SELECT COLNAME
FROM syscat.COLUMNS
WHERE tabschema='my_schema_name'
AND tabname='my_table_name'
AND KEYSEQ=1
See also:
How to get primary key of a table from PostgreSQL
How to get primary key of a table from SQLite
How to get primary key of a table from MySQL
How to get primary key of a table from SQL Server
How to get primary key of a table from Oracle
Some DB2 tools you can try: https://www.withdata.com/db2/
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