Logical Database reasoning

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Across
  1. 2. Enforces rules on data in a database
  2. 5. Improves performance by adding redundancy
  3. 8. A relationship where one attribute determines another
  4. 9. Represents a missing or unknown value
  5. 10. Returns true if at least one condition is true
Down
  1. 1. A sequence of database operations that must be executed together
  2. 3. Returns true if both conditions are true
  3. 4. Negates a condition in a query
  4. 6. Properties ensuring reliable database transactions
  5. 7. A situation where two transactions wait indefinitely for each other