1. Database Design and Development
SQL – DELETE & UPDATE

2. Learning Intention
I will learn how to use SQL to DELETE data from a table and UPDATE data in a table.

3. DELETE(ing) with SQL
Use a DELETE statement to remove records from a database table.
The statement is followed by the name of the table and a WHERE clause which states what criteria must be met.
DELETE FROM tableName
WHERE criteria to be met;

4. DELETE(ing) with SQL e.g. DELETE FROM Hotel
WHERE HotelName = "The Cheapo“;
e.g. To remove all 1 and 2 star hotels with no swimming pool:
DELETE FROM Hotel
WHERE starRating <= 2
AND swimmingPool = No;

5. UPDATE(ing) with SQL
The UPDATE statement is used to alter records in a table.
The statement is followed by the name of the table, a SET clause and a WHERE clause which states what criteria must be met.
UPDATE tableName
SET fieldName to updated value
WHERE criteria to be met;

6. UPDATE(ing) with SQL
e.g. The Millenium hotel in Glasgow has been upgraded from a 4 star to a 5 star hotel.
UPDATE Hotel
SET starRating = 5
WHERE hotelName = "Millenium";

7. Pupil Task
Complete the following: SQL Booklet Tasks 7, 8 and Extension Task 2

8. Success Criteria
I can create SQL DELETE statements to remove data from a table and SQL UPDATE statements to modify data in a table.