How many mens doubles when womens doubles is catrine bengtsson margit borg?
CREATE TABLE table_12171145_1 (
    mens_doubles VARCHAR,
    womens_doubles VARCHAR
)
SELECT COUNT(mens_doubles) FROM table_12171145_1 WHERE womens_doubles = "Catrine Bengtsson Margit Borg"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many mens doubles when womens doubles is catrine bengtsson margit borg? ### Input: CREATE TABLE table_12171145_1 (
    mens_doubles VARCHAR,
    womens_doubles VARCHAR
) ### Response: SELECT COUNT(mens_doubles) FROM table_12171145_1 WHERE womens_doubles = "Catrine Bengtsson Margit Borg"