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When should I use semicolons in SQL Server?
...llowing two queries (copied from this post):
BEGIN TRY
BEGIN TRAN
SELECT 1/0 AS CauseAnException
COMMIT
END TRY
BEGIN CATCH
SELECT ERROR_MESSAGE()
THROW
END CATCH
BEGIN TRY
BEGIN TRAN
SELECT 1/0 AS CauseAnException;
COMMIT
END TRY
BEGIN CATCH
SELECT ERROR_MES...
How to take backup of a single table in a MySQL database?
...
You can use easily to dump selected tables using MYSQLWorkbench tool ,individually or group of tables at one dump then import it as follow: also u can add host information if u are running it in your local by adding -h IP.ADDRESS.NUMBER after-u usernam...
libxml/tree.h no such file or directory
...n two ways:
1. Target settings
Click on your target (not your project) and select Build Phases.
Click on the reveal triangle titled Link Binary With Libraries. Click on the + to add a library.
Scroll to the bottom of the list and select libxml2.dylib. That adds the libxml2 library to your project.
2...
What is the difference between Debug and Release in Visual Studio?
...nfig (debug and release). When publishing, we can publish according to our selection in the publish dialog. But, when running application, despite I select Debug, it uses release config (bacause I set debug config in base and debug config), is that normal?
– Jonathan
...
How do I center a window onscreen in C#?
...
Using the Property window
Select form → go to property window → select "start position" → select whatever the place you want.
Programmatically
Form form1 = new Form();
form1.StartPosition = FormStartPosition.CenterScreen;
form1.ShowDialog();
...
Store boolean value in SQLite
...TO foo VALUES("0.0");
sqlite> INSERT INTO foo VALUES("1.0");
sqlite> select mycolumn, typeof(mycolumn) from foo;
0|integer
1|integer
0|integer
1|integer
0|integer
1|integer
and some that will fail:
sqlite> INSERT INTO foo VALUES("-1");
Error: constraint failed
sqlite> INSERT INTO foo ...
Dismiss keyboard by touching background of UITableView
...reRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard)];
[self.tableView addGestureRecognizer:gestureRecognizer];
And the hideKeyboard method might look like this:
- (void) hideKeyboard {
[textField1 resignFirstResponder];
[textField2 resignFirst...
Choosing a file in Python with simple Dialog
...= askopenfilename() # show an "Open" dialog box and return the path to the selected file
print(filename)
Done!
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Good way of getting the user's location in Android
...t seems to work pretty well so far.
/**
* try to get the 'best' location selected from all providers
*/
private Location getBestLocation() {
Location gpslocation = getLocationByProvider(LocationManager.GPS_PROVIDER);
Location networkLocation =
getLocationByProvider(LocationMan...
When and why are database joins expensive?
...s back to mitigating the size of the working set. Joins involving properly selected keys with correctly set up indexes are cheap, not expensive, because they allow significant pruning of the result before the rows are materialised.
Materialising the result involves bulk disk reads which are the mo...