Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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CREATE TABLE tbl (id int, userid int);
INSERT INTO tbl VALUES (1 , 1), (2 , 5), (3 , 5), (4 , 5), (5 , 9);
SELECT userid
FROM tbl
GROUP BY userid
HAVING COUNT(userid) = 1;
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