大约有 3,620 项符合查询结果（耗时：0.0211秒） [XML]
Alternate output format for psql
I am using PostgreSQL 8.4 on Ubuntu. I have a table with columns c1 through cN . The columns are wide enough that selecting all columns causes a row of query results to wrap multiple times. Consequently, the output is hard to read.
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CodeIgniter: Create new helper?
...n(){
$ci=& get_instance();
$ci->load->database();
$sql = "select * from table";
$query = $ci->db->query($sql);
$row = $query->result();
}
share
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improve t...
How to get next/previous record in MySQL?
...ng that a primary key colum is not meant as a column to sort by, because MySQL does not guarantee that higher, auto incremented, values are necessarily added at a later time.
If you don't care about this, and simply need the record with a higher (or lower) id then this will suffice. Just don't use ...
How to round an average to 2 decimal places in PostgreSQL?
I am using PostgreSQL via the Ruby gem 'sequel'.
8 Answers
8
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新浪是如何分析处理32亿条实时日志的？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...难度大。
我们起初采用官方Kibana v3，用户提出的类似SQL中的多个group by，画百分比，求指定区间占比等常见需求无法满足。之后通过三斗大神(微博@argv)定制版的Kibana 3满足了一些用户需求。Kibana 4诞生后，代码几乎是对Kibana3的...
What is the best collation to use for MySQL with PHP? [closed]
I'm wondering if there is a "best" choice for collation in MySQL for a general website where you aren't 100% sure of what will be entered? I understand that all the encodings should be the same, such as MySQL, Apache, the HTML and anything inside PHP.
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Foreign Key to multiple tables
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I am really new to SQL so correct me if this is wrong, but this design seems to be an approach to use when you are extremely confident that you will only need two owner types of a ticket. Down the road if a third ticket owner type were introduc...
Replace Line Breaks in a String C#
...actual newlines may not match. This happened to me why processing returned SQL. The new lines were \n, while Environment.NewLine was \r\n. The result was that nothing was matched so the new lines remained.
– Dono
Oct 2 '13 at 3:06
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Fluent and Query Expression — Is there any benefit(s) of one over other?
...th worlds by mixing query and method syntax. This is often done in LINQ to SQL queries:
var query =
from c in db.Customers
let totalSpend = c.Purchases.Sum (p => p.Price) // Method syntax here
where totalSpend > 1000
from p in c.Purchases
select new { p.Description, totalSpend, c...
搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
...可扩展性和高可用性这些难题。不过就是因为这些问题Nosql诞生了。
NOSQL有这些优势：
大数据量，可以通过廉价服务器存储大量的数据，轻松摆脱传统mysql单表存储量级限制。
高扩展性，Nosql去掉了关系数据库的关系型特性，...