大约有 6,000 项符合查询结果(耗时:0.0245秒) [XML]

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Strange SQLAlchemy error message: TypeError: 'dict' object does not support indexing

I am using hand crafted SQL to fetch data from a PG database, using SqlAlchemy. I am trying a query which contains the SQL like operator '%' and that seems to throw SqlAlcjhemy through a loop: ...
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为什么我们程序员写不出好代码? - 杂谈 - 清泛网 - 专注C/C++及内核技术

...程序员则需要图书馆般那种安静的环境。虽然许多企业给包括程序员在内的员工提供了类似乒乓球这类的运动,但他们常常忘记,程序员需要在安静的环境下办公,否则,嘈杂的环境很容易分散程序员的注意力。 13.办公文化 ...
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Cannot resolve the collation conflict between “SQL_Latin1_General_CP1_CI_AS” and “Latin1_General_CI_

...ith (as follows): DECLARE @Table TABLE (CompareMessage VARCHAR(50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL) – FrostbiteXIII Jun 23 '14 at 10:57 1 ...
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Altering a column to be nullable

... Assuming SQL Server (based on your previous questions): ALTER TABLE Merchant_Pending_Functions ALTER COLUMN NumberOfLocations INT NULL Replace INT with your actual datatype. ...
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SQL SERVER: Get total days between two dates

... SQL Server DateDiff DECLARE @startdate datetime2 = '2007-05-05 12:10:09.3312722'; DECLARE @enddate datetime2 = '2009-05-04 12:10:09.3312722'; SELECT DATEDIFF(day, @startdate, @enddate); ...
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MySql export schema without data

I'm using a MySql database with a Java program, now I want to give the program to somebody else. 13 Answers ...
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Plsqldev SQL含中文查无结果 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术

Plsqldev SQL含中文查无结果设置环境变量:NLS_LANG值为:SIMPLIFIED CHINESE_CHINA.ZHS16GBK设置环境变量:NLS_LANG 值为:SIMPLIFIED CHINESE_CHINA.ZHS16GBKPlsqldev 中文 无结果
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卸载SQL Server2000后不能再次安装的问题解决方法 - 爬虫/数据库 - 清泛IT...

曾经由于磁盘空间的问题,卸载了SQL Server2000,可当再次要把它安装上的时候,却怎么也不行了。无论是安装哪一个版本,永远都是同样的错误提示,说是有一个文件已经挂起,必须重新启动计算机。那okay啦,重新启动,再次安...
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常用Sql - 爬虫/数据库 - 清泛IT社区,为创新赋能!

本帖最后由 zqp2013 于 2015-3-17 22:06 编辑 mysql:drop table if exists tablename; 不能写成 drop table tablename if exists tablename; mysql:建立索引Sql CREATE TABLE tablename (   `ID`                 &nbs...
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Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...撑的连接数个数,而并非qps,当然qps也是我们需要考虑的性能点之一。这种应用常见于消息推送系统,也称为comet应用,比如聊天室或即时消息推送系统等。comet应用具体可见我之前的介绍,在此不多讲。对于这类系统,因为很...