Update A Set Of Records In One Single Query
My records contain a position, from 1 to n. This position is not the primary key.
In normal conditions, the position of this records should be as follows:
1, 2, 3, 4, 5, 6, 7, 8, 9 . etc...
One of my utitities is meant to check the consistency of the table -
one of the things it has to do is scan the table as follows:
SELECT position FROM employe_records WHERE employe_id = ? ORDER BY position
From the result of this query I verify each entry (JDBC) one by one, looking for inconsistancies. In a for() loop I look at the value of position and check that they start from 1 and are incremented by one for each record.
At the first inconsistency I come accross I want to run a query to update the records so it is consistant again - it is something like this:
UPDATE employe_records SET position = updatedValue FROM
employe_records WHERE employe_id = ? ORDER BY position
This is not valid query of course - my question is what should my query look like?! How can I make 'updatedValue' incremented by one automatically so each of the records are updated from 1 to n.
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How Can I Update A Set Of Records In One Single Query
My records contain a position, from 1 to n. This position is not the primary key. In normal conditions, the position of this records should be as follows: 1, 2, 3, 4, 5, 6, 7, 8, 9 .etc... One of my utitities is meant to check the consistency of the table - one of the things it has to do is scan the table as follows: SELECT position FROM employe_records WHERE employe_id = ? ORDER BY position From the result of this query I verify each entry (JDBC) one by one, looking for inconsistancies. In a for() loop I look at the value of position and check that they start from 1 and are incremented by one for each record. At the first inconsistency I come accross I want to run a query to update the records so it is consistant again - it is something like this: UPDATE employe_records SET position = updatedValue FROM employe_records WHERE employe_id = ? ORDER BY position This is not valid query of course - my question is what should my query look like?! How can I make 'updatedValue' incremented by one automatically so each of the records are updated from 1 to n.
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