I have a table zipnames
with four columns: id
, zipcode
, name_fi
and name_sv
. Both of the name_*
columns are nullable. For each possible zipcode
, I might have up to four rows: both names present, only name_fi
present, only name_sv
present, or both null.
How can I write a SELECT
for this table so that I can get only one row back for each zipcode
, prioritizing rows with both languages present, then rows with only one language, and only returning nulls for both languages if we really don’t have a row with either name?
If it makes a difference, I’m working with PostgreSQL v14, and using SQLAlchemy in Python. Feel free to answer either in plain SQL or as SQLAlchemy code.
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