## Discussion Forum

Que. | In SQL, relations can contain null values, and comparisons with null values are treated as unknown. Suppose all comparisons with a null value are treated as false. Which of the following pairs is not equivalent? |

a. | x = 5 AND not(not(x = 5)) |

b. | x = 5 AND x> 4 and x < 6, where x is an integer |

c. | x < 5 AND not (x = 5) |

d. | None of the above |

Answer:x < 5 AND not (x = 5) |