Why rows that are in table 2 but have no match in table 1 are dropped after RIGHT JOIN? – Mysql
I need to join two tables: our_sample and tls207_pers_appln from PATSTAT. our_sample' has 4 columns: appln_id, appln_auth, appln_nr, appln_kind. tls207_pers_appln has 4 columns: appln_id, person_id, applt_seq_nr, invt_seq_nr. our_sample has 2191 rows and some (60) of them are missing in tls207_pers_appln.…