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...337 -j DROP
有些些特洛伊木马会扫描端口31337到31340(即黑客语言中的 elite 端口)上的服务。既然合法服务都不使用这些非标准端口来通信,阻塞这些端口能够有效地减少你的网络上可能被感染的机器和它们的远程主服务器进行独立通...
What are the options for storing hierarchical data in a relational database? [closed]
...the new method and get a copy of the code at the following URL.
http://www.sqlservercentral.com/articles/Hierarchy/94040/
I also developed a "pre-aggregated" hierarchy using similar methods. MLM'ers and people making bills of materials will be particularly interested in this article.
http://www.sq...
How to delete an object by id with entity framework
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It doesn't work with Azure SQL DataWarehouse due to error "A FROM clause is currently not supported in a DELETE statement.". But the raw SQL as in Jonik's answer works.
– Michael Freidgeim
Sep 8 '16 at 11:34
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What is Turing Complete?
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SQL is most definitely turing-complete. It has scripting capabilities that allow for any computation.
– nzifnab
May 1 '11 at 0:41
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How to recover MySQL database from .myd, .myi, .frm files
How to restore one of my MySQL databases from .myd , .myi , .frm files?
11 Answers
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delegate keyword vs. lambda notation
...with delegates (such as System.Func) uses System.Linq.Enumerable. Linq to SQL (and anything else) with expressions uses System.Linq.Queryable. Check out the parameters on those methods.
An Explanation from ScottGu. In a nutshell, Linq in-memory will produce some anonymous methods to resolve your ...
How can I escape square brackets in a LIKE clause?
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I corrected the other part of the answer too. SQL Fiddle with before and after versions
– Martin Smith
Oct 31 '12 at 22:20
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Why is LINQ JOIN so much faster than linking with WHERE?
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Your first approach (SQL query in the DB) is quite efficient because the DB knows how to perform a join. But it doesn't really make sense to compare it with the other approaches, since they work directly in memory (Linq to DataSet)
The query with...
ORA-30926: unable to get a stable set of rows in the source tables
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and watch for .trc files in UDUMP when it occurs.
2) Having found the SQL statement, check if it is correct (perhaps using explain plan or tkprof to check the query execution plan) and analyze or compute statistics on the tables concerned if this has not recently been done. Rebuilding (or dropp...
Data access object (DAO) in Java
... have to provide a concrete implementation for that interface to deal with SQL server, and another to deal with flat files, etc.
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