大约有 40,000 项符合查询结果（耗时：0.0200秒） [XML]
SQL Server indexes - ascending or descending, what difference does it make?
...y Optimiser's point of view.
For the table definition
CREATE TABLE T1( [ID] [int] IDENTITY NOT NULL,
[Filler] [char](8000) NULL,
PRIMARY KEY CLUSTERED ([ID] ASC))
The Query
SELECT TOP 10 *
FROM T1
ORDER BY ID DESC
Uses an ordered scan with scan direction BAC...
ActiveRecord.find(array_of_ids), preserving order
When you do Something.find(array_of_ids) in Rails, the order of the resulting array does not depend on the order of array_of_ids .
...
Migration: Cannot add foreign key constraint
...ma::create('priorities', function($table) {
$table->increments('id', true);
$table->integer('user_id')->unsigned();
$table->string('priority_name');
$table->smallInteger('rank');
$table->text('class');
$table->timestamps('timecreat...
How can I verify a Google authentication API access token?
...xxxxxxx-xxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com",
"user_id": "xxxxxxxxxxxxxxxxxxxxxxx",
"scope": "https://www.googleapis.com/auth/userinfo.profile https://gdata.youtube.com",
"expires_in": 3340,
"access_type": "offline"
}
The scope is the given permission of t...
RESTful on Play! framework
...ept header for content negotiation. First the routes file:
GET /user/{id} Application.user
POST /user/ Application.createUser
PUT /user/{id} Application.updateUser
DELETE /user/{id} Application.deleteUser
You don't specify any content ty...
Efficiently convert rows to columns in sql server
... from yourtable
group by ColumnName, id
order by id
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = N'SELECT ' + @cols + N' from
(
select value, Column...
scopes with lambda and arguments in Rails 4 style?
...
I think it should be:
scope :find_lazy, -> (id) { where(id: id) }
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How to COUNT rows within EntityFramework without loading contents?
...y syntax:
var count = (from o in context.MyContainer
where o.ID == '1'
from t in o.MyTable
select t).Count();
Method syntax:
var count = context.MyContainer
.Where(o => o.ID == '1')
.SelectMany(o => o.MyTable)
.Coun...
How to delete from multiple tables in MySQL?
...ement.
DELETE p, pa
FROM pets p
JOIN pets_activities pa ON pa.id = p.pet_id
WHERE p.order > :order
AND p.pet_id = :pet_id
Alternatively you can use...
DELETE pa
FROM pets_activities pa
JOIN pets p ON pa.id = p.pet_id
WHERE p.order > :order
AND p.pet_...
How to get CSS to select ID that begins with a string (not in Javascript)?
...
[id^=product]
^= indicates "starts with". Conversely, $= indicates "ends with".
The symbols are actually borrowed from Regex syntax, where ^ and $ mean "start of string" and "end of string" respectively.
See the specs for ...