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CREATE TABLE t1 (pk INT AUTO_INCREMENT PRIMARY KEY, a varchar(30000), UNIQUE (a)) ENGINE=innodb; INSERT INTO t1 (a) VALUES (20),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL); SELECT * FROM t1 WHERE a BETWEEN '1' AND '100'; pk a DROP TABLE t1; CREATE TABLE t2 (n BLOB, UNIQUE(n)); INSERT INTO t2 VALUES (1); DELETE FROM t2 WHERE n = 1; DROP TABLE t2;