Quick study sessions to strengthen memory and retain key concepts.
How do SQL JOINs affect the shape of the result set compared to separate queries?
JOINs result in a combined table with columns from all joined tables. When using SQL JOINs, the result…
View Card →What are the trade-offs of using complex SQL JOINs in large datasets?
Complex JOINs can lead to performance issues and maintenance challenges. Using complex SQL JOINs can significantly slow down…
View Card →How does a LEFT JOIN differ from an INNER JOIN in SQL?
LEFT JOIN returns all records from the left table and matched records from the right table, filling with…
View Card →Why is preventing the N+1 query problem important in JDBC applications?
Prevents excessive database load by reducing the number of queries. The N+1 query problem occurs when an application…
View Card →How can transactions ensure data integrity when using JDBC for database updates?
Transactions group multiple operations to succeed or fail together. Transactions allow you to execute a series of database…
View Card →How can you execute a SQL SELECT query and retrieve data using JDBC?
Use the executeQuery() method of Statement or PreparedStatement. The executeQuery() method is used to execute SQL SELECT queries…
View Card →How would you explain an OUTER JOIN, and how does it differ from INNER JOIN in an interview?
An OUTER JOIN returns all rows from one table and the matched rows from another. Unlike INNER JOIN,…
View Card →How do you safely insert parameter values into a SQL query using JDBC?
Use PreparedStatement to insert parameter values safely. PreparedStatements are used to safely include user input into SQL queries,…
View Card →What are the design consequences of using JOINs in application logic?
JOINs embed database logic into your application, affecting flexibility and portability. Using JOINs tightly couples your application logic…
View Card →How would you map a one-to-many relationship in Java using JDBC?
Use a List to represent the 'many' side in Java. In a one-to-many relationship, one entity is associated…
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