sql server - How can I filter a SQL query by all matching values or all values and null values -


this query , not returning null values

select st.station stations st  ((station = case      when @station = n'*'      station      else @station end)   or (station = case       when @station = n'*'       null      else @station end))

try this:

select st.station stations st station = @station or @station = n'*'

if pass '*' @station = n'*' evaluate true , select row, else filter value of @station variable.


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