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Editorial Team
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Asked: 2026-05-31T23:50:57+00:00

I have a question regarding the design of two tables. Table 1: The main

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I have a question regarding the design of two tables.

Table 1: The main table, called Batch. Values are added here from parsing files.

Table 2: This table works like a log table, every row that is deleted from table 1 goes here.

Example

Table 1

ID text
1  'bla1'
2  'bla2'
3  'bla3'

Delete row where id is 2 and 3

Table 2

ID  text
2   'bla2'
3   'bla3'

Problem:

What if I insert ID 2 and 3 again in table 1 and deletes it? Table 2 would have same data. How can I fix this? Should I just make ID also identity column? So when I add 2 records it would be this (additional question how do I keep counting if I delete the whole table 1?):

Table 1

ID
4  'Bla3'
5  'Bla4'
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1 Answer

  1. Editorial Team

    Just have a unique identifier for Table 1. This identifier should be unique to this table, not for the data you load. You can then load id 100 from your source file as many times as you want, they should get a unique identifier in the Table 1.

    An Identity Column seems to fit your requirements for this. I’d look into more audit data as well, perhaps store what file it came from, when it was loaded, who loaded it, etc.

    As for filling the log table, you can just attach a trigger on your Table 1 that fills Table 2 with deleted rows, should be pretty straight forward.

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