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create table t1 (f1 int not null, f2 int, f3 int, primary key (f1,f2), key(f2,f3)) engine=innodb; create view v1 as select * from t1 where f2 = 1; select distinct f1 from v1; f1 drop view v1; drop table t1; CREATE TABLE t1 (a INT NOT NULL, UNIQUE(a)) ENGINE=InnoDB; INSERT INTO t1 VALUES (1),(2); DELETE FROM t1 ORDER BY a LIMIT 1; SELECT * FROM t1; a 2 DROP TABLE t1; CREATE TABLE t1 (a CHAR KEY,b BLOB) ENGINE=InnoDB; DELETE FROM t1 ORDER BY a LIMIT 1; DROP TABLE t1;