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Split column at delimiter in data frame [duplicate]
...ke to split one column into two within at data frame based on a delimiter. For example,
6 Answers
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How to get last N records with activerecord?
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For Rails 3, see Bongs' reply instead. This way still works, but is no longer the preferred way.
– Kyle Heironimus
Apr 6 '12 at 16:42
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How can I get LINQ to return the object which has the max value for a given property? [duplicate]
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.OrderByDescending(i=>i.id).Take(1)
Regarding the performance concern, it is very likely that this method is theoretically slower than a linear approach. However, in reality, most of the time we are not dealing with the data set that is big enough to make any difference.
If pe...
How to implement a many-to-many relationship in PostgreSQL?
...the name of a product is hardly unique (not a good "natural key"). Also, enforcing uniqueness and referencing the column in foreign keys is typically cheaper with a 4-byte integer (or even an 8-byte bigint) than with a string stored as text or varchar.
Don't use names of basic data types like date ...
Move to another EditText when Soft Keyboard Next is clicked on Android
...p="@+id/.."
Besides directional navigation you can use tab navigation. For this you need to use
android:nextFocusForward="@+id/.."
To get a particular view to take focus, call
view.requestFocus()
To listen to certain changing focus events use a View.OnFocusChangeListener
Keyboard butto...
How to get the currently logged in user's user id in Django?
...henticated, like so:
if request.user.is_authenticated:
# Do something for authenticated users.
else:
# Do something for anonymous users.
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Execute Insert command and return inserted Id in Sql
...ce of id you can write your key that you want to return. do it like this
FOR SQL SERVER 2005 and above
using(SqlCommand cmd=new SqlCommand("INSERT INTO Mem_Basic(Mem_Na,Mem_Occ) output INSERTED.ID VALUES(@na,@occ)",con))
{
cmd.Parameters.AddWithValue("@na", Mem_NA);
cmd.Pa...
How to get the insert ID in JDBC?
...it is an auto generated key, then you can use Statement#getGeneratedKeys() for this. You need to call it on the same Statement as the one being used for the INSERT. You first need to create the statement using Statement.RETURN_GENERATED_KEYS to notify the JDBC driver to return the keys.
Here's a b...
Insert Update stored proc on SQL Server
...lled upsert/merge.
Importance of UPSERT - from sqlservercentral.com:
For every update in the case mentioned above we are removing one
additional read from the table if we
use the UPSERT instead of EXISTS.
Unfortunately for an Insert, both the
UPSERT and IF EXISTS methods use the
same...
Spring MVC: Complex object as GET @RequestParam
...uppose i have a page that lists the objects on a table and i need to put a form to filter the table. The filter is sent as an Ajax GET to an URL like that: http://foo.com/system/controller/action?page=1&prop1=x&prop2=y&prop3=z
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