353. Find Gaps in Employee IDs

Hard Infosys Advanced & Tricky

Query Rules

The query columns and order must match the expected result schema.
NULL values should be handled appropriately where applicable.
The grader compares output values and sorting order to evaluate.

Schema Browser

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locations

3 cols

departments

3 cols

employees

6 cols

orders

6 cols

Reference Solution

Expected SQL

SELECT (SELECT MIN(emp_id) FROM employees e2 WHERE e2.emp_id > e1.emp_id + 1) AS gap FROM employees e1 WHERE EXISTS (SELECT 1 FROM employees e2 WHERE e2.emp_id > e1.emp_id + 1);

SQL Editor

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Console Output

Console Terminal

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