Advanz 101 Systems Interview Questions and Answers

A composite key is a combination of two or more columns that uniquely identifies a record in a database table.

• Composite keys are used to enforce uniqueness in a table.

• They are created by combining two or more columns that individually may not be unique.

• Composite keys can be made up of any data type, including strings, numbers, and dates.

• Example: A table of orders may use a composite key of customer ID and order ID to e...read more

Write Rest Controller with Get and POST methods

• Create a class with @RestController annotation

• Define methods with @GetMapping and @PostMapping annotations

• Use @RequestBody to receive data in POST method

• Use @PathVariable to receive data in GET method

• Return ResponseEntity with appropriate status codes