1.用TQuery查询多个表后连到dbgrid即可;2.paradox表:'select * from tbname where field='1-1-1980''或者
'select * from tbname where field=:d'然后parambyname('d').asstring='1980-1-1'
'select * from tbname where field=:d'然后parambyname('d').asstring='1980-1-1'
begin
close;
sql.clear;
sql.add('select table1.field1,table1.field2,table2.field1 from table1,table2');
sql.add('where table1.field2=:var');
parambyname('var').asstring=edit1.text;
prepare;
open;
end;