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What exactly does the .join() method do?
... using the JOIN method, we can add the distance between the words and also convert the list to the string.
This is Python output
'my name is kourosh'
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Count number of rows within each group
... standard nowadays to use .() instead of list() and setDT() to convert a data.frame to data.table. So in one step setDT(df)[, .N, by = .(year, month)].
– sindri_baldur
Sep 27 '19 at 11:33
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When and why will a compiler initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?
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It is used to detect writing through dangling pointers.
0xED or Aligned Fence 'No man's land' for aligned allocations. Using a
0xBD different value here than 0xFD allows the runtime
to detect not only writing outside the a...
MySQL Error 1215: Cannot add foreign key constraint
...ents_has_Staff.Staff_Emp_ID.
Perhaps the columns in the parent tables are INT UNSIGNED?
They need to be exactly the same data type in both tables.
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Database design for audit logging
...ed and by whom.
Here's a simple example:
CREATE TABLE dbo.Page(
ID int PRIMARY KEY,
Name nvarchar(200) NOT NULL,
CreatedByName nvarchar(100) NOT NULL,
CurrentRevision int NOT NULL,
CreatedDateTime datetime NOT NULL
And the contents:
CREATE TABLE dbo.PageContent(
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Restful API service
... use case of getting some data from a RESTful Web Service, you should look into ResultReceiver and IntentService.
This Service + ResultReceiver pattern works by starting or binding to the service with startService() when you want to do some action. You can specify the operation to perform and pass...
How can I retrieve Id of inserted entity using Entity framework? [closed]
...xt())
{
context.MyEntities.Add(myNewObject);
context.SaveChanges();
int id = myNewObject.Id; // Yes it's here
}
Entity framework by default follows each INSERT with SELECT SCOPE_IDENTITY() when auto-generated Ids are used.
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Best way to get identity of inserted row?
...the current IDENTITY value for a table that you have not inserted a record into."
The OUTPUT clause of the INSERT statement will let you access every row that was inserted via that statement. Since it's scoped to the specific statement, it's more straightforward than the other functions above. How...
Does Java have a HashMap with reverse lookup?
...s in this answer: stackoverflow.com/questions/787446/… (and the original interview). That's biased towards Google, for obvious reasons, but even so I think it's safe to say you're better off with Google Collections nowadays.
– Jonik
Nov 5 '09 at 18:21
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Printing leading 0's in C?
...i, o, u, x, X, a, A, e,
E, f, F, g, and G conversions, the converted value is padded on
the left with zeros rather than blanks. If the 0 and - flags
both appear, the 0 flag is ignored. If a precision is given
with a numeric c...