Is it possible to update a field in one table depending on a condition of a field in another? If so how is this done?
Yes, but the exact syntax will depend on your particular database system.
For example, in SQL Server:
update table1 set fldX = T2.fldY from table1 T1 inner join table2 T2 on T1.keyfld = T2.keyfld where T2.fldZ = 'foo'
... whereas in Microsoft Access:
update table1 inner join table2 on table1.keyfld = table2.keyfld set table1.fldX = table2.fldY where table2.fldZ = 'foo'
Just another example of different databases implementing the same thing in different ways.
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