SQL for Java Devs · interview question
How can you determine the number of rows in a ResultSet?
Multiple choiceMediumchapter-8-curatedpremiumsql-for-java-devsresultsets-and-mapping
Answer and explanation
Correct answer
D. By using rs.last() and rs.getRow()
Why
Using rs.last() moves the cursor to the last row, and rs.getRow() then returns the number of the current row, which is effectively the row count. This should be performed on a scrollable ResultSet.
Test yourself on SQL for Java Devs
A free test with instant, explained results. No account needed.
More SQL for Java Devs questions
- How can JDBC transactions help maintain data integrity during an e-commerce checkout process?
- What would be the effect of not closing a PreparedStatement in a Java application?
- In JDBC, how do you ensure that SQL injection is prevented when executing a query that searches for a user by email?
- Why do teams use SQL JOINs to fetch relational data in a single query in production code?
- What should a repository method mainly encapsulate?
- How can you prevent the N+1 query problem when retrieving a list of orders with their customer details?