## Discussion Forum

Que. | Which of the following relational query languages have the same expressive power? 1.Relational algebra 2.Tuple relational calculus restricted to safe expressions 3.Domain relational calculus restricted to safe expressions |

a. | II and III only |

b. | I and II only |

c. | I and III only |

d. | I, II and III |

Answer:I, II and III |