Leetcode Problem 1613. Find the Missing IDs

1613. Find the Missing IDs

Leetcode Solutions

Using Recursive Common Table Expressions (CTE) to Find Missing IDs

  1. Start by creating a recursive CTE called id_seq that generates a sequence of numbers starting from 1.
  2. In the recursive part of the CTE, increment the number by 1 until it reaches the maximum customer_id present in the Customers table.
  3. Use a SELECT statement to retrieve the generated sequence from the CTE.
  4. Use a WHERE clause to filter out the IDs that exist in the Customers table by using NOT IN or a LEFT JOIN with a NULL check.
  5. Order the final result by the IDs in ascending order.
  6. Return the result set containing the missing IDs.
erDiagram
    Customers {
        int customer_id
        varchar customer_name
    }

Using a Numbers Table to Find Missing IDs

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