ocsa focus

somecolumn in (SELECT lookupcolumn from dbo. smallertable) Select Bigtable.id, somecolumn from BigTable INNER JOIN (SELECT DISTINCT lookupcolumn FROM dbo. Smallertable) as s = dbo. Bigtable.somecolumn Finally the query cost and the above is not the same, at this time the query performance cost is the same, I believe here we should be very clear. We can derive the performance overhead of inner join and in by the above-mentioned large number of pages, and when we are initially exploring the pe

, but only if both query columns cannot be NULL, otherwise use not EXISTS. And the left JOIN ... Is NULL because it always does not skip the already matched value, but the way to return all result sets First and then filter, its inefficiency is conceivable.SummarizeIn this section we compare the not exists and not in and left joins: Is null performance, finally came to the three performance analysis conclusions, the next section we have determined to be the last of the final article comparison e

([Idx_noncls_include_ Exceptorderid])' shenzhen ' GO As you know, nonclustered index columns do not need to contain columns that create a clustered index, so what exactly is the fact? Conclusion: In fact, there is no need for any nonclustered index column to contain the column that created the clustered index, because the column that creates the clustered index is part of the nonclustered Index collection column, which means that the nonclustered index collection column contains the clustered

Tags: completion time desc name Ott des ESC composition cotIt is necessary to familiarize yourself with the four tables under this user.View all table names:SELECT * FROM tab;To view the structure of each table:DESC 表名称；1, Department table: DeptNo Name type description1 DEPTNO Number (2) department numbers, two digits.2 dname VARCHAR2 (14) department name, up to 14 characters3 LOC VARCHAR2 (13) Department location2. Employee table: EMPNo Name type description1 EMPNO numer (4) The employee's numb

a.addressline1 like @AddressLine1 'IF(@AddressLine2 is not NULL)SET@SQL = @SQL +' and a.addressline2 like @AddressLine2 'IF(@City is not NULL)SET@SQL = @SQL +' and a.city like @City 'IF(@PostalCode is not NULL)SET@SQL = @SQL +' and a.postalcode like @PostalCode 'IF(@StateProvinceID is not NULL)SET@Recompile =0IF(PATINDEX ('%[%_?] %', @AddressLine1) >=4 ORPATINDEX ('%[%_?] %', @AddressLine2) =0) and(PATINDEX ('%[%_?] %', @City) >=4 ORPATINDEX ('%[%_?] %', @PostalCode) =0)SET@Re

string position, starting from high 1DECLARE @s varchar (10);Set @s= ' HelloWorld ';Print @s;Select @s, charindex (' W ', @s)--Find locationSelect @s,substring (@s,charindex (' W ', @s) +1,10) --replace replacementDECLARE @s varchar (20)Set @s= ' Hello World ';Print @s;Select @s,replace (@s, ' hello ', ' hello ') --stuff replacementDECLARE @s varchar (20)Set @s= ' Hello World 'Print @sSelect @s,stuff (@s,charindex (", @s), 1, ': ') --upper to uppercase, lower to lowercase --rtrim () Remove Righ

This article translated from: http://developer.android.com/training/managing-audio/audio-focus.html It is vital to consider how to interact with multiple potential audio playback programs. To avoid simultaneous playback of each music player, Android uses audio focus to control audio playback. Only applications with audio focus can play audio. Before your application starts playing the audio, it should reque

Article Description: for web designers, focus setting is a technique to better convey information and retain users, a bit like magic. It also requires practice and skill. Hope that these suggestions can help you, I wish your Web page can attract users faster! Try it on your next project. Creating focus: The center of gravity in Web design In Shakespeare's time, the audience is very not face, ta

: http://www.lanrentuku.com/js/jiaodiantu-1076.htmlTo modify a focus chart:CSS code:/* Lazy Gallery Collection and collation www.lanrentuku.com *//* focus map *//*-------------------------------here to modify the overall size (width:960px; height:500px;)-----------------------------------*/.focus{position:relative; width:960px; height:500px; Background-color: #00

To the photography enthusiasts to detailed analysis to share the Canon 7D camera Select Automatic Focus method. Method Sharing: For digital SLR cameras, a quick choice of automatic focus is the key to successful shooting. I hope you can skillfully operate the EOS 7D Multi-function control button, the main dial and speed control turntable, to capture the decisive moment. Using multifunctional control butt

Love programming has been in the collection of programming related knowledge and solutions, today's small series for everyone to bring 10 very common jquery Focus map plugin.1.jQuery Focus Graph Plug-in that automatically plays animationsWe've shared a lot of very useful jquery focus graph plugins before, and most of them can be used directly by developers. Today

Label:Recent projects need to apply accessibility, with a lot of focus and Blur, summarized as followsFirst, set focusCreate a Accessibility dialog box: When a dialog box appears, focus should be in the dialog box so that the user can continue browsing using the keyboard. The exact location of the focus set in the dialog box is largely dependent on the purpose of

Cool and practical jquery Focus chart appreciation and source codeThe focus diagram is widely used in modern web pages, with a focus on simplicity and elegance, and most of the jquery focus charts can slide and switch pictures and produce different animated effects when switching pictures. Today we're going to share so

This time to everyone to bring the use of Focus-within detailed, the use of Focus-within Note what, the following is the actual case, together to see. The world of CSS is really a magical world. Perhaps many front-end developers have heard: Focus has not heard: Focus-within. So: What the hell is

; // release the wifi lock wifiLock. release (); btn_play.setEnabled (true); Toast. makeText (this, "Stop playing", 0 ). show () ;}@ Override protected void onDestroy () {// reclaim resources when activity ends if (mediaPlayer! = Null mediaPlayer. isPlaying () {mediaPlayer. stop (); mediaPlayer. release (); mediaPlayer = null; // release the wifi lock wifiLock. release ();} super. onDestroy ();} MediaPlayer audio focus As we all know, Android is a

Focus as an important feature of JavaScript, basically interacting with the page is inseparable from the focus. But few people to focus on the management system to do summary induction. This article provides a detailed introduction to the focus management in JavaScriptFocus ElementIn the end, which elements can get the

Today's websites are paying more and more attention to people with disabilities. Many websites have begun to create convenient channels for people with poor eyesight to facilitate their Webpage Browsing. The following describes the focus management and blind websites, hoping to help you. Websites in the 21st century are paying more and more attention to people with disabilities. Other types of disability are worth mentioning. If people with poor eyesi

Single AF (one shot) is the most common. The working process of this mode is initiated by a half-press of the shutter, and the focus process continues until the focus is not accurate. Once the processor considers the focus to be accurate, it completes the shooting process as soon as the shutter is completely pressed, while the AF system stops working. The

Introduction to contrast focus, phase focus and triangulation focus principle and differenceContrast focus: Use the algorithm to identify the contrast of the screen and confirm the focus success when the contrast is highest. As the focus