The SQL WHERE syntax
A WHERE clause with a SELECT statement:
- SELECT column–names
- FROM table–name
- WHERE condition
A WHERE clause with an UPDATE statement:
- UPDATE table–name
- SET column–name = value
- WHERE condition
A WHERE clause with a DELETE statement:
- DELETE table–name
- WHERE condition
SQL WHERE Clause Examples
Problem: List the customers in Sweden
- SELECT Id, FirstName, LastName, City, Country, Phone
- FROM Customer
- WHERE Country = ‘Sweden’
Results: 2 records
| Id | FirstName | LastName | City | Country | Phone |
|---|---|---|---|---|---|
| 5 | Christina | Berglund | Luleå | Sweden | 0921-12 34 65 |
| 24 | Maria | Larsson | Bräcke | Sweden | 0695-34 67 21 |
Problem: Update the city to Sydney for supplier Pavlova, Ltd.
- UPDATE Supplier
- SET City = ‘Sydney’
- WHERE Name = ‘Pavlova, Ltd.’
Results: 1 record updated.
Problem: Delete all products with unit price higher than $50.
- DELETE FROM Product
- WHERE UnitPrice > 50
Results: 7 records deleted.
Note: Referential integrity may prevent this deletion.
A better approach may be to discontinue the product, that is, set IsDiscontinued to true.
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