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For any SQL Server Performance Tuning Issue send an email at [email protected] is also a Cross Fit Level 1 Trainer (CF-L1) and Cross Fit Level 2 Trainer (CF-L2). In some databases, such as Postgre SQL, when a FROM clause is present, what essentially happens is that the target table is joined to the tables mentioned in the fromlist, and each output row of the join represents an update operation for the target table.When using FROM, one should ensure that the join produces at most one output row for each row to be modified.Should any right be infringed, it is totally unintentional.Drop me an email and I will promptly and gladly rectify it.When you look at this it looks very simple but when we try to think the solution, I have seen developers coming up with many different solutions for example sometime they write cursor, table variables, local variables etc.
There are 3 syntaxes for the UPDATE statement depending on whether you are performing a traditional update or updating one table with data from another table.
On the left-hand side of the window that pops up, choose the “SQL Editor” section.
On the right-hand side, scroll down to get to the box that says, “Safe Updates”.
As you can see that using JOIN clause in UPDATE statement it makes it very easy to update data in one table from another table.
You can additionally use MERGE statement to do the same as well, however I personally prefer this method.