ivs in keys

Differences Between Auto-incrementing primary keys of mysql Storage types and primary keys of mysql Storage Q: if there is a table with an auto-increment primary key whose field is id, after 10 data entries have been inserted into the table, the data with id and 10 has been deleted, restart mysql and insert a data record. What is the id of the data record, which is 8 or 11?A: If the table type is MyISAM, i

In the GIT management process, do not want to enter the user name and password every time, the solution is as follows;1. The link is replaced by the SSH protocol.2. Add the SSH public key to the GIT server.Open Gitbash1) Enter the command ssh-keygen-t rsa-c "XXXX" and then press ENTER, double quotation marks in the mailbox or username to change their own;2) Double Press 3 times Enter3) Copy the contents of id_rsa.pub (this file in the personal directory under the SSH folder) into the GIT server

Vim shortcut keys and vim common shortcut keys # Vim filename : Scriptname// View scripts loaded by vim : Set nu// Set the row number : Set tabstop = 4// Set a tab to 4 spaces : Set ai// Set Automatic indent Space key// Move one cell to the right X// Delete the subsequent characters (in command mode) X// Delete the first character. Delete the three characters to 3x. Dd// Delete a row D// Delete to the end o

Complete vim shortcut keys and complete vim shortcut keys I have been studying for a long time in Linux, but I am still a primary school student. Alas, I shared the vim commands in linux, with these shortcuts, I believe everyone will be able to learn in linux. I. move the cursor1. Shift left h, move right l, move down j, move up k2. Flip down ctrl + f, flip up ctrl + B3. Flip down half page ctrl + d, flip u

Android ring menu (processed menu keys and return keys + added animations) Not much nonsense. first look at it: Package com. example. circlemenuofbottom. anim; import android. view. animation. rotateAnimation; import android. widget. relativeLayout;/*** @ author lzd *** QQ: 2622596982 *** email: www.bkjia.com ** QQ chat group: 277599214 */public class MyAnimationUtils {/*** exit animation --- cloc

Database Operations change primary keys, insert loops, and database primary keys-- Alter table HistoryData drop constraint PK_HistoryData -- delete the primary keyAlter table HistoryData add constraint PK_HistoryData primary key (CollectionTime, Code) -- change the primary keyDelete from HistoryData where CollectionTime between '2017-09-01 00:00:00 'and '2017-11-01 00:00:00' and ID not in (Select id from (S

Shift+ctrl+t: New tab pageSHIFT+CTRL+W: Close tabCtrl+pageup: Previous tabCtrl+pagedown: Next tabShift+ctrl+pageup: Tab Shift leftShift+ctrl+pagedown: Tabs Move RightALT+1: Switch to tab page 1ALT+2: Switch to tab page 2ALT+3: Switch to tab page 3Shift+ctrl+n: New WindowSHIFT+CTRL+Q: Closing the terminalCopy/paste in terminal:Shift+ctrl+c: CopyShift+ctrl+v: PastingTerminal change Size:F11: FullscreenCtrl+plus: Zoom InCtrl+minus: DecreaseCtrl+0: Original SizeLinux terminal shortcut

index-based update operation, although MyISAM may be inferior innodb, but so high concurrency of write, from the library can chase is also a problem, It might as well be solved by a multi-instance sub-Library table architecture.7, if it is used MyISAM, the merge engine can greatly speed up the development of the application department, they just do some select count (*) operation on this merge table, it is very suitable for a large project total of about hundreds of millions of rows of a type (

JS obtains the key value of the left and right mouse keys. js obtains the left and right keys. Function test () {alert (event. x + "" + event. y); alert (event. button);}/* The right-click menu does not display */document. oncontextmenu = function () {return false;}/* document. onmousedown = function () {if (event. button = 1) {alert ("left")} if (event. button = 2) {alert ("right")} */document. onkeydown =

One, multi-line Comment shortcut keys1. Select the area you want to annotate, use ctrl+shift+c or ctrl+/ to add//comment2. Select the item you want to annotate, and use shit+ctrl+/ to add */*/comment3. The above shortcut will be removed by repeating the comment4. To modify the shortcut key for a command in Eclispe we just have to go to the key settings, Windows-preferenceSecond, add the document comment shortcut key in eclipse1. For example, the default document comment:/*** @author XX**/2. Shor

