问题
I have read numerous thread on the above question, but none of the answers satisfy the problem. My problem is two tables that are linked to each other (in a one to one relationship) using an "ID" field which is also the primary key. When I try to enter a record in the the main table (Don't know if Access knows this is the main table) the I get the following error:
"You cannot add or change a record because a related record is required in table"
Could anyone please help me with this?
Thanks
回答1:
The issue seems to be occuring because you are trying to set the primary key of your table as a foreign table.
What you need to do is create a new column in the 2nd table and link it to the id of the first table, therefore creating a relationship.
Let's take the following simple example since you haven't mentioned the names given to your tables.
In a university environment, you would have the table LECTURER which is linked to the table SUBJECT, so that a lecturer can teach a subject. The relationship between the 2 tables would be so:
LECTURER TABLE
LECTURER_ID | LECTURER_NAME | LECTURER_ADDRESS
SUBJECT TABLE
SUBJECT_ID | SUBJECT_NAME | SUBJECT_DESCRIPTION | SUBJECT_LECTURER_ID
The link between these two tables would be between the SUBJECT_LECTURER_ID from the SUBJECT table and the LECTURER_ID from the LECTURER table. This is a one to one relationship since we are assuming that each subject in this particular university is only taught by one lecturer, and a lecturer can only teach one single subject.
Hope this helps :)
回答2:
A "One-To-One" relationship is really a One-To-Zero_or_One relationship, but the table diagrams on the Relationships page in Access do not make it clear which table is the "parent":
However, if you right-click on the line joining the tables and choose "Edit Relationship..." you will see
In this case [Table1] is the "parent" table and [Table2] is the "child" ("Related") table, so we must insert a row into [Table1] before trying to insert the corresponding row into [Table2].
来源：https://stackoverflow.com/questions/26573293/not-allowed-to-create-or-change-a-record-in-ms-access