Searching the text in a column using PostgreSQL -

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i having table column names no_of_pole , pol_st_typ datatypes integer , character respectively. want check if no_of_pole 2 pol_st_type starts keyword 'double' , if no_of_pole 3 pol_st_type starts keyword 'tripole'. how accomplish using postgresql?

select "no_of_pole","pol_st_typ"  network."pole_structure"  (no_of_pole = '2' , pol_st_typ 'double%')         or (no_of_pole = '3' , pol_st_typ 'tri pole%')

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