Tags: shortcut keys for Terminal and set up shortcut keys for opening terminalLinux terminal usage tipsToday, I found that the Linux terminal has so many handy shortcuts.Shift+ctrl+t: New tab pageSHIFT+CTRL+W: Close tabCtrl+pageup: Previous tabCtrl+pagedown: Next tabShift+ctrl+pageup: Tab Shift leftShift+ctrl+pagedown: Tabs Move RightALT+1: Switch to tab page 1ALT+2: Switch to tab page 2ALT+3: Switch to tab

Common shortcut keys of Android Studio and how to use the shortcut keys of Eclipse Common shortcut keys of Android Studio and how to use the shortcut keys of Eclipse 1. display the list of recently edited files Ctrl + E 2. Quick Open Class Ctrl + N 3. Quickly open a file (it can be a file with extensions of various for

Generally, we can see that the terms "Index" and "key" are used for exchange, but they are actually different. An index is a physical structure stored in a database. A key is purely a logical concept. The key represents the integrity constraints created to implement business rules. The confusion between indexes and keys is generally caused by the use of indexes in the database to implement integrity constraints. Recommended reading: Automatic Indexing

Webstrom shortcut keys and webstorm shortcut keys20:32:59 Ctrl +/or Ctrl + Shift +/Note (// or) Shift + F6Rebuild-Rename Ctrl + XDelete row Ctrl + DCopy row Ctrl + GSearch rows Ctrl + Shift + Up/DownThe code is moved up/down. F2 or Shift + F2Highlight errors or warnings for quick locating Write code and press TabGenerate code Select text, press Ctrl + Shift + F7Highlight all the text and Press Esc to highlight the text. (Because of this function, I ca

? CTRL + D copies the current line to the next line equivalent to Ctrl + SHIFT + in eclipse CTRL +/single-line comments and anti-annotations CTRL +shift +/block annotations and anti-annotations CTRL + N then enter the class name to open the class file equivalent to Ctrl + SHIFT + T in eclipse CTRL + SHIFT + N Enter name to open all types of files equivalent to Ctrl +shift + R in eclipse CTRL + SHIFT + SPACE smart hint equals CTRL +/ in eclipse CTRL + ALT + L formatting code is equiva

Rlwrap-sqlplus flexible use of the up and down keys and the back and forth keys in Linux sqlplus is inconvenient to use. Both the up and down keys and the back and forth keys are not available, seriously reducing production efficiency. Rlwrap can solve this problem! Download rlwrap: http://download.csdn.net/detail/shar

Summary of common shortcut keys in VS2015 and shortcut keys in vs2015 Generate solution F6 and project Shift + F6 Debug and run F5. Terminate the debugging and run Shift + F5. Run Ctrl + F5 Find the next F3 instance and find the previous Shift + F3 instance. Attach to process Ctrl + Alt + P, execute F11 Statement by statement Switch breakpoint F9 (add or cancel breakpoint) Run Ctrl + F10 at the cursor Jump

Yesterday, when he was dealing with the database of the online forum, he found that he used the post number as the primary key. Due to some accidental modifications to it, the association of the post became messy. So we discussed how to select the primary key in the database table. I am not familiar with the program of the forum, so I don't know how it is designed and implemented. Today, Ling Hu can discuss this topic on javaeye. At first, I thought it would be a good way to use a meaningless lo

Shortcut Keys for eclipse and documentation and multi-line annotations 1. Multi-line comment shortcut 1. Select the area to be annotated and useCTRL + Shift + cOrCTRL +/ // Comments are added.2. Select the items you want to comment on and useShit + Ctrl +//***/Annotation is added. 3. If you click the above button again, the added comment will be removed.4. to modify the shortcut key of the command in eclispe, you only need to go to Windows> p

Win10 OS shortcut keys and win10 shortcut keys Windows 10 is a brand new operating system, with some unique Shortcut Keys designed. At the same time, most of the shortcuts in the old system can be used to master the shortcut keys, so you can leave the mouse behind and use only the keyboard to operate the computer. W