大约有 40,000 项符合查询结果（耗时：0.0380秒） [XML]
T-SQL: Deleting all duplicate rows but keeping one [duplicate]
...e AS (
SELECT[foo], [bar],
row_number() OVER(PARTITION BY foo, bar ORDER BY baz) AS [rn]
FROM TABLE
)
DELETE cte WHERE [rn] > 1
Play around with it and see what you get.
(Edit: In an attempt to be helpful, someone edited the ORDER BY clause within the CTE. To be clear, you can order ...
In Python, how can you load YAML mappings as OrderedDicts?
I'd like to get PyYAML 's loader to load mappings (and ordered mappings) into the Python 2.7+ OrderedDict type, instead of the vanilla dict and the list of pairs it currently uses.
...
Accessing elements of Python dictionary by index
...myDict['Apple']['American']
In all of these cases it doesn't matter what order the dictionaries actually store the entries. If you are really concerned about the order, then you might consider using an OrderedDict:
http://docs.python.org/dev/library/collections.html#collections.OrderedDict
...
Interfaces — What's the point?
...zza type. Any instance whose type inherits from IPizza is guaranteed to be orderable, as it has an Order() method.
Python is not statically-typed, therefore types are kept and looked up at runtime. So you can try calling an Order() method on any object. The runtime is happy as long as the object ha...
What is the “right” way to iterate through an array in Ruby?
...eys than the values, and I am usually dealing with keys and values in that order, either key => value or hash[key] = value.
If you want duck-typing, then either explicitly use a defined method as Brent Longborough showed, or an implicit method as maxhawkins showed.
Ruby is all about accommodati...
How to get all columns' names for all the tables in MySQL?
...
select * from information_schema.columns
where table_schema = 'your_db'
order by table_name,ordinal_position
share
|
improve this answer
|
follow
|
...
Rank function in MySQL
...rRank := @curRank + 1 AS rank
FROM person p, (SELECT @curRank := 0) r
ORDER BY age;
The (SELECT @curRank := 0) part allows the variable initialization without requiring a separate SET command.
Test case:
CREATE TABLE person (id int, first_name varchar(20), age int, gender char(1));
INSERT...
Mapping composite keys using EF code first
...
You definitely need to put in the column order, otherwise how is SQL Server supposed to know which one goes first? Here's what you would need to do in your code:
public class MyTable
{
[Key, Column(Order = 0)]
public string SomeId { get; set; }
[Key, Column(...
xUnit : Assert two List are equal?
...zes collections so you just need to do
Assert.Equal(expected, actual); // Order is important
You can see other available collection assertions in CollectionAsserts.cs
For NUnit library collection comparison methods are
CollectionAssert.AreEqual(IEnumerable, IEnumerable) // For sequences, order ...
SortedList, SortedDictionary and Dictionary
...ary<K,V> is equal or faster in every case than Sorted analog, but if order of elements is required, e.g. to print them, Sorted one is chosen.
Src: http://people.cs.aau.dk/~normark/oop-csharp/html/notes/collections-note-time-complexity-dictionaries.html
...