returns the ID of the course.
Returns the ID of the selected primary course.The simple idea is to execute two different SQL statements for query.Condition 1
-- Condition 1: only students who have selected one course
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->SELECT std_id, MAX(class_id) AS main_classFROM StudentclassGROUP BY std_idHAVING COUNT(*) = 1;Execution result 1
Code highlighting produced by Actipro Code
shared_pool_reserved_size#1. if the system has a ora-04031, it is found that the request memory is greater than _ shared_pool_reserved_min_alloc (default 10gr2 4400), and V $ shared_pool_reserved has a large number of request_misses (and you can see last) it indicates that the shared_pool_reserved_size is too small and the request that requires a large memory fails. Therefore, you need to increase the shared_pool_reserved_size.#2. If the ora-04031 re
[Android L] About Android L Service Startup, androidservice
I. Problem Description
When Android L [Android5.X. X] implicitly starts the service through Intent, the following error is reported:
AndroidRuntime (792): java. lang. IllegalArgumentException: Service Intent must be explicit
[Statement] Welcome to reprint, but please keep the original source of the article: http://blog.csdn.net/yelangjueqi/article/details/46754581
Details:
01-02 07:52:44. 736 D/PowerManagerService/SmartStandby (792):
main_classFrom studentclassGroup by std_idHaving count (*) = 1;
Execution result 1
Std_id main_class----------------300 4400 5500 6
Condition 2
-- Condition 2: Select multiple course studentsSelect std_id, class_id as main_classFrom studentclassWhere main_class_flg = 'y ';
Result 2
Std_id main_class----------------100 1200 3
If the case function is used, we only need one SQL statement to solve the problem, as shown below:
Select std_id,Case when coun
hundred times (How many times have I warned you .)
Thu.In science and technology articles, numbers frequently appear. It is more advantageous to use Arabic numbers than to use words.
The new engine has a capacity of 4.3 litres and a power output of 153 kilowatts at 4400 revolutions per minute.
The new engine has a capacity of 4.3 liters and a rotation speed of 4400 rpm, with an output power of 153 KW.
We k
13:24 6:53 [Chromium-browse] 1000 4400 0.0 0.0 0 0? Z October 0:00 [FCITX] 10871 0.0 0.0 0 0 PTS/4 z+ 22:32 0:00 [zombie] As can be seen from the above, there is a zombie process in the system. But if the parent process wakes up after waking up, we look at the system process information again and find that the zombie process is missing.[Email protected]:~/documents$./zombieIn the parent process, sleep for one miniute...zz ...In child process, and exi
Recently Acer has just launched the ultra-Haswell S7, which uses a new chip, but the vast majority of users have been disappointed by the Hu Hongyu choice to integrate the Intel HD 4400 (Haswell GT2) rather than the full HD 5000 (Haswell GT3). While HD 4400 has improved performance compared to the previous generation of HD 4000 (Ivy Bridge GT2), the performance of HD 5000 has been in some ways more sought-a
, suitable in a small room to watch movies or play music.
Keyboard feel
Zenbook Ux303la is equipped with a black keyboard that looks very similar to Apple. Luckily, it's not just the look and feel, so you can use the notebook to tap the text briskly and not feel very tired. The effect of the touchpad is equally impressive, the touch is smooth, the left and right keys respond quickly, and can provide a better sense of operation without using an external mouse.
Performance and heat
ATIV Q is a recent hybrid design by Samsung, from product design, configuration to function to give people a bright feeling. First, it has a unique reversible screen and ultra-thin fuselage, while the 13.3-inch screen also boasts stunning 3200*1800 resolution, with the latest Intel Haswell in the processor and the ability to run Windows 8.1 and Android simultaneously. These stunning features are tucked into a lightweight, slide-in body that is undoubtedly the most unique hybrid design computer o
the private network signaling or data. This means that, for example, at night, there is no voice traffic, and billing can be transmitted using the vast majority of bandwidth.
