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@a_horse_with_no_name: Oracle does not directly support the JOIN keyword in an UPDATE, but it allows UPDATE involving JOIN operations between table in at least 2 different ways, look at the accepted answer here: stackoverflow.com/questions/2446764/…

You could create a trigger on table B that updates table A every time field_2 on table B is updated.

Without uniqueness, you are reduced to something like @Paul Karr's loop -- and if there is not a unique correlation, then more than one target row may be updated for each source row.

UPDATE Table1 T1 SET T1= (SELECT T2FROM Table2 T2 WHERE T2= T1.id), T1= (SELECT T2FROM Table2 T2 WHERE T2= T1.id) WHERE T1IN (SELECT T2FROM Table2 T2 WHERE T2= T1.id); The full example is here: beef is in having the columns that you want to use as the key in parentheses in the where clause before 'in' and have the select statement with the same column names in parentheses.

Consequently, to prevent this, you might do this: One potential issue may arise when the subquery actually finds more than one matching row in tbl B.

If this happens, the UPDATE will terminate with an error ("subquery may return only one row").

updating a table in pl sql-84updating a table in pl sql-42

If your table t1 and it's backup t2 have many columns, here's a compact way to do it.

The second syntactical form, called a positioned update, updates one or more columns on the current row of an open, updatable cursor.

If columns were specified in the FOR UPDATE clause of the SELECT statement used to generate the cursor, only those columns can be updated.

Secondly: there is no order by clause so this will occur in an unpredictable manner (i.e. simplest contrived way would be (select min(name)...)Long story short: if you can at all avoid it, never ever EVER use any kind of LOOP in a T-SQL statement.

Personally, if it wasn't for the 0.001% of the time where there's no other solution, I don't even think it should even be an available function in T-SQL.




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