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It's not even a heart ...
Now there are four kinds of devices, A, B, C, D
I put their data into four watches
Each device has its own unique ID, namely A.ID, B.ID, C.ID, D.ID
Now I want to have a table to store their failure information
Dev_ID may be the value of table A, maybe the value of table B, maybe ...
How to achieve this?
And they are not in the same database, but in the same server
Please help |
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