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This question is not written in clear and precise English. Evaluation is from left to right only after the precedence rules are considered. For more, please see here:
"Precedence is a simple ordering, based on either the importance or sequence. In
relational algebra, the unary operators Π, σ and ρ have the highest precedence.
Next highest is the Cartesian product operator × followed by the join operators
✶, A./ and ./@. The set difference operator − is evaluated next. Finally are the
operators ∪ and ∩. This is the default precedence."
Relational Algebra - 4
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This question is not written in clear and precise English. Evaluation is from left to right only after the precedence rules are considered. For more, please see here:
"Precedence is a simple ordering, based on either the importance or sequence. In relational algebra, the unary operators Π, σ and ρ have the highest precedence. Next highest is the Cartesian product operator × followed by the join operators ✶, A./ and ./@. The set difference operator − is evaluated next. Finally are the operators ∪ and ∩. This is the default precedence."
http://is.muni.cz/th/208197/fi_b/bc_thesis.pdf