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CREATE TABLE IF NOT EXISTS equivalent in SQL Server [duplicate]

CREATE TABLE IF NOT EXISTS works on mysql but fails with SQL Server 2008 R2. What is the equivalent syntax? 1 Answer ...
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Difference between datetime and timestamp in sqlserver? [duplicate]

... by database system?im sorry im new to server side programming. i am using mysql sa database and now i am using xampp as my local host. – Brownman Revival May 19 '15 at 6:32 ...
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Remove duplicate entries using a Bash script [duplicate]

...s. Interestingly enough the same record set took 15.1 seconds to perform a MySQL DISTINCT query on. – Tegan Snyder Feb 11 '16 at 19:13 1 ...
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Is there a way to “limit” the result with ELOQUENT ORM of Laravel?

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Apache not starting on MAMP Pro

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千万别惹程序员 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术

...一些精细的调优工作,明显不行。这和Ruby很像。 PHP没有MySQL,明显是被幽默了一把。不过最近对PHP的批评越来越多,不过,facebook的PHP的引擎HiPo已经很牛B了。 Perl是一本日本武士刀,是忍者玩的语言。 VB,就是一个玩具。你...
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记一次数据库表自增长(Auto Increment)故障 - 数据库(内核) - 清泛网 - ...

...EMENT = 123; 此方法无疑能够达到目的,但有一个缺点:在 MySQL 中,当 ALTER 一个表时,实际上相当于重新创建了一次表!如果原本数据就很大的话,这个过程将非常缓慢。 让我们再来考虑考虑其它方法,既然问题出在唯一标识的...
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TokuMX vs. MongoDB 性能对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...占用也比MongoDB少10%左右)。这种思路不稀奇,5.x版本的MySQL,如果设定file_format为Barracuda,也可以直接对表做压缩,同时不影响外部操作;提高写入速度则值得一提,原来TokuMX的做法是使用 分形树索引(Fractal Tree Index) ,替代...
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PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...需要Map和Reduce两步即可,这里有一个PDF文档生动的说明了MySQL中GROUP BY和MongoDB中MapReduce的对应关系: SQL to MongoDB 此外,还有很多资料可供参考,如:MongoDB Aggregation III: Map-Reduce Basics。 说明:软件版本为MongoDB 1.6.5,PECL Mongo 1...
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在MongoDB中模拟Auto Increment - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

在MongoDB中模拟Auto IncrementMySQL用户多半都有Auto Increment情结,不过MongoDB缺省并没有实现,所以需要模拟一下,编程语言以PHP为例,代码大致如下所示:<?phpfunct...MySQL用户多半都有Auto Increment情结,不过MongoDB缺省并没有实现,所以...