match the column even if you do not want to add also write single quotation marks3. When adding data, you can add to the development column.4. If the column you want to add is a self-growing column, you can give an empty string.2. Delete(1) Delete from table nameDelete from test(2) Delete from table name where conditionDelete from test where code= ' Noo2 '3. Modify the dataUpdate table name set column name = valueUpdate Test Set name = ' hui 'Update table name set column name = value WHERE cond
Common skills1. Bookmarks (Bookmarks)
Description: This is a useful feature that allows you to make a mark (bookmark) Somewhere, so that you can jump back here.
Call: Menu→navigate→bookmarks
Shortcut keys:
Add/Remove Bookmarks: F3 (OS X), F11 (Windows/linux);
Add/Remove Bookmarks (tagged): Alt + F3 (OS X), Ctrl + F11 (windows/linux);
Show all bookmarks: Cmd + F3 (OS X), Shift + F11 (windows/linux), Show all boo
[Reprint] The use of database foreign keysThe role of foreign keys:Maintain data consistency, integrity, the primary purpose is to control the data stored in the Foreign key table. Make two tables associative, and foreign keys can only refer to the values of columns in the outside!For example:A B two tablesAccount number in Table A, customer nameEach customer's order is stored in table BAfter having the foreign keyYou can only delete customer x in tab
[/*** adaptation Eclipse shortcut key * * the following man had this idea long ago * eclipseshortcutsforsublimetext2* http://icoloma.blogspot.com/2011/10/eclipse-shortcuts-for-sublime-text-2.html */{ "Keys": ["alt+/"], "command": "Auto_complete" },{ "Keys": ["ctrl+i"], "command ":" },// "Reindent" The current row and the following line interact in position { "Keys
Label:The role of foreign keys: Maintain data consistency, integrity, the primary purpose is to control the data stored in the Foreign key table. Make two tables associative, and foreign keys can only refer to the values of columns in the outside! For example: A B two tables Account number in Table A, customer name Each customer's order is stored in table B After having the foreign key You can only delete c
MAC keyboard shortcutsYou can press the key combination to perform actions that typically require a mouse, trackpad, or other input device to complete.To use a keyboard shortcut, press and hold one or more modifier keys while pressing the last key of the shortcut key. For example, to use the shortcut key command-c (copy), hold down the Command key and press the C key, and then release both keys at the same
the role of foreign keys:
Maintain data consistency, integrity, the primary purpose is to control the data stored in the Foreign key table. Causes two tables to be associated, and the foreign key can only refer to the values of the columns in the outer table.
For example:
A B two tables
Account number in Table A, customer name
Each customer's order is stored in table B
After having the foreign key
You can only delete customer x in table A when you are
Common Windows Keys
Windows Key + Space keyFeatures: transparency of all windows, Quick view of the desktop. Use this shortcut to immediately make all of the currently open windows transparent so that you can view the desktop.
Windows key + Letter Key "D"function: minimize All windows and quickly view the desktop. This set of shortcuts helps the user immediately minimize all windows on the current desktop to view the desktop, and when the s
Original post address: http://ubuntuforums.org/showthread.php? T = 617349
Author: pmdematagda November 19th, 2007
Magicsysrq keys for maintenance ance with Ubuntu troubles
This guide consists of four parts :-
1) Introduction2) restarting Ubuntu safely when it is frozen.3) Shutting Down Ubuntu safely when it is frozen.4) brief descriptions about the keys you can use in magic sysrq sequences.5) controlli
Win10 shortcut key Daquan Everyone can come to know, today Small series brought win10 commonly used shortcut keys, many friends like to use shortcut keys to operate the computer, then WINDOWS10 system what new shortcut keys?• Snap window: Win + Left/right > win + up/down > window can be changed to 1/4 size placed in 4 corners of screen• Toggle window: Alt + Tab (
Common shortcut keysShortcut KeyCTRL + Shift + spacebarCTRL +-(character) create uninterrupted charactersCTRL + B to make the characters boldCTRL + I to make the characters ItalicCTRL + u add underline for charactersCTRL + Shift + zoom out font sizeCTRL + Shift +> increase the font sizeCTRL + q Delete paragraph formatCTRL + spacebar delete character formatCTRL + C copy the selected text or objectCTRL + x cut the selected text or objectCTRL + V paste text or objectCTRL + z undo the previous opera
Guidestoring SSH encryption keys and remembering passwords has always been a daunting problem. But unfortunately, in a world full of malicious hackers and attacks, basic security precautions are essential. For many ordinary users, most people can only remember the password, they may also find a good program to store the password, as we remind these users not to use the same password on each site. But for people in every IT field, we need to raise this
10 shortcut keys for MyEclipse:Ctrl + Shift + T: Open type: Displays the Open Type dialog box to open the type in the editor. The Open Type Selection dialog box shows all the types that exist in the workspace, such as classes, interfacessuch asCtrl + Shift + R: Open resource: Opens the Open Resource dialog box to open any resource in the workspace. Without having to browse files in the package Explorer, you can quickly open anyFile. Using this shortcu
+right Arrow Displays previous page (forward key) Alt+left Arrow Displays the back page (back key) Ctrl+tab Toggle in each frame on the page (plus shift) F5 Refresh Ctrl+f5 forcibly refreshed Purpose shortcut Keys the menu bar in the activation program F10 execute the corresponding command on the menu ALT + the underlined letter on the menu closes the in a multiple-document interface program front Window Ctrl + F4 close the current
Some instructions for shortcut keys:
Ctrl=c: This key refers to the CTRL key on the PC keyboard
Alt=m: This key is the ALT key on the PC keyboard, if you do not have this key on the keyboard, you can try to use the ESC key instead
Shift=s: This key is the SHIFT key on the PC
Esc=e: This key is the ESC key on the PC keyboard, this key is usually in the upper left corner of the keyboard
Backspace=del: This key is the BACKSPACE k
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