I think that all previous answers are correct, this below code is very valid specially if you have to update multiple rows at once, note: it's PL/SQL
DECLARE
CURSOR myCursor IS
Select contacts.BusinessCountry
From contacts c WHERE c.Key = t.Key;
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BEGIN
FOR resultValue IN myCursor LOOP
Update tblindiantime t
Set CountryName=resultValue.BusinessCountry
where t.key=resultValue.key;
END LOOP;
END;
I wish this could help.