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Select distinct values from a table field
...want any ordering to be applied to a query, not even the default ordering, call order_by() with no parameters.
and distinct() in the note where it discusses issues with using distinct() with ordering.
To query your DB, you just have to call:
models.Shop.objects.order_by().values('city').distinct...
MVC which submit button has been pressed
... to the name submit or button in the controller method parameters, you can call it as you like...
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Return all enumerables with yield return at once; without looping through
...important difference between the two implementations though: this one will call all of the methods immediately, even though it will only use the returned iterators one at a time. Your existing code will wait until it's looped through everything in GetMoreErrors() before it even asks about the next e...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
...nd.
Scope means the immediate context of a command. Every stored procedure call executes in its own scope, and nested calls execute in a nested scope within the calling procedure's scope. Likewise, a SQL command executed from an application or SSMS executes in its own scope, and if that command fire...
Notification passes old Intent Extras
...ngIntent contentIntent = PendingIntent.getActivity(context, UNIQUE_INT_PER_CALL, notificationIntent, 0);
intents are not created if you send the same params. They are reused.
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Accessing an SQLite Database in Swift
...probably use one of the many SQLite wrappers, if you wanted to know how to call the SQLite library yourself, you would:
Configure your Swift project to handle SQLite C calls. If using Xcode 9 or later, you can simply do:
import SQLite3
Create/open database.
let fileURL = try! FileManager.defaul...
SQL query return data from multiple tables
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10 rows in set (0.00 sec)
The other is probably more often used and is called table aliasing. The tables in this example have nice and short simple names, but typing out something like KPI_DAILY_SALES_BY_DEPARTMENT would probably get old quickly, so a simple way is to nickname the table like thi...
How to make a SPA SEO crawlable?
...ide you only have a single html page which interacts with the server dynamically via AJAX calls. that's what SPA is about. All the a tags in the client side are created dynamically in my application, we'll later see how to make these links visible to google's bot in the server. Each such a tag nee...
How can I stop a running MySQL query?
... MySQL on AWS RDS, you won't have permission to run KILL, but you can run: CALL mysql.rds_kill(12345)
– Kip
Mar 23 '17 at 19:51
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The SQL OVER() clause - when and why is it useful?
...R clause when combined with PARTITION BY state that the preceding function call must be done analytically by evaluating the returned rows of the query. Think of it as an inline GROUP BY statement.
OVER (PARTITION BY SalesOrderID) is stating that for SUM, AVG, etc... function, return the value OVER...