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What are the differences between segment trees, interval trees, binary indexed trees and range trees
...n add anything to Lior's answer, but it seems like it could do with a good table.
One Dimension
k is the number of reported results
| | Segment | Interval | Range | Indexed |
|--------------|--------------:|-----------:|---------------:|----------:|
|Preprocessing ...
Pandas: drop a level from a multi-level column index?
...unction does not work. Work through several and learn that ‘a’ in your table is columns name and ‘b’, ‘c’ are index. Do like this will help
df.columns.name = None
df.reset_index() #make index become label
share...
Interface or an Abstract Class: which one to use?
...along a particular path. Other times it would be bad. Imagine if PHP's Countable and Iterator interfaces were abstract classes instead of interfaces.
One approach that's common when you're uncertain which way to go (as mentioned by cletus below) is to create an interface, and then have your abstr...
How do I query between two dates using MySQL?
...
Your query should have date as
select * from table between `lowerdate` and `upperdate`
try
SELECT * FROM `objects`
WHERE (date_field BETWEEN '2010-01-30 14:15:55' AND '2010-09-29 10:15:55')
...
When to use SELECT … FOR UPDATE?
...
The only portable way to achieve consistency between rooms and tags and making sure rooms are never returned after they had been deleted is locking them with SELECT FOR UPDATE.
However in some systems locking is a side effect of concurr...
MySQL主从服务器数据一致性的核对与修复 - 数据库(内核) - 清泛网 - 专注C/...
...一天被掩盖的问题会再次爆发出来。
Percona Toolkit里的pt-table-checksum和pt-table-sync可以搞定此类问题。它们的安装很简单，可以依照自己的操作系统选择下载rpm或者deb软件包来安装，当然也可以使用源代码来安装，不过要注意的是...
How to declare variable and use it in the same Oracle SQL script?
...or
DEFINE stupidvar = 'stupidvarcontent';
SELECT stupiddata
FROM stupidtable
WHERE stupidcolumn = '&stupidvar'
upd:
SQL*Plus: Release 10.2.0.1.0 - Production on Wed Aug 25 17:13:26 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> conn od/od@etalon
Connected.
SQL>...
how do I query sql for a latest record date for each user
I have a table that is a collection entries as to when a user was logged on.
22 Answers
...
selecting unique values from a column
I have a MySQL table which contains the following type of information:
9 Answers
9
...
How to get innerHTML of DOMNode?
...se;
$dom->formatOutput = true;
$dom->load($html_string);
$domTables = $dom->getElementsByTagName("table");
// Iterate over DOMNodeList (Implements Traversable)
foreach ($domTables as $table)
{
echo DOMinnerHTML($table);
}
?>
...