大约有 15,000 项符合查询结果（耗时：0.0330秒） [XML]
Rails: select unique values from a column
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Model.select(:rating)
Result of this is a collection of Model objects. Not plain ratings. And from uniq's point of view, they are completely different. You can use this:
Model.select(:rating).map(&:rating).uniq
or this (mo...
How do I pass command-line arguments to a WinForms application?
...ibleTextRenderingDefault(false);
Application.Run(new Form1(args[0], Convert.ToInt32(args[1])));
}
}
In windows form class, add a parameterized constructor which accepts the input values from Program class as like below.
public Form1(string s, int i)
{
if (s != null &&...
Select top 10 records for each category
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If you are using SQL 2005 you can do something like this...
SELECT rs.Field1,rs.Field2
FROM (
SELECT Field1,Field2, Rank()
over (Partition BY Section
ORDER BY RankCriteria DESC ) AS Rank
FROM table
) rs WHERE Rank <= 10
If y...
C++: How to round a double to an int? [duplicate]
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The cast is unnecessary; the result will be implicitly converted to int.
– Keith Thompson
Mar 14 '12 at 3:04
8
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How to drop all tables in a SQL Server database?
...VARCHAR(500) DECLARE @Cursor CURSOR
SET @Cursor = CURSOR FAST_FORWARD FOR
SELECT DISTINCT sql = 'ALTER TABLE [' + tc2.TABLE_SCHEMA + '].[' + tc2.TABLE_NAME + '] DROP [' + rc1.CONSTRAINT_NAME + '];'
FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc1
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS t...
Good tool to visualise database schema? [closed]
...; Export > Graphviz Dot and export your database) 3.) Open terminal and convert dot file to SVG dot -Tsvg your_database.dot > your_database.svg 4.) Optionally convert generated SVG to JPG or PNG using any tool of your choice (Inkscape, ImageMagick, GraphicsMagick, etc.)
–...
Git diff output to file preserve coloring
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@RoR You'd have to put something in the middle there to convert the bash color codes to rtf format.
– ralphtheninja
Mar 14 '12 at 17:23
3
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Use variable with TOP in select statement in SQL Server without making it dynamic [duplicate]
...es, in SQL Server 2005 it's possible to use a variable in the top clause.
select top (@top) * from tablename
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How to unit test abstract classes: extend with stubs?
... then you can factor out the helper methods into one class (scenario2) and convert the inheritance tree into a strategy pattern.
If you find you have some methods your base class implements directly and other are virtual, then you can still convert the inheritance tree into a strategy pattern, but...
Ruby on Rails form_for select field with class
I am beating my head against the wall on this one. I want to make a simple select tag using the f.select tag but nothing I do works. I put an example below:
...