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Find missing serials

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Last Modified: 2019-12-17
Hello,

How to find a missing sequence Using oracle 8i from a table ?  the purpose I need to assign available sequences automatically for customer accounts, as below example :

Account_no
1
2
4
5
8

results:
1) The result of the query is 3 , when (3) inserted in the table, query should get 6..etc.
2) Also how can I find all missing sequences , result : 3,6,7 using one select?

Thank You
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