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- 2. Introduction to SQL What is the meaning of SQL? SQL means Structured Query Language. What is SQL? It is a query language that allows user to specify conditions. Query is a user-request retrieve data or information with a certain condition.
- 3. Introduction to SQL Data Definition Language Create, Alter, Delete Tables, and their attributes Data Manipulation Language Query one or more tables. Insert, Delete, and Modify tuples in tables.
- 4. Example of a Table in SQL Table Name Product Attributes Product_Code Product_Name Product_Price Category Manufacturer A0001 Iphone 10s P100,000.00 Smart Phones Apple Inc. A0002 Samsung Galaxy S8 P80,000.00 Smart Phones Samsung Inc. A0003 Nokia Lumia 99 P70,000.00 Bomb Phones Nokia Inc. A0004 Facebook Mobile P50,000.00 Smart Phones Facebook Inc. Tupels or Rows
- 5. Explanation of Table The Schema of a table is the table name and its attributes: Product(Product_Code, Product_Name, Product_Price, Category, Manufacturer) A Key is an attribute whose values is unique Product(Product_Code, Product_Name, Product_Price, Category, Manufacturer)
- 6. Data Types in SQL Character: CHAR VARCHAR Numbers: INT BIGINT SMALLINT DOUBLE DECIMAL FLOAT Others: Currency, Date, Time
- 7. Simple SQL Query Product_Code Product_Name Product_Price Category Manufacturer A0001 Iphone 10s P100,000.00 Smart Phones Apple Inc. A0002 Samsung Galaxy S8 P80,000.00 Smart Phones Samsung Inc. A0003 Nokia Lumia 99 P70,000.00 Bomb Phones Nokia Inc. A0004 Facebook Mobile P50,000.00 Smart Phones Facebook Inc. SELECT * FROM Product WHERE category='Bomb Phones‟ Product_Code Product_Name Product_Price A0003 Nokia Lumia 99 P70,000.00 Category Manufacturer Bomb Phones Nokia Inc.
- 8. Details Case Sensitive SELECT or Select or select Product or product „Bomb Phones‟ or „bomb phones‟ Constant „Bomb Phone‟ or “Bomb Phone”