Simple question about code

Question

Hello, I am beginning with SQL again after a long break and am having a niggling problem with the following code. What is going wrong? Thanks, Jonathon Sunny
CREATE
TABLE CHILDREN
CHILD_ID
INT NOT
NULL PRIMARY KEY,
FNAME
VARCHAR(24)
NOT NULL,
LNAME
VARCHAR(24)
NOT NULL,
PHONE
CHAR(12)
NOT NULL,
CHECK (PHONE
LIKE '(0[0-9][0-9])[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]'),
CHILDGRADE
VARCHAR(8)
NOT NULL,
CHECK (CHILDGRADE
LIKE 'BEGINNER'
OR 'NOVICE' OR
'SKILLED' OR
'EXPERT'))
CREATE
TABLE INSTRUCTORS
STAFF_NO
INT NOT
NULL PRIMARY KEY,
FNAME
VARCHAR(24)
NOT NULL,
LNAME
VARCHAR(24)
NOT NULL,
PHONE
CHAR(13)
NOT NULL,
CHECK (PHONE
LIKE '(0[0-9][0-9])[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]'))
CREATE
TABLE LESSONS
LESSON_ID
INT NOT
NULL PRIMARY KEY,
DAY
DATE NOT
NULL,
TIME
TIME NOT
NULL,
LESSONGRADE
VARCHAR(8)
NOT NULL,
CHECK (LESSONGRADE
LIKE 'BEGINNER'
OR 'NOVICE' OR
'SKILLED' OR
'EXPERT'))
CREATE
TABLE QUALIFICATION
QUAL_NAME
VARCHAR(24)
NOT NULL
PRIMARY KEY,
DATE_AWARDED
DATE NOT
NULL,
INSTITUTIONNAME
VARCHAR(24)
NOT NULL)
CREATE
TABLE BOOK
FOREIGN
KEY (CHILD_ID,
LESSON_ID))
CREATE
TABLE TEACH
FOREIGN
KEY (LESSON_ID,
STAFF_ID))
CREATE
TABLE AWARDED
FOREIGN
KEY (STAFF_ID,
QUAL_NAME))

Answer 1

Bellow is the right one:
CREATE TABLE CHILDREN (
CHILD_ID INT NOT NULL PRIMARY KEY,
FNAME VARCHAR(24) NOT NULL,
LNAME VARCHAR(24) NOT NULL,
PHONE CHAR(12) NOT NULL,
CHECK (PHONE LIKE '(0[0-9][0-9])[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]'),
CHILDGRADE VARCHAR(8) NOT NULL,
CHECK (CHILDGRADE = 'BEGINNER' OR CHILDGRADE = 'NOVICE' OR CHILDGRADE = 'SKILLED' OR CHILDGRADE = 'EXPERT'))
CREATE TABLE INSTRUCTORS (
STAFF_NO INT NOT NULL PRIMARY KEY,
FNAME VARCHAR(24) NOT NULL,
LNAME VARCHAR(24) NOT NULL,
PHONE CHAR(13) NOT NULL,
CHECK (PHONE LIKE '(0[0-9][0-9])[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]'))
CREATE TABLE LESSONS (
LESSON_ID INT NOT NULL PRIMARY KEY,
DAY DATE NOT NULL,
TIME TIME NOT NULL,
LESSONGRADE VARCHAR(8) NOT NULL,
CHECK (LESSONGRADE = 'BEGINNER' OR LESSONGRADE = 'NOVICE' OR LESSONGRADE = 'SKILLED' OR LESSONGRADE = 'EXPERT'))
CREATE TABLE QUALIFICATION (
QUAL_NAME VARCHAR(24) NOT NULL PRIMARY KEY,
DATE_AWARDED DATE NOT NULL,
INSTITUTIONNAME VARCHAR(24) NOT NULL)
CREATE TABLE BOOK (
CHILD_ID INT NOT NULL,
LESSON_ID INT NOT NULL
FOREIGN KEY (CHILD_ID) REFERENCES CHILDREN(CHILD_ID),
FOREIGN KEY (LESSON_ID) REFERENCES LESSONS(LESSON_ID))
CREATE TABLE TEACH (
LESSON_ID INT NOT NULL,
STAFF_ID INT NOT NULL
FOREIGN KEY (LESSON_ID) REFERENCES LESSONS(LESSON_ID),
FOREIGN KEY (STAFF_ID) REFERENCES INSTRUCTORS(STAFF_NO))
CREATE TABLE AWARDED (
STAFF_ID INT NOT NULL,
QUAL_NAME VARCHAR(24) NOT NULL
FOREIGN KEY (STAFF_ID) REFERENCES INSTRUCTORS(STAFF_NO),
FOREIGN KEY (QUAL_NAME) REFERENCES QUALIFICATION(QUAL_NAME))
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