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var
sqlstr:string;
firsttj:boolean;
begin
sqlstr:='select * from table1';
firsttj:=true;
if checkbox1.checked or checkbox2.checked or checkbox3.checked then
sqlstr:=sqlstr+' where ';
if checkbox1.checked then
begin
sqlstr:=sqlstr+'...'(学历的条件);
firsttj:=false;
end;
if checkbox2.checked then
begin
if firsttj then
sqlstr:=sqlstr+' and ';
sqlstr:=sqlstr+'...'(职务的条件);
firsttj:=false;
end;
if checkbox3.checked then
begin
if firsttj then
sqlstr:=sqlstr+' and ';
sqlstr:=sqlstr+'...'(户口的条件);
end;
end;