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Ask a question about the MySQL list A1 A2 A3 Three tables now I'm writing the words Select A1.*,sum (A2.money) as money from A1 left joins A2 on A1.id=a2.id left joins A3 on a2.no = A3.no GROUP by a1.id; The result is Due to other factors must be connected to the A3 table, resulting in Money 35, I want Money to 25, how should I write? ------to solve the idea---------------------- A3.no not uniqu

Ask a question, about 3DES encryption, know clear text and ciphertext, can launch key?

Excuse me, ask a simple question. var is_fans= ; This is in JS write a sentence, PHP variable already have, I such assignment, will cause use Is_fans this JS variable time, in partial browser, cannot use. Excuse me, have you ever encountered such a situation? ------Solution-------------------- See what's wrong with the console. ------Solution-------------------- var is_fans= ' ; Try it with a si

Ask a basic question, about uploading a file S_uploaded_file and File_exists Both check the file exists? Parameters are paths, so why upload files must use Is_uploaded_file? ------to solve the idea---------------------- Oh, this is a matter of historical origin. The use of Is_uploaded_file is also entirely self-protective. PHP provides two scenarios for handling upload files Move_uploaded_file And Is_up

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Ask a simple Ajax question, I am anxious to die ~ Just learned Ajax, wrote a paragraph ~ ~ Feel JS inside the IF (str== "good") does not work ~ ~ If you take it out alone, it does output good Put it in judgment, and I don't know why. Solve ~ Get me a long time ~ ~ Nasty to the Novice!!!! This is HTML Untitled DocumentDSDs This is JS: var xmlHttp;function upsdowns (AC,ID,UD,MK)//,did){Gets the X

3. FreeThe free command is a quick and easy way to get an overview of memory usage, which is obtained from "/proc/meminfo". It provides a snapshot of the total/idle physical memory and system swap area, as well as the used/idle kernel buffers. $ free -h 4. GNOME System MonitorGNOME system Monitor is a graphical interface application that shows more recent historical information about the utilization of system resources, including CPU, memory, swap, and network. It can also

Ask a character set question-Linux Enterprise Application-Linux server application information. The following is a detailed description. Hello everyone, I have a question to ask, but I cannot solve it. Now I have a server that uses FC2, the server environment is APACHE + PHP + MYSQL, and the default character set forma

Ask a database design question! Ask a database design question! Assume an application. For example, forum We send a post, and we create a post table topic. Then, it allows visitors to reply and prepare a reply table reply. My problem is: Suppose we want to know the number of replies in each post. how should we make

Ask a question about how to obtain a field from the database on mobile. ask a question about how to obtain a field from the database on mobile = ''. A program for sending text messages Obtain a piece of data based on xingming_iD. how can I assign the property of one of the mobile phones to the back of mobile? Troub