Oracle SQL Developer

Using SQL Data Definition Language Statements-- you can use MIN to find the minimum salary for employees with manager 122SELECT MIN(salary) FROM employees WHERE manager_id = 122;-- this computes the minimum and maximum salary by job_id groups-- the job_ids groups are sorted in alphabetical orderSELECT MIN(salary), MAX(salary), job_id FROM employeesGROUP BY job_id ORDER BY job_id;6.6 Using SQL Data Definition Language StatementsData definition language (DDL) statements include CREATE, ALTER, and DROP fordefining database objects. When managing database objects, SQL Developer providesa simple and easy-to-use interface that can be utilized instead of SQL DDL statements.In this guide, some basic SQL DDL statements are used in the code examples and abrief description of some DDL statements are discussed here.This topic includes the following topics:■ Creating a Table With SQL■ Creating and Modifying an Index With SQL■ Creating and Modifying a Constraint With SQL■ Altering a Table With SQL■ Dropping a Table With SQL■ Creating and Dropping a Sequence■ Creating and Dropping a Synonym6.6.1 Creating a Table With SQLTo create a database object, such as a table, use the SQL CREATE statement as shown inExample 6–21. When you create a table, you need to provide data types for eachcolumn. For more information about tables, see Managing Tables.Example 6–21Creating a Simple Table-- create a simple table for keeping track of birthdaysCREATE TABLE my_birthdays( first_name VARCHAR2(20),last_name VARCHAR2(25),bday_date DATE);Optionally, you can provide constraints as shown inExample 6–22. The use ofconstrains is discussed in Ensuring Data Integrity With Constraints.Example 6–22Creating a Table With Constraints-- create a table similar to the employees table in the HR schemaCREATE TABLE my_employees( employee_id NUMBER(6),first_name VARCHAR2(20),last_name VARCHAR2(25) CONSTRAINT my_emp_last_name_nn NOT NULL,emailVARCHAR2(25) CONSTRAINT my_emp_email_nn NOT NULL,phone_number VARCHAR2(20),SQL: Usage Information 6-15