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42 lines
1.4 KiB
Text
42 lines
1.4 KiB
Text
drop table if exists t1,t2;
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create table t1 (
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a int not null references t2,
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b int not null references t2 (c),
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primary key (a,b),
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foreign key (a) references t3 match full,
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foreign key (a) references t3 match partial,
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foreign key (a,b) references t3 (c,d) on delete no action
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on update no action,
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foreign key (a,b) references t3 (c,d) on update cascade,
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foreign key (a,b) references t3 (c,d) on delete set default,
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foreign key (a,b) references t3 (c,d) on update set null);
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create index a on t1 (a);
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create unique index b on t1 (a,b);
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drop table t1;
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create table t1 (id int primary key) engine = innodb;
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create table t2 (id int PRIMARY KEY, FOREIGN KEY (id) REFERENCES t1(id)) engine=innodb;
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insert into t1 values (1), (2), (3), (4), (5), (6);
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insert into t2 values (3), (5);
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delete from t1;
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ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`id`) REFERENCES `t1` (`id`))
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select * from t1;
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id
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1
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2
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3
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4
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5
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6
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delete ignore from t1;
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Warnings:
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Warning 1451 Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`id`) REFERENCES `t1` (`id`))
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Warning 1451 Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`id`) REFERENCES `t1` (`id`))
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select row_count();
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row_count()
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-1
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select * from t1;
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id
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3
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5
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drop table t2;
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drop table t1;
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