ms-access - Query input must contain atleast one table or query

Question

I have a query in access that is suppose to check whether the item already exists in the database before inserting it:

INSERT INTO FinalizedPrintedStickers
Values('0000846043-481-9-0',
'48IG - 1F Straight Panel                                                        ',
'481                               ',
'0',
'0',
'',
'210',
'Printed')
 WHERE NOT EXISTS(SELECT [SN] FROM FinalizedPrintedStickers Where SN = '0000846043-481-9-0')

Now, I've gotten this error before but usually it's when there's no table for example if you "select * from test table" and you type "Select *" and leave out the from clause you get the same error. But I have a table ? Perhaps my where not exists syntax is wrong?

Edit:

Ok, I've added a table "Dual" as suggested with code copy pasted from this question : Table-less UNION query in MS Access (Jet/ACE)

Attempting to add a constraint as shown gave me this error :

after i press ok it highlights the word "Check"

I've never really dealt with constraints (in access atleast..) my syntax is probably wrong

Edit 2:

Adding constraints using ctrl G command

And when I press enter...

Adding constraints using ADO:

And when i press run...

Answer 1

这是Dual表格可以提供帮助的情况之一。表是一个Dual单行表，当您并不真正需要源表但 SQL 解析器坚持存在时，可以在查询的 FROM 子句中使用它。

一些数据库系统（例如，Oracle）提供了一个Dual虚拟表作为“标准设备”，但在 Access 中我们需要创建自己的。有关该过程的出色描述，请查看 HansUp在此处的回答。

因此，一旦您的 [Dual] 表就位，即

id
--
 1

...然后您可以使用此查询执行您的 INSERT（或不...）：

INSERT INTO FinalizedPrintedStickers
    (
        SN,
        Field2
    )
    SELECT 
        "0000846043-481-9-0" AS SN,
        "48IG - 1F Straight Panel" AS Field2
    FROM Dual
    WHERE DCount("SN","FinalizedPrintedStickers","SN=""0000846043-481-9-0""")=0

Answer 2

试试这个，你可以使用简单的 where 子句

INSERT INTO FinalizedPrintedStickers
    Values('0000846043-481-9-0',
    '48IG - 1F Straight Panel                                                        ',
    '481                               ',
    '0',
    '0',
    '',
    '210',
    'Printed')
     WHERE SN Not In(SELECT [SN] FROM FinalizedPrintedStickers Where SN = '0000846043-481-9-0');