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What does mysql error 1025 (HY000): Error on rename of './foo' (errorno: 150) mean?
I tried this in mysql:
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CentOS 6.4下Squid代理服务器的安装与配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...户申请同样的页面时，Squid 把保存的备份立即传给用户，使用户觉得速度相当快。Squid 可以代理HTTP、FTP、GOPHER、SSL和WAIS等协议并且Squid 可以自动地进行处理，可以根据自己的需要设置Squid，使之过滤掉不想要的东西。
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SQL to determine minimum sequential days of access?
... 0) This works by subtracting the supplied date from zero--which Microsoft SQL Server interprets as 1900-01-01 00:00:00 and gives the number of days. This value is then re-added to the zero date yielding the same date with the time truncated.
– IDisposable
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What does inverse_of do? What SQL does it generate?
...cumentation, it seems like the :inverse_of option is a method for avoiding SQL queries, not generating them. It's a hint to ActiveRecord to use already loaded data instead of fetching it again through a relationship.
Their example:
class Dungeon < ActiveRecord::Base
has_many :traps, :inverse_...
How to query MongoDB with “like”?
I want to query something with SQL's like query:
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Which SQL query is faster? Filter on Join criteria or Where clause?
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For inner joins it doesn't matter where you put your criteria. The SQL compiler will transform both into an execution plan in which the filtering occurs below the join (ie. as if the filter expressions appears is in the join condition).
Outer joins are a different matter, since the place of...
SQL Server CTE and recursion example
...eading an article on it. This article shows employee info with the help of Sql server CTE and recursion. It is basically showing employees and their manager info. I am not able to understand how this query works. Here is the query:
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SELECT * FROM X WHERE id IN (…) with Dapper ORM
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Dapper supports this directly. For example...
string sql = "SELECT * FROM SomeTable WHERE id IN @ids"
var results = conn.Query(sql, new { ids = new[] { 1, 2, 3, 4, 5 }});
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How to compare only Date without Time in DateTime types in Linq to SQL with Entity Framework?
Is there a way to compare two DateTime variables in Linq2Sql but to disregard the Time part.
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SQL Server equivalent to MySQL enum data type?
Does SQL Server 2008 have a a data-type like MySQL's enum ?
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