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Understanding Indexes

Introduction
Indexes on expressions
Partial indexes
Clustered indexes
Summary
12. Summary

Instruction

Good! Time to wrap things up.

  1. You can create indexes on expressions: 
    CREATE INDEX company_insensitive
ON dev_award (LOWER(company));
  2. If the expression doesn't contain a function call, you'll need an additional pair of parentheses: 
    CREATE INDEX full_name
ON dev_award ((first_name || ' ' || last_name));
  3. You can add a WHERE clause to create a partial index: 
    CREATE INDEX lname_sql
ON dev_award (last_name)
WHERE category = 'sql';
  4. Some databases also provide clustered indexes, but there's no standard syntax for them.

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Exercise

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