"Name not unique in this context",是什么原因？(100分)

附上原码：
unit getinUnit;

interface

uses
Windows, Messages, SysUtils, Classes, HTTPApp, WebModu, HTTPProd,
WebComp, WebAdapt, CompProd, PagItems, SiteProd, MidItems, WebForm;

type
Tgetin = class(TWebPageModule)
AdapterPageProducer: TAdapterPageProducer;
Adapter1: TAdapter;
f_msisdn: TAdapterField;
f_password: TAdapterField;
a_get: TAdapterAction;
AdapterForm1: TAdapterForm;
AdapterFieldGroup1: TAdapterFieldGroup;
AdapterEditColumn: TAdapterEditColumn;
AdapterEditColumn2: TAdapterEditColumn;
AdapterCommandGroup1: TAdapterCommandGroup;
dl: TAdapterActionButton;
procedure f_msisdnGetValue(Sender: TObject; var Value: Variant);
procedure f_passwordGetValue(Sender: TObject; var Value: Variant);
procedure Adapter1BeforeExecuteAction(Sender, Action: TObject;
Params: TStrings; var Handled: Boolean);
procedure a_getExecute(Sender: TObject; Params: TStrings);
private
{ Private declarations }
public
{ Public declarations }
m_msisdn,m_password,temp_passwd,m_cusid:string;
end;

function getin: Tgetin;

implementation

{$R *.dfm} {*.html}

uses WebReq, WebCntxt, WebFact, Variants, dmUnit;

function getin: Tgetin;
begin
Result := Tgetin(WebContext.FindModuleClass(Tgetin));
end;

procedure Tgetin.f_msisdnGetValue(Sender: TObject; var Value: Variant);
begin
Value:=m_msisdn;
end;

procedure Tgetin.f_passwordGetValue(Sender: TObject; var Value: Variant);
begin
Value:=m_password;
end;

procedure Tgetin.Adapter1BeforeExecuteAction(Sender, Action: TObject;
Params: TStrings; var Handled: Boolean);
begin
if Assigned(f_msisdn.ActionValue) then
m_msisdn:=f_msisdn.ActionValue.Values[0];
if Assigned(f_password.ActionValue) then
m_password:=f_password.ActionValue.Values[0];
end;


procedure Tgetin.a_getExecute(Sender: TObject; Params: TStrings);
var
source,dest,schar;
i,len,cnt,li_loop,nn,n1,n2,n3,n4:Integer;
cc,c1,c2,c3,c4:char;
begin

dm.Query1.Active:=false;
dm.Query1.SQL.Clear;
dm.Query1.SQL.Add('select passwd from bsn_customer,bsn_user_gsm where');
dm.Query1.SQL.Add('bsn_customer.cusid=bsn_user_gsm.cusid and');
dm.Query1.SQL.Add('bsn_user_gsm.msisdn=');
dm.Query1.SQL.Add(m_msisdn);

dm.Query1.Active:=true;

temp_passwd:=dm.Query1.FieldByName('passwd').Value;

Getmem(source,sizeof(char)*40);
Getmem(dest,sizeof(char)*40);
Getmem(s,sizeof(char)*40);

strCopy(source,@temp_passwd);
len:=strlen(source);
cnt:=len div 4;
for li_loop:=0 to cnt-1 do
begin
strcopy(s,source);
cc:=chr($00);
c1:=chr($00);
c2:=chr($00);
i:=3;
while (i<>0) do
begin
n2:=ord(c2) shl 2;
c2:=chr(n2);
cc:=s[li_loop*4+i];
nn:=ord(cc);
n4:=nn and $41;

case n4 of
65:n1:=0;
1:n1:=1;
64:n1:=$02;
0:n1:=$03;
end;


n2:=n1 or n2;
i:=i-1;
end;

n3:=not n2;
c3:=chr(n3);
dest[li_loop]:=c3;
dest[li_loop+1]:=chr($00);
end;


if m_password=dest^ then

dl.PageName:='querypage'

else

dl.PageName:='wrongpage';
end;

initialization
if WebRequestHandler <> nil then
WebRequestHandler.AddWebModuleFactory(TWebPageModuleFactory.Create(Tgetin, TWebPageInfo.Create([wpPublished {, wpLoginRequired}], '.html'), crOnDemand, caCache));

end.

在某个地方出现了重名的变量。

难道别的高手们就没有看法了吗？

dm.Query1.Active:=false;
dm.Query1.SQL.Clear;
dm.Query1.SQL.Add('select passwd from bsn_customer,bsn_user_gsm where');
dm.Query1.SQL.Add('bsn_customer.cusid=bsn_user_gsm.cusid and');
dm.Query1.SQL.Add('bsn_user_gsm.msisdn=');
dm.Query1.SQL.Add(m_msisdn);
Passwd字段可能在bsn_customer,bsn_user_gsm两个表中都有,所以必须指明是从哪个表中取

dm.Query1.Active:=false;
dm.Query1.SQL.Clear;
dm.Query1.SQL.Add('select bsn_customer.passwd from bsn_customer,bsn_user_gsm where');
dm.Query1.SQL.Add('bsn_customer.cusid=bsn_user_gsm.cusid and');
dm.Query1.SQL.Add('bsn_user_gsm.msisdn=');
dm.Query1.SQL.Add(m_msisdn);

如果bsn_user_gsm.msisdn是一个字符串字段或者日期字段的话必须加引号:
dm.Query1.SQL.Add('bsn_user_gsm.msisdn=');
dm.Query1.SQL.Add('"'+m_msisdn+'"');

你的意思我明白，可是在ORACLE中，引号是可加可不加的，而且该错误信息“Name not unique in this context
不是从ORA数据库返回的！

是BDE别名的问题

多人接受答案了。