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CREATE TABLE t1 (a INT) ENGINE=InnoDB;
INSERT INTO t1 (a) VALUES (1),(2);
CREATE TABLE t2 (b INT) ENGINE=InnoDB;
CREATE TRIGGER tr1 BEFORE UPDATE ON t1 FOR EACH ROW SET @a = 0;
CREATE TRIGGER tr2 BEFORE INSERT ON t2 FOR EACH ROW DELETE FROM t1 LIMIT 1;
SET AUTOCOMMIT= OFF;
LOCK TABLES t2 WRITE;
DELETE FROM t1 LIMIT 1;
SAVEPOINT A;
UNLOCK TABLES;
DROP TABLE t1, t2;
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