| From: | Shaozhong SHI <shishaozhong(at)gmail(dot)com> |
|---|---|
| To: | pgsql-sql <pgsql-sql(at)lists(dot)postgresql(dot)org> |
| Subject: | A function to find errors in groups in a table |
| Date: | 2022-06-09 13:37:27 |
| Message-ID: | CA+i5JwZCt0c1V-LexLo50Oa+r_UVLM26ZQ4pqq2d9XYaBebKjA@mail.gmail.com |
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| Lists: | pgsql-general pgsql-sql |
There is a table full of grouped values like the following
nodeid link_type primary
11 outflowlink 1
11 inflowlink 1
11 outflowlink 2
Primary of 1 indicates a primary water course. Primary of 2 indicates a
secondary water course.
Obviously, one of the out flow links is an error, as its primacy value is
2. It is wrong that water flows from a primary water course into a
secondary water course.
How can a function can be designed to find and report such errors?
Regards,
David
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