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From: Igor Korot <ikorot01@gmail.com>
Date: Sat, 14 Mar 2026 02:09:04 -0500
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 <CA+FnnTz7+dbyk5Gn2iM-eo1Xvfax15yjBevmCCfvo0-UVW1K7Q@mail.gmail.com>
Subject: Does included columns part of the PK
To: "pgsql-generallists.postgresql.org" <pgsql-general@lists.postgresql.org>
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Hi, ALL,
Have one weird question ;-)

When I connect with ODBC and call SQLPrimaryKey() the function returns
all fields including
"included" fields.

However running libpq and trying to get the table info with:

[quote]
    L"SELECT DISTINCT column_name, data_type,
character_maximum_length, character_octet_length, numeric_precision,
numeric_precision_radix, numeric_scale, is_nullable, column_default,
CASE WHEN column_name IN (SELECT ccu.column_name FROM
information_schema.constraint_column_usage ccu,
information_schema.table_constraints tc WHERE ccu.constraint_name =
tc.constraint_name AND tc.constraint_type = 'PRIMARY KEY' AND
ccu.table_name = $2) THEN 'YES' ELSE 'NO' END AS is_pk,
ordinal_position FROM information_schema.columns col,
information_schema.table_constraints tc WHERE tc.table_schema =
col.table_schema AND tc.table_name = col.table_name AND
col.table_schema = $1 AND col.table_name = $2 ORDER BY
ordinal_position;";
[/quote]

I'm getting only direct PK fields.

I presume that libpq is correct and the ODBC driver is the one that
needs to be fixed.

Just wanted to ask this list before going to complain to the ODBC list... ;-)

Thank you.