大约有 13,000 项符合查询结果（耗时：0.0185秒） [XML]
LISTAGG in Oracle to return distinct values
... to 4000. Thanks to this post here by user3465996
select col1 ,
dbms_xmlgen.convert( -- HTML decode
dbms_lob.substr( -- limit size to 4000 chars
ltrim( -- remove leading commas
REGEXP_REPLACE(REPLACE(
REPLACE(
XMLAGG(
XMLELEMENT("A",col2 )
...
When to use Hadoop, HBase, Hive and Pig?
...-structured: Data is not strictly structured but have some structure. e.g. XML files.
Depending on type of data to be processed, we have to choose right technology.
Some more projects, which are part of Hadoop:
HBase™: A scalable, distributed database that supports structured data storage fo...
How do I create and access the global variables in Groovy?
...anguages, Groovy has no concept of "global" by itself (unlike, say, BASIC, Python or Perl).
If you have several methods that need to share the same variable, use a field:
class Foo {
def a;
def foo() {
a = 1;
}
def bar() {
print a;
}
}
...
How to force HTTPS using a web.config file
...t will force HTTPS for ALL resources (using 301 Permanent Redirect):
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<rewrite>
<rules>
<clear />
<rule name="Redirect to https" st...
A semantics for Bash scripts?
...ell is implemented. Here's an implementation I did as an exercise. It's in Python, but I hope that's not a hangup for anyone. It's not terribly robust, but it is instructive:
#!/usr/bin/env python
from __future__ import print_function
import os, sys
'''Hacky barebones shell.'''
try:
input=raw_...
Strange SQLAlchemy error message: TypeError: 'dict' object does not support indexing
...
You have to give %% to use it as % because % in python is use as string formatting so when you write single % its assume that you are going to replace some value with this.
So when you want to place single % in string with query allways place double %.
...
Sublime Text 3, convert spaces to tabs
...
To automatically convert spaces to tabs on save, add the following Python script to a newly created subfolder called "UnexpandTabsOnSave" within "$SUBLIME_HOME$\Packages\":
import sublime, sublime_plugin, os
class ConvertSpacesToTabsOnSave( sublime_plugin.EventListener ):
# Run Sublime's...
What is the best practice for “Copy Local” and with project references?
...ect file to look like the following:
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
... snip ...
</ItemGroup>
<Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
<Import Project="[rela...
How to turn on front flash light programmatically in Android?
...simple Three Steps.
I just added Camera and Flash Permission in Manifest.xml file
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.FLASHLIGHT"/>
<uses-feat...
SQL Server SELECT into existing table
...identity <> 1
ORDER BY SYSCOL1.object_id
FOR XML PATH ('')
), 2, 1000)
FROM
sys.columns SYSCOL2
WHERE
SYSCOL2.object_id = object_id('dbo.TableOne') )
SET @SQL_INSERT = 'INSERT INTO dbo.TableTwo SELECT ' + @COLUMN_LIST + ' FROM dbo.TableOne table1 WHERE...