大约有 40,000 项符合查询结果（耗时：0.0334秒） [XML]
How do I list all the columns in a table?
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For Oracle (PL/SQL)
SELECT column_name
FROM user_tab_cols
WHERE table_name = 'myTableName'
For MySQL
SHOW COLUMNS FROM table_name
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MySQL InnoDB not releasing disk space after deleting data rows from table
... recreate your table and regain diskspace
Create TBL_B like TBL_A . Insert select data you want to keep from TBL_A into TBL_B. Drop TBL_A, and rename TBL_B to TBL_A. This way is very effective if TBL_A and data that needed to delete is big (delete command in MySQL innodb is very bad performance)
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How to find elements by class
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CSS selectors
single class first match
soup.select_one('.stylelistrow')
list of matches
soup.select('.stylelistrow')
compound class (i.e. AND another class)
soup.select_one('.stylelistrow.otherclassname')
soup.select('.st...
How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
...le expression that returns these two dictionaries, merged (i.e. taking the union). The update() method would be what I need, if it returned its result instead of modifying a dictionary in-place.
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Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...option, enabled by default.
When address of packed member of struct or union is taken, it may
result in an unaligned pointer value. This patch adds
-Waddress-of-packed-member to check alignment at pointer assignment and warn unaligned address as well as unaligned pointer
I've just built t...
Add 2 hours to current time in MySQL?
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SELECT *
FROM courses
WHERE DATE_ADD(NOW(), INTERVAL 2 HOUR) > start_time
See Date and Time Functions for other date/time manipulation.
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How do I pass JavaScript variables to PHP?
...larieids">SalarieID:</label>
<?php
$query = "SELECT * FROM salarie";
$result = mysql_query($query);
if ($result) :
?>
<select id="salarieids" name="salarieid">
<?php
while ($row = mysql_fetch_assoc($r...
C#操作XML小结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Server.MapPath("~/file/bookstore.xml"));
二、具体实例
在C#.net中如何操作XML需要添加的命名空间：
using System.Xml;
定义几个公共对象：
XmlDocument xmldoc;
XmlNode xmlnode;
XmlElement xmlelem;
1，创建到服务器同名目录下的xml文件：
方法一：
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How to escape apostrophe (') in MySql?
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Here's an example:
SELECT * FROM pubs WHERE name LIKE "%John's%"
Just use double quotes to enclose the single quote.
If you insist in using single quotes (and the need to escape the character):
SELECT * FROM pubs WHERE name LIKE '%John\'s%'...
MySQL DISTINCT on a GROUP_CONCAT()
I am doing SELECT GROUP_CONCAT(categories SEPARATOR ' ') FROM table . Sample data below:
6 Answers
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