大约有 48,000 项符合查询结果（耗时：0.0809秒） [XML]
GroupBy pandas DataFrame and select most common value
.... To clean the data I have to group by data frame by first two columns and select most common value of the third column for each combination.
...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎 ...
...允许您修改数据库以使其兼容。
此设置会影响各种 Select 方法返回结果行的方式。
当此属性为 false 时，Select 方法返回的列表中的每个元素将是一个简单的值列表，这些值表示为每个匹配行选择的列的值。
当此属性为 true ...
Max return value if empty query
...oeSize = Workers.Where(x => x.CompanyId == 8)
.Select(x => x.ShoeSize)
.DefaultIfEmpty(0)
.Max();
The zero in DefaultIfEmpty is not necessary.
...
using facebook sdk in Android studio
... what you want).
Open project structure by Ctrl + Shift + Alt + S and then select dependencies tab. Click on + button and select Module Dependency. In the new window pop up select :facebook.
You should be good to go.
Instructions for older Android Studio and older Facebook SDK
This applies to A...
A circular reference was detected while serializing an object of type 'SubSonic.Schema .DatabaseColu
...
I think maybe selecting the ones I want may work I think the circular reference is because in Event I have IQueryable<Category> which in turn will have a IQueryable<Event>
– Jon
Jul 20 '09...
How to load assemblies in PowerShell?
...me;
These should also work:
Add-Type -AssemblyName $TypeName -PassThru | Select-Object -ExpandProperty Assembly | Select-Object -ExpandProperty FullName -Unique
If I want my script to always use a specific version of a .dll but I can't be certain of where it's installed, how do I determine what ...
How to output MySQL query results in CSV format?
...ech-recipes.com/rx/1475/save-mysql-query-results-into-a-text-or-csv-file/
SELECT order_id,product_name,qty
FROM orders
WHERE foo = 'bar'
INTO OUTFILE '/var/lib/mysql-files/orders.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n';
Using this command columns names will not be e...
Script to kill all connections to a database (More than RESTRICTED_USER ROLLBACK)
... Server 2012 and above
USE [master];
DECLARE @kill varchar(8000) = '';
SELECT @kill = @kill + 'kill ' + CONVERT(varchar(5), session_id) + ';'
FROM sys.dm_exec_sessions
WHERE database_id = db_id('MyDB')
EXEC(@kill);
For MS SQL Server 2000, 2005, 2008
USE master;
DECLARE @kill varchar(8000...
What is the advantage of using heredoc in PHP? [closed]
...e day I used to use them to construct SQL queries:
$sql = <<<SQL
select *
from $tablename
where id in [$order_ids_list]
and product_name = "widgets"
SQL;
To me this has a lower probability of introducing a syntax error than using quotes:
$sql = "
select *
from $tablename
where ...
MySQL table is marked as crashed and last (automatic?) repair failed
... This was a quick fix! Had a "bad" options table. Make sure that you select the correct database first !
– jyllstuart
Jan 10 '19 at 15:54
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