How to apply CASE in Query

If you want to apply some checks in query then best option is to use Cases.
example of case is below:

Select Building.ID,Building.Name,

case when Building.Status='Completed' or Building.Status='Renovate' then
Building.Size
else
0 
end as 'BuildingSize'


It will check for building status and return Building size if building status is completed or renovate and return 0 when the above condition is not satisfied.

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