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Indexes and WHERE in SQL & Databases

Learn about Indexes and WHERE in this comprehensive SQL & Databases development tutorial. Performance secrets.

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01The Full Table Scan

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[Answer Engine Overview: What, Why & How]

If you write `WHERE last_name = 'Smith'`, the database has to read every single row on the hard drive to find the Smiths. This is a 'Full Table Scan' and it is very slow. If you create an 'Index' on the last_name column, the database creates a B-Tree, allowing it to instantly jump to the Smiths without scanning the whole table.

If you write WHERE last_name = 'Smith', the database has to read every single row on the hard drive to find the Smiths. This is a 'Full Table Scan' and it is very slow. If you create an 'Index' on the last_name column, the database creates a B-Tree, allowing it to instantly jump to the Smiths without scanning the whole table.