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Cannot add or update a child row: a foreign key constraint fails - when not all lookup table inputs

Thread began 1/07/2014 6:21 pm by david_allen | Last modified 1/31/2014 4:59 pm by david_allen | 1455 views | 10 replies

Jason ByrnesWebAssist

in the table don't define the foriegn jeys.


you use the column as a foreign key by using the primary key values to create the relationship.


the probelm is that you have defined the keys in the tables.

the only keys needed in the tables are the primary keys.


take this example:

products:
productID - Primary Key
productName
etc

categoris:
categoryID - Primary Key
categoryName

productcategories
productcatagoryID - Primary Key
productcatagoryProductID - relates to products.productID (but do not define a foreign key)
productcatagoryCategoryID - relates to categoris.categoryID (but do not define a foreign key)

no foreign key needs to be defined, but it can still be used as a foreign key by storing the productID and categoryID to create the relationship.

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