Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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CREATE TABLE city (name VARCHAR(64));
INSERT INTO city VALUES ('Moscow'), ('New York');
CREATE TABLE ad_cars (city VARCHAR(64));
INSERT INTO ad_cars VALUES ('Moscow');
SELECT city.name
FROM city
WHERE EXISTS (
SELECT city FROM ad_cars WHERE ad_cars.city = city.name
);
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