DML AIR CONDITIONING & HEATING
altering and deleting database structures such as tables · index · function · views · store procedure and triggers) CREATE TABLE table_name (column1 data_type · column2 data_type · ...) · DROP Delete objects from the database DROP TABLE table_name · ALTER Alter the structure of the database ALTER TABLE table_name ADD COLUMN column_name data_type · TRUNCATE Remove all records from a table · including all spaces allocated for the records are removed TRUNCATE TABLE table_name · COMMENT Add comments to the data dictionary COMMENT ON TABLE table_name IS 'comment_text' · RENAME Rename an object existing in the database RENAME TABLE old_table_name TO new_table_name · Example: CREATE TABLE employees ( employee_id INT PRIMARY KEY · first_name VARCHAR(50) · last_name VARCHAR(50) · hire_date DATE ) · In this example · a new table called employees is created with columns for employee ID · first name
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1. DDL - Data Definition Language DDL (Data Definition Language) consists of SQL commands that can be used for defining, altering and deleting database structures such as tables, indexes and schemas. It simply deals with descriptions of the database schema and is used to create and modify the structure of database objects in the database Command Description Syntax CREATE Create database or its objects (table, index, function, views, store procedure and triggers) CREATE TABLE table_name (column1
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