[postgis-users] A function to find errors in groups in a table

[Shaozhong SHI]

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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