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Developer-C 11.1
3.0
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CREATE FUNCTION generate_password (p_alphabet VARCHAR(255), p_length INT) RETURNS VARCHAR(255) RETURN (WITH RECURSIVE cte AS ( SELECT 1 n UNION ALL SELECT n + 1 FROM cte WHERE n < p_length) SELECT GROUP_CONCAT(SUBSTRING(p_alphabet FROM CEIL(RAND() * LENGTH(p_alphabet)) FOR 1) SEPARATOR '') FROM cte);
CREATE FUNCTION generate_and_check() RETURNS CHAR(8) BEGIN DECLARE unique_key CHAR(8); REPEAT SET unique_key := generate_password('qwertyuiopasdfghjklzxcvbnm0123456879', 8); UNTIL !COALESCE(( SELECT COUNT(*) FROM mytable WHERE key_column = unique_key ), 0) END REPEAT; RETURN unique_key; END
CREATE TABLE mytable (key_column CHAR(8)); INSERT INTO mytable (key_column) SELECT generate_and_check(); INSERT INTO mytable (key_column) SELECT generate_and_check(); INSERT INTO mytable (key_column) SELECT generate_and_check(); INSERT INTO mytable (key_column) SELECT generate_and_check(); INSERT INTO mytable (key_column) SELECT generate_and_check();
SELECT * FROM mytable;
key_column
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