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i am developing a ruby on rails question bank application.i want to know how to retrive a random records from database with out any duplication.and i am using a MYSQL as a database.Also all the random records show in the view.
Solution: 1
User.limit(10).order("RAND()")
Solution: 2
ids = User.pluck(:id).shuffle[0..9]
User.where(id: ids)
Sorry about my last, i write that almost thoughtlessly.
registers = YourModel.order("RANDOM()").limit(number_of_records)
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Customer.select('email, status_id, COUNT(*) AS cnt').group(:email).having('cnt > 1').update_all(:status_id => 2)
above is my ruby query that I want to convert into mysql.
Please Help me. Please save my life.
Thanks
You can just append .to_sql to the end of your call. That will give you the SQL query.
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Can anyone please tell whether it is possible to create the shared object(.so) files from the existing .cc files?
Thanks !
Yes, you should look into make.
http://www.cs.colby.edu/maxwell/courses/tutorials/maketutor/
You need to compile your object files and then create an shared object out of those.
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I have to save a variable of my bash script into my mysql database.
Any Ideas?
Use the mysql command, something like:
mysql -e "INSERT INTO tablename (colname) VALUES ('$variable')"
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Is there any site where I can get good database with practice queries to solve. I am seeing a lot on internet, but mostly looks like beginner level.
Check out SQL Zoo: http://sqlzoo.net/
See http://www.w3schools.com/sql/default.asp ... I first started with that then I made up a database with 5 or 6 tables and tried myself subqueries and so on...
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at the moment I'm writing a paper and I need some input about the state of the art of selhealing and selfprotection in DBMSs. Does somebody read some interesting articles or books about this topics in the last few month? Doesnt matter which DBMS you have read about.
Regards
Perhaps this: Automatic Page Repair During a Database Mirroring Session.