This week's giveaway is in the Programmer Certification (OCPJP) forum.
We're giving away four copies of Java Mock Exams (software) and have David Mayer on-line!
See this thread for details.
Win a copy of Java Mock Exams (software) this week in the Programmer Certification (OCPJP) forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic

Regarding PreparedStatement

 
adeeb alexander
Ranch Hand
Posts: 268
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi,
I know that to get the row count from sql we should give as follows
select count(*) from tablename where columnName = value;
is this wright
Now my problem is, actually i am adding students data in the table from text fields. But what i need is the maximum row count for each roll number should be 3. There should not be repeated rows more than three times. Please tell me how can i achieve this.
Thanks and Regards
 
Jeanne Boyarsky
author & internet detective
Sheriff
Posts: 35976
422
Eclipse IDE Java VI Editor
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Adeeb,
Take a look at the having/group by clauses. They allow you to do the query on different sets of data.
 
Happiness is not a goal ... it's a by-product of a life well lived - Eleanor Roosevelt. Tiny ad:
the new thread boost feature: great for the advertiser and smooth for the coderanch user
https://coderanch.com/t/674455/Thread-Boost-feature
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!