大约有 18,400 项符合查询结果（耗时：0.0241秒） [XML]
What is the difference between partitioning and bucketing a table in Hive ?
...xample, suppose a table using date as the top-level partition and employee_id as the second-level partition leads to too many small partitions. Instead, if we bucket the employee table and use employee_id as the bucketing column, the value of this column will be hashed by a user-defined number into ...
How to use GROUP BY to concatenate strings in SQL Server?
...
[Note: This solution only works on SQL 2005 and later. Original question didn't specify the version in use.]
CREATE TABLE #YourTable ([ID] INT, [Name] CHAR(1), [Value] INT)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'A',4)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'B',8)
...
Correct use of Multimapping in Dapper
... ran a test that works fine:
var sql = "select cast(1 as decimal) ProductId, 'a' ProductName, 'x' AccountOpened, cast(1 as decimal) CustomerId, 'name' CustomerName";
var item = connection.Query<ProductItem, Customer, ProductItem>(sql,
(p, c) => { p.Customer = c; return p; }, splitOn:...
OnNotify函数 ON_NOTIFY消息总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...pResult)
{
NMHDR* hdr=(NMHDR*)lParam;
if( hdr->code==NM_CLICK && hdr->idFrom==IDC_BUTTON1)
{
MessageBox(L"你单击了Button1",L"消息");
}
return CDialog::OnNotify(wParam,lParam,pResult);
}
（OnNotify()不响应按钮单击事件？）
自定义WM_NOTIFY消息
习惯了用...
Laravel Migration Change to Make a Column Nullable
I created a migration with unsigned user_id . How can I edit user_id in a new migration to also make it nullable() ?
9 ...
How to get RelativeLayout working with merge and include?
...oogle.com/issues/36908001
To fix it, make sure you overwrite BOTH layout_width and layout_height when including, otherwise everything will be ignored.
share
|
improve this answer
|
...
Patterns for handling batch operations in REST web services?
...ource. For example, to delete several messages at once.
DELETE /mail?&id=0&id=1&id=2
It's a little more complicated to batch update partial resources, or resource attributes. That is, update each markedAsRead attribute. Basically, instead of treating the attribute as part of each reso...
Get current AUTO_INCREMENT value for any table
...
Is there a reason you can't SELECT MAX(id) FROM table_name?
– Brian
Apr 8 '15 at 23:53
...
How do I create a unique ID in Java? [duplicate]
I'm looking for the best way to create a unique ID as a String in Java.
11 Answers
11
...
In which case do you use the JPA @JoinTable annotation?
...le named Task and add a foreign key column to the task table named project_id:
Project Task
------- ----
id id
name name
project_id
This way, it will be possible to determine the project for each row in the task table. If you use this approach, in your en...