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How do SQL EXISTS statements work?
... criteria -- this is why it can be faster than IN. Also be aware that the SELECT clause in an EXISTS is ignored - IE:
SELECT s.*
FROM SUPPLIERS s
WHERE EXISTS (SELECT 1/0
FROM ORDERS o
WHERE o.supplier_id = s.supplier_id)
...should hit a division by zero error...
Upgrading PHP in XAMPP for Windows?
...
Take a backup of your htdocs and data folder (subfolder of MySQL folder), reinstall upgraded version and replace those folders.
Note:
In case you have changed config files like PHP (php.ini), Apache (httpd.conf) or any other, please take back up of those files as well and replace th...
App Inventor 2 接入百度网盘API · App Inventor 2 中文网
...框】
接入文档
使用Web浏览框，里面要输入网盘用户名密码，成功后返回的url中拿出access_token
这里使用简单模式，回调网页，在回调后的URL中拿出access_token，后面操作都需要它：
http://openapi.baidu.com/oauth/2.0/authorize?display=mobil...
Why would you use Oracle database? [closed]
...acle database versus the latest flavors of:
1) Microsoft SQL Server
2) MySQL
3) PostgreSQL
6 Answers
...
Create Test Class in IntelliJ
...
Use the menu selection Navigate -> Test, or Ctrl+Shift+T (Shift+⌘+T on Mac). This will go to the existing test class, or offer to generate it for you through a little wizard.
...
How to enable PHP's openssl extension to install Composer?
...er having to look at this answer i figured out wamp was using 5.5.12 but i selected 5.4 directory for php.exe
– Afnan Bashir
Oct 4 '14 at 10:45
...
What does character set and collation mean exactly?
I can read the MySQL documentation and it's pretty clear. But, how does one decide which character set to use? On what data does collation have an effect?
...
常用快速产品原型设计工具推荐 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...了解用例的用户界面；
系统分析员，用来了解用户界面如何影响系统分析；
设计员，用来了解用户界面如何施加影响及它对系统“内部”的要求；
类测试人员，用来制定测试计划活动。
如何高效完成优秀原型设计，工具自...
MySQL Cannot drop index needed in a foreign key constraint
...column. I'm trying to remove the current index but keep getting the error MySQL Cannot drop index needed in a foreign key constraint
...
Reading an Excel file in PHP [closed]
...)->Name = $WorkSheetName;
$this->xlBook->Worksheets(1)->Select;
if($XlsColumnWidth != null)
{
//$XlsColumnWidth = array("A1"=>15,"B1"=>20);
foreach($XlsColumnWidth as $Clm=>$Width)
{
//Set Columns Width
...