diff --git a/doc/src/sgml/ref/update.sgml b/doc/src/sgml/ref/update.sgml index 3a0285df793..2ab24b0523e 100644 --- a/doc/src/sgml/ref/update.sgml +++ b/doc/src/sgml/ref/update.sgml @@ -387,23 +387,23 @@ UPDATE employees SET sales_count = sales_count + 1 WHERE id = Update contact names in an accounts table to match the currently assigned - salesmen: + salespeople: UPDATE accounts SET (contact_first_name, contact_last_name) = - (SELECT first_name, last_name FROM salesmen - WHERE salesmen.id = accounts.sales_id); + (SELECT first_name, last_name FROM employees + WHERE employees.id = accounts.sales_person); A similar result could be accomplished with a join: UPDATE accounts SET contact_first_name = first_name, contact_last_name = last_name - FROM salesmen WHERE salesmen.id = accounts.sales_id; + FROM employees WHERE employees.id = accounts.sales_person; However, the second query may give unexpected results - if salesmen.id is not a unique key, whereas + if employees.id is not a unique key, whereas the first query is guaranteed to raise an error if there are multiple id matches. Also, if there is no match for a particular - accounts.sales_id entry, the first query + accounts.sales_person entry, the first query will set the corresponding name fields to NULL, whereas the second query will not update that row at all.