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"free" ip number when I remove device from database?
Access 2007. Problem is when I delete the device (which has foreign
key, ipID) from device table the IP number from IP table (has ID, primary key) also deletes (relation 1:1). I want to "free" ip number when I remove device from database so IP number is not deleted and can be used later. How to accomplish this? Form looks for "free" addresses as follows: SELECT tblIP.ID, [ip] & "." & [ip2] & "." & [ip3] & "." & [ip4] AS [IP- number], tblDevice.ipID FROM tblIP LEFT JOIN tblDevice ON tblIP.ID = tblDevice.ipID ORDER BY tblIP.ip, tblIP.ip2, tblIP.ip3, tblIP.ip4 WHERE (((tblDevice.ipID) Is Null)); |
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