You executed the following CREATE TABLE statement that resulted in an error:
SQL> CREATE TABLE employees(emp_id NUMBER(10) PRIMARY KEY, ename VARCHAR2(20), email NUMBER(3) UNIQUE, address VARCHAR2(500), phone VARCHAR2(20), resume LONG, hire_date DATE, remarks LONG, dept_id NUMBER(3) CONSTRAINT emp_dept_id_fk REFERENCES departments (dept_id), CONSTRAINT ename_nn NOY NULL(ename)); Identify two reasons for the error.

Evaluate the following CREATE TABLE commands:
CREATE_TABLE orders
(ord_no NUMBER (2) CONSTRAINT ord_pk PRIMARY KEY,
ord_date DATE,
cust_id NUMBER (4) );
CREATE TABLE ord_items
(ord _no NUMBER (2),
item_no NUMBER(3),
qty NUMBER (3) CHECK (qty BETWEEEN 100 AND 200),
expiry_date date CHECK (expiry_date> SYSDATE),
CONSTRAINT it_pk PRIMARY KEY (ord_no, item_no),
CONSTARAINT ord_fk FOREIGN KEY (ord_no) REFERENCES orders (ord_no) );
The above command fails when executed. What could be the reason?

Examine the command to create the BOOKS table.
SQL> create table books(book id CHAR(6) PRIMARY KEY,
title VARCHAR2(100) NOT NULL,
publisher_id VARCHAR2(4),
author_id VARCHAR2 (50));
The BOOK ID value 101 does not exist in the table.
Examine the SQL statement.
insert into books (book id title, author_id values
('101','LEARNING SQL','Tim Jones')

The CUSTOMERStable has a CUST_CREDIT_LIMITcolumn of data type NUMBER.
Which two queries execute successfully?

Examine the structure of the EMPLOYEES table.

You must display the details of employees who have manager with MANAGER_ID 100, who were hired in the past 6 months and who have salaries greater than 10000.
Which query would retrieve the required result?