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relational algebra and relational calculas

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Any one plz help

i have completed my relation algebra and calculas topics but whenever i go for question i am confused that how to approach.

i am able to solve objective questions somehow but sometimes not able to write query directly.

plz suggest.
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At first we try to understand basic operator in relation algebra like 

  • Projection
  • Selection
  • Cross product
  • Natural join
  • Conditional join
  • Union,intersection and subtraction

and practic as much as possible.

For relation calculas at first we read proposition logic .

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