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Oracle Dual table details

then used by other database users in the form of public synonym.SQL> select owner, object_name, object_type from dba_objects where object_name like ''% DUAL % '';OWNER OBJECT_NAME OBJECT_TYPE---------------------------------------------SYS DUAL TABLEPUBLIC DUAL SYNONYM-- View the table structure. There is only one field DUMMY, which is of the VARCHAR2 (1) type.SQL> desc dualName Type Nullable Default Comments---------------------------------------

Integration of apahe and tomcat in Linux

above two lines in http. conf without adding them. For a VM, if it is a JSP, add others without adding Example: Vi/usr/local/apache/conf/http. conf Put: # Include conf/extra/httpd-vhosts.conf Save without comments Then vi/usr/local/apache/conf/extra/httpd-vhosts.conf Reference: NameVirtualHost: 80 # # VirtualHost example: # Almost any Apache directive may go into a VirtualHost container. # The first VirtualHost section is used for all requests that do not # Match a ServerName or ServerA

Apache+openssl set up HTTPS one-way authentication and bidirectional authentication and reverse proxy

/apache/conf/extra--Turn on SSL service Sslengine on--turn on client authenticationSslcacertificatefile "/usr/local/apache/conf/ca.cerSslverifyclient requireSslverifydepth 10--Open service-side authenticationSslcertificatefile "/usr/local/apache/conf/server.cerSslcertificatekeyfile "/usr/local/apache/conf/server.key.2048 setting up a reverse proxyCd/usr/local/apache/confVim httpd.conf#设置httpd. conf inside the monitor portListen XX (the port you need to listen to)#如果是根据上面的步骤进行编译安装apache, then t

Install Snap app to Ubuntu 16.4 desktop system

X1 Devmodesnaptest-app 1 x3 devmodeubuntu-calculator-app 2.1+snap3 5 Ubuntucoredev -ubuntu-core 16.04+20160531.11-56 122 canonical -webcam-webui 1 X1 -Above, we see that the Ubuntu-calculator-app application has been installed. We can delete it by using the following method.[Email protec

Linux Source organization

drivers is SCSI, USB, and FireWire. Some drivers may is more difficult to find. For instance, joystick drivers is not in a joystick folder. Instead, they is under./drivers/input/joystick. Keyboard and mouse drivers is also located in the input folder. The Macintosh folder contains code for hardware made by Apple. The Xen folder contains code for the Xen hypervisor. A hypervisor is software or hardware this allows users to run multiple operating systems on a single computer. This means, the Xen

IP Camera Network Camera how to set up

informational prompt that includes some of the default items. At the bottom, there is an IP network camera, the "IP network Camera" entry. Step 4th-Access your IP webcam in the Internet After the router's port forwarding is configured, we can access the network camera over the network. It is recommended that you try to access your webcam at a remote location, not just to verify that the port is forwardin

Configure virtual host with Wamp on winserver2008, Access _php tutorial with extranet domain name

winserver2008 all kinds of toss Ah, on the winserver configuration Wamp 2.2e Various can not run, reported Crashapp error, Engaged for a long time did not solve, there is no big God guidance, and then under a Wamp 2a can be installed, but his PHP version is 5.2, and so on to upgrade the PHP version, at least a 5.3 ah! Specific installation failure and upgrade PHP version of the issue in the next article, write about the Apache and server configuration issues. First: The domain name is resolved

An interesting question about GC and destructor

This interesting question thanks to the Assembly head Friendship offers.Take a look at the following code: Public class Dummy { publicstatic Dummy Instance; Public int 1 ; ~Dummy () { this; } }The call is made by the following code (where I adjust the output log): Task.run (() =>{ var d = new

QT signal and slot on which thread is executing the problem

: Qthread object attached to sub-line approached (via Movetothread) Slots and signals are directly connected, and the signal is emitted in the secondary thread But the last two solutions are not good, because qthread is not so used (Bradley t.hughes) OK, no more text to add, look at the code, I guess we'll be easy.Main thread (signal) Qthread (slot)This is a commonly used method in Qt Manual and examples. But since manual does not say that the slot function is exe

Dual usage in Oracle

Label:Basically, Oracle introduced dual as a syntax-compliant1. We start with the name, dual is not an abbreviation, itself is the complete word. Dual noun means logarithm, when doing adjectives refers to two heavy, two yuan.2. The dual table in Oracle is a single-row, single-column virtual table.3. The dual table is a table that Oracle automatically creates with the data dictionary, which has only 1 columns: DUMMY, the data type is VERCHAR2 (1), and

