how improve typing speed

with exists in many cases:Select num from a where num in (select num from B)Replace with the following statement:Select num from a where exists (select 1 from b where num=a.num)14. Not all indexes are valid for queries, SQL is query-optimized based on data in the table, and when there is a large amount of data duplication in the index columns, SQL queries may not take advantage of the index, as there are fields in the table Sex,male, female almost half, So even if you build an index on sex, it

I would like to introduce you to the method of the wireless router relay function. Many people may not understand the function of the wireless router relay function. It does not matter. After reading this article, you will certainly have a lot of GAINS to make your signal stronger. Use the wireless router relay function to improve network speed My Wireless Router IP address 192.168.1.1 DHCP is off and no en

Remove duplicate data on the basis of a large DataTable, create two small DataTable respectively, save multiple database connections, improve efficiency, speed up program running, datatable updates Database DataTable tab = new DataTable (); Tab = DBUtil. GetDataSet (strCmd, "TESTA. V_YHJ_VIP_WX_XSMX"). Tables [0]; Create a small table: DataView view = new DataView (tab );DataTable orderTable = view. ToTable

Write a static cache using PHP to improve the speed of the site's code, the need for friends, you can refer to the next.One, the following code requirements: 1. The system supports PHP 2. Support File_get_contents file_put_contents [can also be replaced with functions of the same function] 3. Best support GzcompressIi. use Method 1. Download the huncun.php file that you shared below 2. Huancun (or other) 3.

How to improve query speed by using PHP to process millions data

= "1"HcDoDynamicCompression= "TRUE"HcDoOnDemandCompression= "TRUE"HcDoStaticCompression= "TRUE"HcDynamicCompressionLevel= "0"hcfileextensions="htm HTML txt"HcOnDemandCompLevel= "10"hcpriority= "1"hcscriptfileextensions="ASP dll exe">Replace with:Hccompressiondll= "%windir%\system32\inetsrv\gzip.dll"HcCreateFlags= "1"HcDoDynamicCompression= "TRUE"HcDoOnDemandCompression= "TRUE"HcDoStaticCompression= "TRUE"HcDynamicCompressionLevel= "10"hcfileextensions="html css js htm XML txt"HcOnDemandCompLevel

1. Create the Gradle.properties file in the following directory/home/Add in Folder# project-wide Gradle settings.# IDE (e.g. Android Studio) users:# settings specified in this file would override any Gradl E settings# configured through the ide.# for more details about how to configure your build environment visit# Http://www.gra dle.org/docs/current/userguide/build_environment.html# The Gradle daemon aims to improve the startup and execution time of

Win7 system how to shut down the firewall to improve the computer running speed 1, the computer desktop in the lower left corner of the location of the Start menu options; 2, then will pop up, Start menu options, to click on the pop-up menu in the "Control Panel" option; 3, and then entered the control Panel, to click on the control Panel in the "System and security" option;

How to improve the input speed of WPS table data: With the WPS Office 2012 table Open, use the mouse box to select the range you want to fill in the data. As shown in the figure. First, find the Data tab in the toolbar of the WPS table, click on the "Effectivity" button, and open the Data Validation dialog box, as shown in the figure. Next we set the validation criteria for the da

How to optimize the system to improve the running speed of XP computer Symptom: feel very slow when using XP system. Workaround: Individual users can remove features that do not need to be enabled in the system to conserve resource usage. The specific steps are as follows. 1, open the Control Panel window, double-click the "Programs and features" icon, 2, after performing 搮, open the "Programs and Fun

Extjs itself is a slow load of the JS framework, which requires a lot of programmers to optimize, previously said JS packaging optimization This time to write write how to reduce redundant code, but also to improve the speed, including 1, delete code General 2, submit Form Universal 3, initialize gird generic this time write-only delete code optimization Post the Code First Copy Code code as follows:

, and cancel the Enable Hibernate checkbox. 12, clear system Temporary files: The system's temporary files are generally stored in two locations: a Windows installation directory of the Temp folder, the other is x:documents and settings "user name" local settingstemp folder (y: is the partition on which the system resides). The files in both locations can be deleted directly. 13, clear the Internet temporary files: regularly deleted when the internet generated a large number of temporary Inter

Reduce JS CSS volume, improve loading speed Browser parsing JS and CSS He is not to see the blank line, enter, tab. But a JS and CSS file blank line, career change and tabs but occupy a file at least 15% of the volume, the United States its name Yue: indentation. Like what Global.jsvar a=1;if (a) {alert (a);} Let's minify him out. Does not affect browser resolution ~ ~ and loading speed.and save the v

Atitit. Improve backup file copy speed (3)----Create a synchronous delete script 1. Two ways to create a synchronous delete script: 1 2.1 Info2 file from Recycle Bin ... 1 3. Cleanup ends in post-snap comparison 1 4. NPP replace Gene del from LST 1 5. Code 2 1. Two ways to create a synchronous delete script : 2.1 Info2 file from Recycle Bin ... Copy Info2 {String s= "G:\\recycler\\s-1-5-21-602162

Sometimes in the online need to fill out some personal information, fill in the process we will see some things drop-down list to choose. In the WPS form, we can also add the Drop-down list to improve the speed of input. The following small series for you to introduce the next Drop-down list set up method. I. Scope of selection With the WPS Office 2012 table Open, use the mouse box to select the range you

Atitit. Improve backup file copy speed (4)---Data mining get a list of Recycle Bin files 1. How to put the Recycle Bin and 1 2. info2 File Structure 1 3. Get a list of files 2 methods: Regular expression or parsing 1 4. Path regular expression [a-za-z]\:[\\a-za-z0-9\xb0-\xf7\xa1-\xfe_.~]+ 2 5. Reference 2 1. How to put the Recycle Bin and The Info2 file records the appropriate information for each file th

Data Sheet Dh_order_detail A total of 169,247 dataRaw SQLSelectfrom_unixtime (order_time, '%h:%i ') ' Time ', City,district,left (company, 6) Company,goods_num,order_price,order _code,order_timefromdh_order_detailwhereprovince_id = GROUP by Order_codeorder Byorder_time DESCLIMIT 50Running time 4 seconds moreImproved, move GROUP by outwardSelect*from (Selectfrom_unixtime (order_time, '%h:%i ') ' Time ', City,district,left (company, 6) Company,goods_num,order _price,o

, that is to say how many queries you come over, only a service personnel reception, the following query all please queue up.OK, after modifying the SQL memory and CPU configuration items, you can try restarting the SQL Server service, or restart the server directly, the effect is still obvious. Today's discussion is here, you are welcome to discuss together, thank you!This article is from the "June Ma Run Space" blog, be sure to keep this source http://horse87.blog.51cto.com/2633686/1909461SQL