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SQL JOIN - WHERE clause vs. ON clause
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They are not the same thing.
Consider these queries:
SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
WHERE Orders.ID = 12345
and
SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
AND Orders.ID = 1234...
Check if key exists and iterate the JSON array using Python
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import json
jsonData = """{"from": {"id": "8", "name": "Mary Pinter"}, "message": "How ARE you?", "comments": {"count": 0}, "updated_time": "2012-05-01", "created_time": "2012-05-01", "to": {"data": [{"id": "1543", "name": "Honey Pinter"}]}, "type": "status", "i...
What is the difference between libsqlite3.dylib and libsqlite3.0.dylib?
...u add libsqlite3.dylib and add libsqlite3.0.dylib to actually add the same file, there is no difference, then why you want to add libsqlite3.dylib?
The because libsqlite3.dylib always points to the latest sqlite3 dynamic library, that is if there is a new dynamic library (eg: libsqlite3.1.dylib) li...
Converting JSON data to Java object
... Google's Gson as a potential JSON plugin. Can anyone offer some form of guidance as to how I can generate Java from this JSON string?
Google Gson supports generics and nested beans. The [] in JSON represents an array and should map to a Java collection such as List or just a plain Java array. The ...
Calling a Fragment method from a parent Activity
I see in the Android Fragments Dev Guide that an "activity can call methods in a fragment by acquiring a reference to the Fragment from FragmentManager, using findFragmentById() or findFragmentByTag() ."
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Android webview slow
...Is this pasteable directly in the android manifest being that the manifest file is XML. Or is this supposed to be validated in the source code when loading the webview. Sorry for the noob question.
– xMythicx
Jul 28 '14 at 15:09
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How to implement Android Pull-to-Refresh
In Android applications such as Twitter (official app), when you encounter a ListView, you can pull it down (and it will bounce back when released) to refresh the content.
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SQL Server Insert if not exists
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instead of below Code
BEGIN
INSERT INTO EmailsRecebidos (De, Assunto, Data)
VALUES (@_DE, @_ASSUNTO, @_DATA)
WHERE NOT EXISTS ( SELECT * FROM EmailsRecebidos
WHERE De = @_DE
AND Assunto = @_ASSUNTO
AND Data = @_D...
Is there a MySQL option/feature to track history of changes to records?
...he business requirement is "I want to audit the changes to the data - who did what and when?", you can usually use audit tables (as per the trigger example Keethanjan posted). I'm not a huge fan of triggers, but it has the great benefit of being relatively painless to implement - your existing code ...
Get class name using jQuery
...s jQuery object via other means than its class, then
var className = $('#sidebar div:eq(14)').attr('class');
should do the trick. For the ID use .attr('id').
If you are inside an event handler or other jQuery method, where the element is the pure DOM node without wrapper, you can use:
this.clas...