Range Swap Between Two Strings | Dataford Interview Questions

Given two strings s and p of the same length n and q queries, each giving a range L to R, swap the characters of s and p within the range for each query and print the final string after all operations.

Asked in the DSA round stage. In this SQL version, each row in string_pairs is an independent test case. Ignore queries with a missing range boundary.

Output

One row per test case with case_id and final_string.
Include all test cases, including those with no valid queries.
Order by case_id ascending.

Schema

string_pairs

Column	Type	Description
case_idPK	INT	Identifier for an independent string test case
s	VARCHAR(100)	First input string
p	VARCHAR(100)	Second input string with the same length as s

swap_queries

Column	Type	Description
query_idPK	INT	Identifier for a range query
case_id	INT	Test case receiving the query
left_pos	INT	Inclusive left endpoint of the range
right_pos	INT	Inclusive right endpoint of the range

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