大约有 6,000 项符合查询结果（耗时：0.0181秒） [XML]
Could not find an implementation of the query pattern
...ying to create a database connection using LINQ.
First I add a new LINQ to SQL class, and drag my table called "tblPersoon" into it.
...
PostgreSQL: Can you create an index in the CREATE TABLE definition?
...em to be any way of specifying an index in the CREATE TABLE syntax. PostgreSQL does however create an index for unique constraints and primary keys by default, as described in this note:
PostgreSQL automatically creates an index for each unique constraint and primary key constraint to enforce un...
How to completely uninstall Visual Studio 2010?
... "name like 'microsoft visual%'" call uninstall /nointeractive
Repeat for SQL etc by replacing visual% in above command with sql.
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How do we count rows using older versions of Hibernate (~2009)?
...
What's the point of using an ORM if we end up coding SQL anyway?
– thermz
Apr 17 '12 at 15:35
Th...
Why are joins bad when considering scalability?
..., you mention "Materialized/indexed views". Are you talking about regular SQL views, or something else?
– slolife
Apr 30 '10 at 23:40
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How do I (or can I) SELECT DISTINCT on multiple columns?
... of the currently accepted answer by factor 10 - 15 (in my tests on PostgreSQL 8.4 and 9.1).
But this is still far from optimal. Use a NOT EXISTS (anti-)semi-join for even better performance. EXISTS is standard SQL, has been around forever (at least since PostgreSQL 7.2, long before this question w...
nullable object must have a value
...on methods (e.g. Select, Where), the lambda function might be converted to SQL that might not behave identically to your C# code. For instance, C#'s short-circuit evaluated && and || are converted to SQL's eager AND and OR. This can cause problems when you're checking for null in your lambda...
StringUtils 字符串工具扩展：强大的文本处理工具集 · App Inventor 2 中文网
...的文本处理工具函数。它提供了丰富的字符串操作方法，包括字符检测、文本提取、填充、验证等功能。
主要功能
字符和大小写检测
文本提取（左、右、中间）
文本填充和居中
字符串缩写
ASCII 码...
NoSQL Use Case Scenarios or WHEN to use NoSQL [closed]
...
It really is an "it depends" kinda question. Some general points:
NoSQL is typically good for unstructured/"schemaless" data - usually, you don't need to explicitly define your schema up front and can just include new fields without any ceremony
NoSQL typically favours a denormalised schema d...
.gitignore for Visual Studio Projects and Solutions
....build.csdef
# Windows Store app package directory
AppPackages/
# Others
sql/
*.Cache
ClientBin/
[Ss]tyle[Cc]op.*
~$*
*~
*.dbmdl
*.dbproj.schemaview
*.pfx
*.publishsettings
node_modules/
# RIA/Silverlight projects
Generated_Code/
# Backup & report files from converting an old project file
# ...