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Given the following relations Vehicle (Reg_no, make, colour) Person(eno, name, address) Owner(eno, reg_no) Write expressions in the relational algebra to answer the following queries:-(i) List the reg_no of vehicles owned by John.(ii) List the names of persons who own maruti cars.(iii) List all the red coloured vehicle.
Ans: (i) π reg_no (σ name='John' (PERSON OWNER)) // list of ref_no of vehicles (ii) π name (σ make='maruti' (PERSON OWNER VEHICAL)) // list of names of persons (iii) σ colour='red' (VEHICAL) // list all the red color
Object Oriented model :An object has values stored in instance variables within the object. An object also has bodies of code that execute on the object. These bodies of code are
we need example of 2phase locking
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