Pass parameter by "in" Delphi -

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i need pass parameter sql in delphi using bde using "in", example below:

select * customers id in (:p_in)

i need pass: p_in list of customers. query.parambyname.('p_in').asstring: = '1, 2,3 ', , did not work .. have make array? or passed asvariant?

try : 

p_in  : string ;  := 0 customerlist.count    p_in := p_in +customerlist[i] + ',';   myquery.text := 'select * customers id in (' + p_in  + ' )' ;

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