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CREATE TABLE customersĬONSTRAINT customers_pk PRIMARY KEY (customer_id) The following SQL ALTER TABLE statement would add a salary column to the employees table: ALTER TABLE employeesīased on the customers table below, add two columns - one column called contact_name that is a char(50) datatype and one column called last_contacted that is a date datatype. CREATE TABLE employeesĬONSTRAINT employees_pk PRIMARY KEY (employee_number) The following SQL ALTER TABLE statement would rename the departments table to depts: ALTER TABLE departmentsīased on the employees table below, add a column called salary that is an int datatype. CREATE TABLE departmentsĬONSTRAINT departments_pk PRIMARY KEY (department_id) MODIFY supplier_name VARCHAR(100) NOT NULL,ĪLTER COLUMN supplier_name TYPE CHAR(100),īased on the departments table below, rename the departments table to depts. MODIFY (supplier_name char(100) NOT NULL,įor MySQL and MariaDB: ALTER TABLE supplier In this example, we will modify two columns called supplier_name and city. Let's look at an example that uses the ALTER TABLE statement to modify more than one column. To modify multiple columns in an existing table, the SQL ALTER TABLE syntax is:įor MySQL and MariaDB: ALTER TABLE table_nameĪLTER COLUMN column_name TYPE column_definition,