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When using mysql, you sometimes need to query records with unique fields. Although mysql provides the keyword distinct to filter out redundant duplicate records, only one record is retained, but it is often used to return the number of records that do not repeat, instead of returning all values that do not record the record. The reason is that distinct can only return its target field, but cannot return other fields. This problem has plagued me for a long time. If distinct cannot solve this prob

One year for a small company, let's take a look at what the front-end of a small company can do. One year's front-endPreface Yesterday, I took a day off to test subject 3. As a result, the first frame was hung on the light which was not completely closed, and the second frame was hung on the front of the car when turning, when I heard the teacher say "Go down", I felt sad and red-faced. This made me very depressed and didn't want to go back to work at

Opening the cmd command line is definitely not a mysql command line. The first time I got it wrong, I was depressed for a long time and backed up the MySQL database command mysqldump-hhostname-uuser Opening the cmd command line is definitely not a mysql command line. The first time I got it wrong, I was depressed for a long time and backed up the MySQL database command mysqldump-hhostname-uuser Open th

Super excited. Today is still a great day-general Linux technology-Linux technology and application information. The following is a detailed description. Author: walking on the cloud in the wheat field I have been studying linux for a while, but it has been stuck on the linux NIC driver for the last week or for more than a week, because enterprise 6.0 of the Red Hat server does not support realtek's 8169sc Nic, I found a lot of information on the Internet and downloaded the source code, but i

, Wang Yonggang of Google gave a speech, which not only showed me the intelligence and free culture of Google, but also showed me what Google did in the Open Source Field, it also touched each of my nerves. Harvest 6:In his keynote speech, Dr. Zhang's figure on the platform shows that MM is pretty, basically comparable to that of Chongqing. Let's talk about how this hero will be depressed. Depressing 1:First, take a bus. Because I am not familiar with

In order to make qtopia support touch level, these two naively exhausted their efforts and thoughts. I have been working for about 20 hours and still have no results. I am depressed, depressed, and extremely depressed! I have read some documents and the process is difficult. I will make a simple summary below: In Linux, there are two types of touch flat drivers:

: seteffectopbackground (const qcolor );Qwsserver: setjavastopbackground (const qimage ); Qtopia Core 4 provides the following APIs:Qwsserver: setbackground (const qbrush ); The default color is in the qwindowsystem_qws.cpp file of the source code and assigned a value in the constructor of qwsserver. You can also directly modify the source code. Qtopia supports Touch Screen The following paragraph is excerpted from the http://blog.csdn.net/skalidis/archive/2006/03/04/615079.aspx In o

another batch, remove the duplicated items, and summarize them. No specific code can be written, just write down the idea. At that time, I was so depressed that I thought about it. When I got down, I couldn't write the code. It was very inefficient to write a question. Last SystemI don't have a good idea about the design question. The question is about the distribution of massive data in 100 computers, and I want to find a way to efficiently count th

with him ." He is depressed. "No, no, it does not smell bad. I am used to it ." I smiled and took it seriously. "Oh, you used to like XX. Otherwise, how would you like it ?" He is angry. "No, isn't it? Your taste is different from that of him ." I finally understand what the problem is. He was very satisfied with the answer. He turned around and went to sleep without taking a bath. 6. In general, the enthusiasm of a comrade who does not like to take

I have been doing a little thing over the past few days, and I have been very depressed about data binding. It takes a lot of time for me to understand what is going on in the end, I bound the data of ListBox and ComboBox, and there was always a problem when getting the data. I never met it before when I learned it, The binding method of is String SQL = "select * From userinfo ";DS = dB. getdataset (SQL );Lboxuser. datasource = Ds. Tables [0];Lb

finally be knocked out for a week, and it suddenly felt as long as ACM had returned BFs, DFS (search on a simple graph) is finished. Hehe later. After that, I learned about the codeforces website. I heard that Daniel is working on it. Of course, I did what I wanted to do. I 've never missed it from 198 to 273, at first, I had only two questions, so even div2 had a very bad mix, but I believe that as long as I keep doing it, I can increase my score. Even so, I have never made up my questions. I

I know that I should not be so depressed, but I still can't help but feel depressed, as if I had been depressed. I know that I am happy, but my heart is always bitter and there is no way to say it. It cannot be said. Maybe it's because you have a high heart or other reasons. Really, there are some things that I can't really tell, but I may be naturally sensitiv

Preg_replace used more than php5.2 default allowed bytesThat is, the size of Pcre.backtrack_limit and Pcre.recursion_limit.discuz!6.0.0 official version of the program since the release, everyone is in full swing in the upgrade, but some plug-ins in 6.0, there is a problemLike http://www.discuz.net/viewthread.php?tid=559133, the bank plugin.White screen will appear after installing PHP for 5.2.0 and aboveFrom the perspective of discuz! users, we need to assist plugin authors to solve this proble

Let PHP session never expire, you may not have encountered such a depressing problem, but I met, very depressed. We developed a system that only the company's customer service staff can use--a limited number of customer service personnel. It is this limited number of customer service personnel suddenly raised the question a few days ago: we every very short period of time (half an hour do not operate the page), is anxious to solve customer problems,

present in m,m (depressed ing) (PS: Table depressed ...) Tell me the set of how to use it is not depressed ...), such asM A A M M ZInput/output formatInput format:Line 1th: Integer P (12nd.. P+1: Two letters and an integer separated by a space:The markings of the pasture connected to the road and the length of the road (1Output format:A separate line consists of

When using mysql, you sometimes need to query records with unique fields. Although mysql provides the keyword distinct to filter out redundant duplicate records, only one record is retained, but it is often used to return the number of records that do not repeat, instead of returning all values that do not record the record. The reason is that distinct can only return its target field, but cannot return other fields. This problem has plagued me for a long time. If distinct cannot solve this prob

depressed. Haha, what is depressing? How can I face it? The key is my mentality. I said, "depressed and progressing ". If you are depressed, you already know your shortcomings. What you need to do next is to study hard and make continuous progress. If you do not know how to study, you have not been shot by a senior. When you have no face or skin, you will not tr

Depressed, extremely depressed, yesterday installed oracle11g, and then installed PlSql8, open any project page to report the following error, it is inexplicable, This is the C drive machine. config. How can this problem be solved! My system is win7 + vs2008 I am in a hurry. Right-click to view the page and report the following error, Machine. config, And you are afraid that an error will occur when you mod

that do not repeat, instead of using it to return all values that do not record duplication. The reason is that distinct can only return its target field, but cannot return other fields. This problem troubles me.For a long time, if distinct cannot be used to solve the problem, I only need to use dual-loop queries. This will undoubtedly directly affect the efficiency of a station with a large amount of data. So I spent a lot of timeWhen I studied this problem, I couldn't find a solution on the I

, selflessness, contentment, and quietness-these spiritual qualities are beyond the control of the human body, allowing you to operate in harmony with all kinds of functions and give you a healthy constitution. Look and gaze can read a realm. The free and easy realm helps us adjust our mood, seek peace of mind, and maintain health and happiness. Wrong ideas can undermine the harmony between a person's spirit and physical strength. Wrong ideas, regardless of their nature, will leave scars on the