The problem of frame mode reuse is the delay and how to manage the priority of traffic, to overcome these problems, advanced switching nodes can take the following measures: Data frame segmentation, user data frame may be very long, when there is a very long frame to send, in order to avoid long delay, the long frame is d
multiple courses, return to the selected master course ID
The simple idea is to execute two different SQL statements to query.Condition 1--Condition 1: Only one course of students selected std_id, MAX (class_id) as Main_classfrom Studentclassgroup by Std_idhaving COUNT (*) = 1;Execution Results 1std_id main_class------ ---------- 4400 5500 6Condition 2-Condition 2: Select std_id for multiple courses, class_id as Main_classfrom
properties, click the Configure button, select Advanced, and select Network address in the left column properties (note: Some cards are called " The network address, some uses "network addresses", the Intel network card uses "locally administered address", certainly also some network card does not have this option), then selects the right column box "value" above one single option (not "does not exist"), At this point you can enter the box in the right to change the NIC MAC address, in the form
after this option. However, there are special circumstances, no matter how the modification has not this option, then how to do? Then look down, the following method can be said to be omnipotent!
Second, the Registration form modification method
Step 1th, click Start, select Run, and type "regedit" to bring up the registry.
The 2nd step, in hkey_local_machinesystemcurrentcontrolsetcontrolclass{4d36e972-e325-11ce-bfc1-08002be10318}000, 0001, 0002 Wait for the primary key, look for DriverDesc,
-tier switching technology, especially the three-tier switch, which enabled Ethernet switches to be the core of a large park network that could replace routers. These two technologies gradually become the network-led, routers retreat to the WAN edge, ATM simulation declared out.
4~7 Layer Exchange:
Three-layer switch quickly commercial, soon emerged the concept of 4~7 layer Exchange, initially defined as the switch on the network message application recognition and QOS/ACL intelligent processi
The 10-ge core switch is still quite common. So I studied the perfect design concept of the 10-ge core switch and shared it with you here. I hope it will be useful to you. Quidway S8500 series 10-Gigabit core switches are a new generation of high-performance 10-Gigabit core route switch independently developed by Huawei 3Com, it can be widely used in the core layer of the E-government network, the core layer of the campus network and the Education Met
.
Therefore, IPv6 products must pass product tests and public interoperability tests, and provide end users with information on device interoperability and consistency tests.
Huawei 3Com IPv6 transition policy solution
In the process of gradually transitioning from an IPv4 network to an IPv6 network to completely replacing an IPv4 network, the parts on the network are gradually replaced by new parts, the replacement order is the transition policy from
Windows XP, Windows Server 2003 experiments, you can perform experiments on diskless workstation of 3COM VLD and 3COM DABS, and terminal experiments of Windows 2000/Server 2003 and Citrix MetaFrame 1.8/XP.
V. Enterprise Users
Many enterprises, for historical reasons or other reasons, each department has a server, or several important departments have servers. These servers have a single function and fewe
Article Title: Solaris10forx86 Nic replacement configuration strategy. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
I installed solaris 10 for x86 u3 on the PC for testing, and successfully recognized the intel Nic when installing the system. Yesterday, my colleague pulled the intel Nic from my machine. Later, he gave me a
At present, the demand for Routing Switching equipment is very high in the market, especially in enterprises. It can be seen from the data that the performance of Routing Switching equipment is also gradually improving. The vro and vswitch password recovery methods must be mastered by the network administrator. These contents are displayed in the CCNA courses. However, from the description of this user, we can see that the model of the routing switch device used by your company is not CISCO, so
Recently, the organization decided to upgrade the network device. All the originally used 3Com switches, and all the computers were assigned to two VLANs. Except some computers use fixed IP addresses, other computers obtain the address through a DHCP server. After the network is upgraded, the network center router remains unchanged. Most access-level switches are switched to Cisco Catayst 3550 or Cisco Catayst 2950, but the following situations occur
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