate sets the corresponding entity for the entire row to null.
Sometimes, it's not what we want.
The most likely solution on the web is to place a potentially null field ou
Solution to the problem of the white chrome logon key ring and the garbled characters entered by sogou pinyin (Security trial version) and the chrome key
This is two recent problems.
Chrome logon key ring Solution
In linux, the key
This error occurs because when you add a new key on GitHub, the ~/.ssh/id_rsa.pub content is copied incorrectly. Generally occurs under Linux, because Windows uses notepa++ to open this file and copy is generally not a problem, and Linux under the use of Vim to open and copy will be added to vim because of the addition of the key to add failure. The workaround is to use the cat command to output the. ssh/id
$a = 3.5;$arr = Array ("1" =>4, "2.5" =>5, "5" =>6);//decimal key name, need to quote$arr = Array_flip ($arr);foreach ($arr as $key = = $value) {$b [] = $value;}The main idea is to flip the array, take out the original array of all the key names to form a one-dimensional array, determine in which ladder range, and then reverse the array to array_search out the co
"compatible" to "nocompatible" non-compatible mode solves the problem of the direction key becoming ABCD. The next problem to solve the backspace key is also very simple, in the sentence after just add a sentence:
Set backspace=2
becomes as shown:Hint: There is no space on either side of the equals sign in set backspace=2 herecan solve the problem. This time, regardless of which user, the use
After this installation, we still use the "VI" command to start the newly installed VIM when editing the file, but it is more convenient to operate than the tiny.Third, add ". VIMRC" FileIt's not a clever way. It is in the user's personal directory, edit the. vimrc file (Note that the file name is ".") ), add the following two sentences:
Set nocompatible //working in non-compatible mode
Set backspace=2
As shown in the following:After saving the exit, the user will be abl
Solution for failure of all certificates in the iOS-key string (invalid issuer of the certificate), ios-Key
Today, I used Xcode to package the IPA file to my colleagues. When the result showed that the import was prompted, I was prompted for the certificate missing. After finding the file for a long time, I did not find any problem. Then I opened the
Android activation key failure to start the mobile phone solution, android SolutionProblem description
The Android phone's key is damaged and cannot be started.
Solution
Connect your mobile phone to your computer through USB cable, go to the command line, find the directory where the adb command is located, an
:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager
On a server running Windows 2000 with SP 4, this registry key is located under the following registry subkey:
Hkey_local_machine\system\control\session Manager
Note If the SafeDllSearchMode registry key does not exist, create the SafeDllSearchMode registry key as a DWORD value.
4. In the Value
Tags: share pictures block example appears a table name term error-OThere are two ways to create a primary key:
CREATE TABLE Table name (Field Name Type,Field Name Type,......Primary key (name));
or a
CREATE TABLE Table name (Field Name Type primary key,Field Name Type,......);
However, it is important to note that
When compiling OpenWrt source code, make V=s prompts OpenWrt to appear signing key has not been solution
The compilation appears as follows:
Generating index for package./UHTTPD_2014-10-27-FD8E5E379C23C5FBCEC3E76894B839233DF09067_RAMIPS_24KEC.IPK
Generating index for package./WATCHDOG_1_RAMIPS_24KEC.IPK
Generating index for package./WIRELESS-TOOLS_29-5_RAMIPS_24KEC.IPK
Signing
Label:When using Xshell to connect to the Linux server, switch to the Sqlplus console, when using the return, the ^h symbol appears, it seems that the return can not be used! Solution:1) $ stty erase ^h: The setting associated with the BACKSPACE key is erase, which represents the deletion of the last character.If the current window is executed, only the current window is valid, the next time you log in will
A lot of people in the use of white clouds after a key to reload the system appeared 10010 wrong problem, we are helpless, this time we do not need to hurry, the following small series to teach us Baiyun a key to reload the system after the 10010 error solution .
The reason for this error is simple, after using some sort of one-click Restore Wizard o
1. First this error in Baidu translation above query, what is the meaning of the query results are as follows:Failed to open key database file. c;\ user \ w \ platform \ securecrt_fx6.5.3 \ \ \ \ hostsmap.txt knowhosts Configuration2. Then Failed it to open the key database file. C;\\user\\w\\destop\\securecrt_fx6.5.3\\config\\knowhosts\\hostsmap.txt this error in Baidu above query,
Tags: install. com regedit ref run Mac DLL chmod logHow does SQL Server 2000 skip Cd-key during the installation process? Solutions from the cloud network are as follows:1. Run "regedit" to open the registry.2. Locate the registry branch HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager.3. Change the key value of the SafeDllSearchMode DWORD to 0, and if not, create the
Reason: Content Assist shortcut keys, this means that the contents of assistance, that is, we are accustomed to the prompt function, the default shortcut is Ctrl+space this and we in Windows to change the keyboard shortcut key conflicts.1. Select window->preferences; in the MyEclipse6.5 menu bar2. Select general->keys;3. In the middle right form, click Word Completion and then click Remove Binding to enter a shortcut
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