oracle desc table primary key
-- Primary key in a table SELECT * FROM ALL_CONSTRAINTS -- or DBA_CONSTRAINTS or UESR_CONSTRAINTS WHERE TABLE_NAME= 'table_name' AND CONSTRAINT_TYPE = 'P'; -- With columns names: SELECT c.OWNER, c.TABLE_NAME, c.CONSTRAINT_NAME, c.CONSTRAINT_TYPE, col.COLUMN_NAME FROM ALL_CONSTRAINTS c JOIN ALL_CONS_COLUMNS col ON c.TABLE_NAME = col.TABLE_NAME AND c.CONSTRAINT_NAME = col.CONSTRAINT_NAME WHERE c.TABLE_NAME= 'table_name' AND c.CONSTRAINT_TYPE = 'P' ORDER BY c.TABLE_NAME, c.CONSTRAINT_NAME, col.COLUMN_NAME;