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NETB299 Основи на базите от данни
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How many rows will return the query?
Which of the following statements explains the given fragment of ER diagram?
Which of the following queries will delete ONE record from the SALESPEOPLE table?
How many rows will return the query?
Let X{w,v,u} represents a relation (table) with name X and fields w, v, and u, where the field w (underlined) is the primary key for X.Let us assume also that data entity A has attributes {a, b, c}, a is the key attribute, B has attributes {x, y, z}, x is the key attribute, and the relationship R has attribute {r}.Which of the following fragments of a relational model represent the correct mapping of the given fragment of E-R diagram?
Which of the following statements explains the given fragment of ER diagram?
How many rows will return the query?
How many rows will return the query?
Let X{w,v,u} represents a relation (table) with name X and fields w, v, and u, where the field w (underlined) is the primary key for X.Let us assume also that data entity A has attributes {a, b, c}, a is the key attribute, B has attributes {x, y, z}, x is the key attribute, and the relationship R has attribute {r}.Which of the following fragments of a relational model represent the correct mapping of the given fragment of E-R diagram?
Let X{w,v,u} represents a relation (table) with name X and fields w, v, and u, where the field w (underlined) is the primary key for X.Let us assume also that data entity A has attributes {a, b, c}, a is the key attribute, B has attributes {x, y, z}, x is the key attribute, and the relationship R has attribute {r}.Which of the following fragments of a relational model represent the correct mapping of the given fragment of E-R diagram?