I would like to auto-increment within an auto-incremented value.
For example, if I have a rental agreement(auto-incremented) and that rental agreement becomes month-to-month.
I was thinking that I would want to track the receipts as such:
Contract # | Type | Second Auto # | Duration |payment total 1 | 1 | 1 | 6 months| 6,000 1 | 2 | 1 | 1 month | 1,000 1 | 2 | 2 | 1 month | 1,000
As you can see, the contract stays the same (1), but the Contract Type changes to 2(month-to-month). When this happens, the first transaction is reset to auto-increment from that point forward.
The third record illustrates the second auto-incremented #, within the Type #2.
Although I have seen many auto-incremented examples, I have yet to see one that auto-increments within another auto-incremented value.
There's a reason for that. AUTO_INCREMENT doesn't work that way.
What you *can* do is declare a multiple-column index in which the final column is an AUTO_INCREMENT column. What happens then is that, for each set of rows in which the leading index column or columns have the same value, the AUTO_INCREMENT column increase sequentially.
That doesn't seem to match your scenario, however.
Any suggestions or examples would be appreciated. Thanks.
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