请帮我看看下面代码的错误，帮我改正过来create table Contract( Contract_id char(20) primary key, Lessee_id char(20) not null unique, Owner_id char(20) not null unique, House_id char(20) not null unique, Contract_time Date not null ) create table Lessee( Lessee_id char(20) primary key, Lessee_sex char(2) not null, Lessee_address char(50) not null, Lessee_time Date not null, Lessee_state char(100) not null foreign key(Lessee_id) references Contract(Lessee_id) ) alter table Lessee add foreign key(Lessee_id) references Contract(Lessee_id); create table Owner( Owner_id char(20) primary key, Owner_sex char(2) not null, Owner_address char(50) not null, Owner_phone char(11) not null, Owner_status char(10) not null foreign key(Owner_id) references Contract(Owner_id), ) create table Let( Let_id char(20) primary key, Owner_id char(20) not null, Let_introduce char(200) not null, Let_state char(10) not null, ) alter table Owner add foreign key(Owner_id) references Let(Owner_id); create table House( House_id char(20) primary key, House_address char(50), House_area char(50) not null, House_type char(100) not null, House_money char(10) not null, House_time char(50) not null, House_state char(50) not null, foreign key(House_id) references Contract(House_id), ) insert into Contract values('2','1','李四','1 ','2023-07-07') insert into House values('2','1','70','两室一厅','3000','2023-07-07','已租赁') insert into Lessee values('张三','男','2','2023-07-07','租赁中') insert into Let values('5','李四','434636','租赁中') insert into Owner values('李四','男','434636','12124512421','租赁中')

在你的代码中有几个错误：

1. 在 `Lessee` 表中，`Lessee_state` 列缺少逗号。
2. 在 `Owner` 表中，`Owner_status` 列缺少逗号。
3. 在 `Let` 表中，`Let_state` 列缺少逗号。
4. 在 `House` 表中，`House_state` 列缺少逗号。
5. 在 `Contract` 表中，`Contract_id` 列的数据类型是 `char(20)`，但在插入数据时只提供了一个数字 `'2'`，这可能导致数据不匹配。

下面是已经修改过的代码：

create table Contract (
	Contract_id char(20) primary key,
	Lessee_id char(20) not null unique,
	Owner_id char(20) not null unique,
	House_id char(20) not null unique,
	Contract_time Date not null
);

create table Lessee (
	Lessee_id char(20) primary key,
	Lessee_sex char(2) not null,
	Lessee_address char(50) not null,
	Lessee_time Date not null, 
	Lessee_state char(100) not null,
	foreign key(Lessee_id) references Contract(Lessee_id)
);

alter table Lessee add foreign key(Lessee_id) references Contract(Lessee_id);

create table Owner (
	Owner_id char(20) primary key,
	Owner_sex char(2) not null,
	Owner_address char(50) not null,
	Owner_phone char(11) not null, 
	Owner_status char(10) not null,
	foreign key(Owner_id) references Contract(Owner_id)
);

create table Let (
	Let_id char(20) primary key,
	Owner_id char(20) not null,
	Let_introduce char(200) not null,
	Let_state char(10) not null
);

alter table Owner add foreign key(Owner_id) references Let(Owner_id);

create table House (
	House_id char(20) primary key,
	House_address char(50),
	House_area char(50) not null, 
	House_type char(100) not null,
	House_money char(10) not null,
	House_time char(50) not null,
	House_state char(50) not null,
	foreign key(House_id) references Contract(House_id)
);

insert into Contract values('2','1','李四','1','2023-07-07');
insert into House values('2','1','70','两室一厅','3000','2023-07-07','已租赁');
insert into Lessee values('1','男','2','2023-07-07','租赁中');
insert into Let values('5','李四','434636','租赁中');
insert into Owner values('李四','男','434636','12124512421','租赁中');

请注意，我假设 `Lessee_id` 在 `Lessee` 表中应该是主键，并且与 `Contract` 表中的 `Lessee_id` 列进行外键关联。同样，我也假设 `Owner_id` 在 `Owner` 表中是主键，并与 `Contract` 表中的 `Owner_id` 列进行外键关联。如果这些假设不正确，请根据你的需求进行更改。