大约有 46,000 项符合查询结果（耗时：0.0694秒） [XML]
Select a Dictionary with LINQ
I have used the "select" keyword and extension method to return an IEnumerable<T> with LINQ, but I have a need to return a generic Dictionary<T1, T2> and can't figure it out. The example I learned this from used something in a form similar to the following:
...
How to find duplicates in 2 columns not 1
...composite key between the two fields. This will require a unique stone_id and upcharge_title for each row.
As far as finding the existing duplicates try this:
select stone_id,
upcharge_title,
count(*)
from your_table
group by stone_id,
upcharge_title
having coun...
Are PostgreSQL column names case-sensitive?
I have a db table say, persons in Postgres handed down by another team that has a column name say, "first_Name" . Now am trying to use PG commander to query this table on this column-name.
...
Where does this come from: -*- coding: utf-8 -*-
... answered Feb 2 '11 at 8:33
Andrea SpadacciniAndrea Spadaccini
11k33 gold badges3434 silver badges5050 bronze badges
...
@Column(s) not allowed on a @ManyToOne property
...
@OndrejTokar maybe because You use @ManyToOne on this, and "mappedBy" on the other side (class), which means that this column (named "LicenseeFK") is a foreign key, and therefore a joined column. So, it is a joinedColumn with name "LicenseeFK". I hope it is clear now.
...
Selecting multiple columns in a pandas dataframe
...1 = df[['a', 'b']]
Alternatively, if it matters to index them numerically and not by their name (say your code should automatically do this without knowing the names of the first two columns) then you can do this instead:
df1 = df.iloc[:, 0:2] # Remember that Python does not slice inclusive of the ...
adding x and y axis labels in ggplot2
How do I change the x and y labels on this graph please?
1 Answer
1
...
Difference between .success() and .complete()?
...AX methods return a jqXHR object that provides .error() , .success() , and .complete() methods.
4 Answers
...
Post an empty body to REST API via HttpClient
... POST but with an empty body. I'm new to using the WCF Web API HttpClient and I can't seem to find out the write code that would do a post with an empty body. I find references to some HttpContent.CreateEmpty() method, but I don't think that is for the Web API HttpClient code since I can't seem to...
URL query parameters to dict python
Is there a way to parse a URL (with some python library) and return a python dictionary with the keys and values of a query parameters part of the URL?
...