Dependent and Independent Operations

Some of the operations that we have explained in previous sections can be expressed in terms of other relational-algebra operations. For instance, intersection can be expressed in terms of set difference:

A Linear Notation for Algebraic Expressions

In Combining Operations to Form Queries we used trees to represent complicated expressions of relational algebra. Another option is to invent names for the temporary relations that correspond to the interior nodes of the tree and write a sequence of assignments that create a

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