"Leetcode Problem Solving Report" single-linked list sorting problems

leetcode Merge Sorted ListsProblem descriptionMerge sorted linked lists and return it as a new list. The new list should is made by splicing together the nodes of the first of the lists.Analysis and SolutionThere is not much explanation for this problem, direct merging; look at the code:1 /**2 * Definition for singly-linked list.3 * struct ListNode4 * {5 * int val;6 * ListNode *next;7 * ListNode (int x): Val (x), Next (NULL) {}8 * };9 */Ten classSolution One { A Public: -listnode* mergetwoli

C + + interface Implementation and separation (reprint)

---------------------------#include "Interface1.h"DATA::D ata (){_i = _j = 0;}Data::~data (){_i = _j = 0;}void Data::set (int i, short j){_i = i;_j = j;}void Data::get (int* i, short* j){*i = _i;*j = _j;}---------------------------Test.cpp---------------------------#include #include "Interface1.h"int main (){Data data;int i;Short J;Data.set (2, 3);Data.get (i, j);printf ("I =%d, j =%d\n", I, j);return 0;}Let's look at C how to cleverly package and hide implementation Details:--------------------

[Leetcode] 2. Add two numbers add the two numbers stored in reverse order of the list

= L2? L2->val:0; intsum = n1 + N2 +carry; Carry= SUM/Ten; Cur->next =NewListNode (sum%Ten); Cur= cur->Next; if(l1) L1 = l1->Next; if(L2) L2 = l2->Next; } if(carry) Cur->next =NewListNode (1); returnRes->Next; }};On the careercup of the problem there is a follow up, the number of the linked list of the direction of change, the original is the lowest table head, now is the highest position of the table head. It's a little bit troublesome. One idea is that since the numbers are in the oppos

Apache sets the virtual path for MySQL and its own project _linux

multiviews # # that ' MultiViews ' must be named *explicitly*---' Options all ' # doesn ' t give it to you. # # The Options directive is both complicated and important. Please # http://httpd.apache.org/docs/2.2/mod/core.html#options # for more information. # Options Indexes FollowSymLinks # # AllowOverride Controls What directives may is placed in. htaccess files. # It can be ' all ', ' None ', or any combination of the keywords: # Options FileInfo authconfig Limit # AllowOverride None # # Cont

LAMP Four Discuz Forum Construction (example)

the previous #)After opening the virtual host, enter the configuration file[Email protected] www]# vim/usr/local/apache2/conf/extra/httpd-vhosts.confSee the following configuration file. Delete the bottom-most example.# use name-based virtual hosting.#Namevirtualhost *:80## VirtualHost Example:# Almost any Apache directive could go into a VirtualHost container.# The first VirtualHost section was used for all requests and that does not# match a ServerName or Serveralias in any #ServerAdmin [emai

Run Apache + PHP + MySQL in MacOSX

" indicates that the MCrypt extension library has been successfully installed.Set VM On the terminalRun"sudo vi /etc/apache2/httpd.confOpen the Apche configuration file. In httpd. conf, find"#Include /private/etc/apache2/extra/httpd-vhosts.conf", Remove the previous" # ", save and exit. Run"Sudo apachectl restart". After Apache is restarted, its VM configuration function is enabled. Run"Sudo vi/etc/apache2/extra/httpd-vhosts.conf" opens the file httpd-vhost.conf for configuring the VM and c

[ORACLE] Explain the oracle dual table

other database users in the form of public synonym. SQL> select owner, object_name, object_type from dba_objects where object_name like '% dual % '; Owner object_name object_type --------------------------------------------- Sys dual table Public dual synonym -- view the table structure. There is only one field DUMMY, In the VARCHAR2 (1) type. SQL> desc dual Name Type Nullable Default Comments ---------------------------------------

Logistic Regression-Logistic Regression algorithm summary **

requires the concept of MLE and optimization algorithm for maximum likelihood estimation. We regard the sigmoid function as the probability density function of the sample data. each sample point can be calculated using the formula ① and ② above. Detailed description 1. Logic Back Gui Model 1.1 Logistic Regression Model Consider vectors with p independent variables, and set the conditional probability to the probability of occurrence of an event based on the observed amount. The logistic regre

Serial Wire Debug (SWD) Interface--PSOC5

PSoC 5 supports programming through the serial Wire debug (SWD) interface.There is signals in SWD interface:data signal (swdio) and a clock for data signal (SWDCK).The host programmer always drives the clock line, whereas either the programmer or the PSoC 5 device drives the data line.The timing diagram for the SWD protocol are given in programming specifications chapter on page 29.Host Programmer and PSoC 5 device communicate in packet format through the SWD interface.Write packet refers to the

Configure the Apache server on your Mac

default to two virtual hosts as an example (the following is a virtual host example): the>ServerAdmin [email protected]-host.example.com DocumentRoot"/usr/docs/dummy-host.example.com"ServerName Dummy-host.example.com errorlog"/private/var/log/apache2/dummy-host.example.com-error_log"Customlog"/private/var/log/apache2/dummy

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