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Add new column with foreign key constraint in one command
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As so often with SQL-related question, it depends on the DBMS. Some DBMS allow you to combine ALTER table operations separated by commas. For example...
Informix syntax:
ALTER TABLE one
ADD two_id INTEGER,
ADD CONSTRAINT FOREIGN KEY(two_id) REFERENCES two(id);
The syntax for IBM DB2 LU...
Get characters after last / in url
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This cuts of the first character if there is no slash at all.
– redanimalwar
Nov 2 '15 at 13:55
@red...
How to remove single character from a String
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You can use Java String method called replace, which will replace all characters matching the first parameter with the second parameter:
String a = "Cool";
a = a.replace("o","");
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Skip download if files exist in wget?
... when you are downloading from a location that was copied, changing all the timestamps.
– Robert
Oct 28 '16 at 16:22
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How can I check whether an array is null / empty?
....println("array is empty");
}
An alternative definition of "empty" is if all the elements are null:
Object arr[] = new Object[10];
boolean empty = true;
for (int i=0; i<arr.length; i++) {
if (arr[i] != null) {
empty = false;
break;
}
}
or
Object arr[] = new Object[10];
boolean e...
Detect when a window is resized using JavaScript ?
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You can use .resize() to get every time the width/height actually changes, like this:
$(window).resize(function() {
//resize just happened, pixels changed
});
You can view a working demo here, it takes the new height/width values and updates them in the page for you to see. Remem...
New line in JavaScript alert box
... Why is this answer underrated? if your are thinking way more dynamically in terms of programming webpages this is a big help.
– Jimwel Anobong
Oct 25 '17 at 12:59
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What is SELF JOIN and when would you use it? [duplicate]
.... Isn't that whole point of doing a self join?
– A. Sallai
Jan 2 '17 at 10:36
1
don't we need AS ...
How to handle Back button with in the dialog?
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@dmmh if you don't call dialog.dismiss() will get a memory leak.
– CONvid19
Mar 31 '14 at 19:56
2
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iphone: Where the .dSYM file is located in crash report
...e dSYM file with the same name with your app, in the same folder.
Before all of these actions, make sure you have configured the xcode build settings right, as follows:
Generate Debug Symbols setting is enabled.
Debug Infomation Format are set to DWARF with dSYM File.
Hope this will help.
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