what is denormalization in sql
Denormalization is a strategy used
on a previously-normalized database to
increase performance. In computing,
denormalization is the process of trying
to improve the read performance of a database,
at the expense of losing some write performance,
by adding redundant copies of data or by grouping data.denormalise SQL command
select d.StudentId, d.Name, d.Course, r1.result as Term1Result, r2.result as Term2Result
from StudentDetails d
left join StudentResults r1 on d.StudentId = r1.StudentId and r1.term = 1
left join StudentResults r2 on d.StudentId = r2.StudentId and r2.term = 2Copyright © 2021 Codeinu
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