, the example: -------------------------------------------------A table ID name B table ID job parent_id1 Sheets 3 1 23 12 Lee 42 34 23 Wang Wu 3 34 4Relationship between a.ID and parent_id --------------------------------------------------1) Internal connectionSelect a.*,b.* from a inner join B on a.id=b.parent_idThe result is1 Sheets 3 1 23 12 Lee 42 34 2 2) Left ConnectionSelect a.*,b.* from a LEFT join B on a.id=b.parent_idThe result is1 Sheets 3 1 23 12 Lee 42 34 23 Wang Wu null 3)
Nov 3 19:31:35 FQHY_DEVLP sshd[8195]: Server listening on 0.0.0.0 Port 22.136 Nov 3 19:31:47 FQHY_DEVLP sshd[8206]: Refused connect from 101.254.207.4 (101.254.207.4)137 Nov 3 19:43:21 FQHY_DEVLP sshd[8576]: Refused connect from 101.254.207.4 (101.254.207.4)138 Nov 3 19:43:52 FQHY_DEVLP sshd[8602]: Refused connect from 101.254.207.4 (101.254.207.4)139 Nov 3 19:44:36 FQHY_DEVLP sshd[8648]: Accepted password for yuanwz from 101.254.207.4 Port 52700 ssh23 19:44:36 FQHY_DEVLP sshd[8648]: Pam_unix (s
machine's Win7 platform to connect Debian, the results found unable to connect, did not report any errors, at first suspected port problems, modify the port is not yet, because it is the Debian system, I uninstalled the firewall directly, so also ruled out the firewall factors.After a long day, only to find that the original ends of the Nomachine version is not the same. A low version of Nomachine does not properly connect to a higher version of Nomachine.After reinstalling the Win7 Nomachine,
entry, right click on the disabled mobile phone driver, select the "Enable" item.
5, when the above methods can not solve the problem of mobile phone connected to the computer, we can use the "trend to USB monitoring" software to achieve problem solving.
6, in the Open Program main interface, check the "Disable USB storage Device" item, the disabled operation of this item does not affect the normal use of computer mouse and keyboard.
1th step: First of all, the network operators provide access to the Internet cable plug in the WAN, and then a few share the computer connected to the LAN port, and then use a computer login router management interface for the corresponding configuration can be completed sharing the Internet.
2nd step: The router's WAN port does not pick up the network cable or network cable is not good.
3rd Step: The router's WAN port rate problem.
4th Step: Netwo
Method One:
1, open the introduction, and then open the Control Panel, network and Sharing Center options. Of course, you can also right click on the lower right of the wireless network connection icon, and then select the inside of the "Network and Sharing Center" to open it;
2, click the current connection of the wireless name;
3, this time will appear an interface, selected inside the "Wireless properties" option;
4, finally open the "Security" tab, the "Display chara
Failure diagram:
Reason Analysis:
There may be a long time no charge, resulting in the battery's internal power consumption after the loss of serious electricity, but the protection of computer recharge, not to allow overcharge just, as long as the battery options can generally solve the problem.
Workaround:
1, shut down the machine, unplug the power, unplug the battery, plug in the power, and then boot;
2, and then shut down, unplug the power, and then put the battery, plug in t
Win7 System network connection is actually very convenient, in the lower right corner to open the menu to choose a network connection, then we sometimes do not connect to the network how to do? The small number of the system gives you several common solutions. For line networks only.
Method/Step
1. First look at the lower right corner of the icon, like the above connection is normal, if the error can check the user name and password is incorrect or expired. and icons like the one b
How to set up a computer after the phone is connected to cancel the automatic pop-up Kingsoft mobile phone assistant? if we need to manage our mobile files on our computers, we often do it through our phone assistants. Some users in the computer to connect the mobile phone, will automatically pop-up Kingsoft mobile assistant, but many times just want to charge the phone in the computer, in this case always need to manually close the phone assistant is
Method One
1, with a good data cable to connect the mobile phone, open 360 mobile phone assistant
2, the phone is not connected at the same time prompted to open a USB connection
3, mobile phone-side open Settings-Find the USB debugging options (individual mobile phone will be different, generally in the developer option)
4, the computer end in the election has been opened
5, will soon see, connecti
Win7 Computer connected to HP printer after the file printing does not come out how to do
Workaround One:
1, open the Control Panel-printer interface;
2, right click on the printer to remove it;
3, if not selected any of the current printer, the menu is such;
4, select any one of the printers, select Print Server properties;
5, print server properties, switch to the driver i
360 free WiFi not connected to how to solve? 360 security defender The latest version of the 360 free WiFi, but some friends in the course of the use of the 360 free WiFi connection problem, how to solve it? The following small series to teach everyone 360 free WiFi connection is not a solution, If you also encounter this problem, and small weave together to see below.
360 Free WiFi doesn't even work:
Win7 above operating system
Make sure that you
Why can't the notebook be connected to the wireless network
1, first consider the notebook wireless network hardware switch, and some notebook models have this switch, if it is in the closed state, no matter how the setting can not use wireless network function, so first of all to ensure that the switch is open;
2, second, almost all notebooks provide the FN key combination to control the wireless switch, as well, if the combination of t
Wireless Internet is the most disturbing is the network limited situation, the wireless network may connect, the signal is also very good, is not on the net. The signal on the wireless network has a yellow exclamation mark on it, but it's not on the net. In fact, this problem for the wireless network is still very common, the cause of this problem are many, the following on the author of the maintenance of the computer common in several cases to troubleshoot the wireless network can be
In many cases, the local area network has a shared printer, but the inexplicable search is not connected, or search to the connection when the target printer does not exist, and so on, the following is the resolution of the steps OH
Steps/Methods
Take the Win7 system as an example:
(1) Control Panel-management tools-Component Services-services (local), there is a service named Computer browser in the right-hand list
(2) Select this service to firs
Today, look at the movie with Thunder, the results of half after looking at the restart of the computer, and then the connection appeared "temporarily connected to the server" problem, but see the film is still normal, how to do?
I searched for a few ways to find a solution:
1, open operation, in the operation of the input of the following command statement: regsvr32 c:windowssystem32wmnetmgr.dll, click OK, if the operation succeeds, will pop up a d
How to realize the connection of two different types of routers to connect the Internet? This article explains how to connect to a wireless router from a wired router to enable wireless Internet access.
First, the first scenario is introduced, which connects the wireless router's WAN port to the LAN port of the wired router. Disconnect the wireless and wired routers first, and then make sure that one of the routers is 192.168.1.1 and logged in. Click on the LAN port settings in the netwo
What to do if a laptop is connected to a wireless network
Reboot the router to prevent this from occurring because of a router shutdown.
Start checking your computer when there is no problem with the router. Click the "Start" button in the lower-left corner of the desktop. Right-click on "Properties" after entering the start program.
Click on the network at the network connection.
Click on the wireless properties of the network.
Mobile phone connected notebook sharing network do not have a network what to do
Open the computer's control panel, find the network and the Internet, click on it;
Click on the network and Sharing center;
Click the change adapter settings on the left;
Right-click on the local connection, click on the properties;
Click on the Sharing tab, check to allow other network users to connect through this computer's Internet lin
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