oracle中自带的测试数据解决方法

oracle中自带的测试数据
装完ORALCLE的时候，里面有自带的测试数据，就是emp,dept,salarygrade那三张表
我现在用MYSQL做学习
谁知道那三张表怎么写出来，我主要时外键那块写不出来，谁写一下，做个学习

------解决方案--------------------
CREATE TABLE SALGRADE
(
GRADE NUMBER,
LOSAL NUMBER,
HISAL NUMBER
)
TABLESPACE SYSTEM
PCTUSED 40
PCTFREE 10
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS 2147483645
PCTINCREASE 0
FREELISTS 1
FREELIST GROUPS 1
BUFFER_POOL DEFAULT
)
LOGGING
NOCACHE
NOPARALLEL
NOMONITORING;


CREATE TABLE EMP
(
EMPNO NUMBER(4),
ENAME VARCHAR2(10 BYTE),
JOB VARCHAR2(9 BYTE),
MGR NUMBER(4),
HIREDATE DATE,
SAL NUMBER(7,2),
COMM NUMBER(7,2),
DEPTNO NUMBER(2)
)
TABLESPACE SYSTEM
PCTUSED 40
PCTFREE 10
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS 2147483645
PCTINCREASE 0
FREELISTS 1
FREELIST GROUPS 1
BUFFER_POOL DEFAULT
)
LOGGING
NOCACHE
NOPARALLEL
NOMONITORING;


CREATE TABLE DEPT
(
DEPTNO NUMBER(2),
DNAME VARCHAR2(14 BYTE),
LOC VARCHAR2(13 BYTE)
)
TABLESPACE SYSTEM
PCTUSED 40
PCTFREE 10
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS 2147483645
PCTINCREASE 0
FREELISTS 1
FREELIST GROUPS 1
BUFFER_POOL DEFAULT
)
LOGGING
NOCACHE
NOPARALLEL
NOMONITORING;