php - Mysql Limit column value repetition N times -

-

मेरे पास दो टेबल हैं 

  ग्राहक (idCustomer, ecc .. ecc ..) टिप्पणी (आईडीसी ग्राहक, आईडी कॉममेंट, ईसीसी .. ईसीसी ..)

स्पष्ट रूप से दो तालिकाएं एक साथ जुड़ जाती हैं, उदाहरण के लिए 

  SELECT * FROM टिप्पणी के रूप में सह जॉइन ग्राहक एएस कू ऑन cu.idCustomer = co.idCustomer

इसके साथ मैं उस तालिका से जुड़े सभी टिप्पणी का चयन करता हूं ग्राहक, लेकिन अब मैं टिप्पणी की संख्या को 2 अधिकतम टिप्पणी प्रति सीमित करना चाहता हूँ ग्राहक।

पहली बात मैं देख रहा हूं ग्रुप द्वारा cu.idCustomer का उपयोग करना है, लेकिन यह प्रति ग्राहक केवल 1 टिप्पणी की सीमा है, लेकिन मैं प्रति ग्राहक प्रति 2 टिप्पणी चाहता हूं।

मैं इसे कैसे प्राप्त कर सकता हूं?

MySQL में एक विकल्प सर्वर-साइड वेरिएबल है उदाहरण के लिए: 

  सेट @num: = 0, @customer: = -1; ग्राहक से जुड़ने के साथ * आईडीसी ग्राहक, पोस्टडेट द्वारा दिए गए आदेशों के अनुसार * आईडीसी ग्राहक, टिप्पणी टेक्स्ट, @ नाम: = अगर (@ ग्राहक = आईडीसी ग्राहक, @ 1, 1) को पंक्ति_एनम्बर, @ ग्राहक: = आईडी से चुनें) Co.idCustomer = cu.idCustomer जहां co.row_number & lt; = 2

Comments

Post a Comment

Popular posts from this blog

php - Login to icq account to receive messages from contact #12345678 -

-
What's the way php-script is running, which does the following: - Enter the icq-account - Received Existing contacts are all messages (if any) from # 12345678 and - write those messages in an array such as $ Messages = array (); Edit I like to answer: "Blaee" is a good, active community, it is often updated because ICQ changes its internal changes Let's see: The first result of that: This class can be used to communicate with other ICQ consumers. This can: Non-interception with an ICQ server Authenticate as a given user Get offline message Send and receive messages (...) I would say that code Looking for you.
Read more

windows - Heroku throws SQLITE3 Read only exception -

-
After I deploy the app to Heroku, I have to run migration scripts and get this error message ... ITES \ padrino \ prophetmargin & gt; Heroku Rack AR: Rack mutated! SQLite3 :: ReadOnlyException: only one try to write database to read: CREATE TABLE "schema_migrations" ( "version" varchar (255) NOT NULL) /disk1/home/slugs/215264_925fd2c_65a3/mnt/.bundle/gems/gems/ padrino-core- is 0.9.11 / lib / padrino-core / cli / rake.rb: 9: in `init ' how can this be? I also tried to run Heroku dbpush SQLite: //db/my-db.db and that did not work Horoku sqlite3 but using postgres does not do. I'm not sure why you are receiving this error, however, as I have used sqlite3 in development and when pushing it into its travel, they do some magic which migrates to postgrads. I'm absolutely sure how Heroku does 'backwash' this database but it seems that this is happening to you because it's the SQLite db file which is obviously due to Heroku's...
Read more

How to get NUnit information into CruiseControl.Net 1.5 after NCover has run NUnit? -

-
I have installed NCOVER 3.4 on my Cruise Control 1.5 and after some tinking, my cover report is in my cleanliness Looks installed cc. Although I can not see the results of the test (and never after installing CC Net 1.5, as I remember 1.4 it 'just work'). How can I get the results of unit test from the NCOV display in the CCIN? Anders, Denmark "> Sorry - I got to know myself. I was including an incorrect file under the Publisher / Merge / File. Once correct, it works as desired.
Read more