Write the relational algebra expression for the following queries I. Find all tuples from player relation for which country is Pakistan
II. Select all the tuples for which runs are greater than or equal to 15000.
III. List all the countries in Player relation

State the parts of a variable declaration?

The three logical operators used to write compound conditions are "and," "or," and "not." a: true b: false

What is wi-fi infrastructure? a metropolitan area network that uses radio signals to transmit and receive data a communications technology aimed at providing high-speed wireless data over metropolitan area networks a means by which portable devices can connect wirelessly to a local area network, using access points that send and receive data via radio waves includes the inner workings of a wi-fi service or utility, including the signal transmitters, towers, or poles and additional equipment required to send out a wi-fi signal