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Updating sql tables when joined
If you change your View, like adding or removing a column, you will need to fetch the changes in the View into SQL Spreads.
You do that by closing and re-opening the SQL Spreads Design mode by clicking the Design mode button in the SQL Spreads ribbon in Excel.
When the table was created in the first example column nullability was explicitly defined.
In the second example it was just left to the expression and by default this would result in a NULL definition.
It doesn't happen all that often (most of my SQL is fairly simple), but every now and then someone shows me something that just rocks my world, whether it be the power of Indexing or just something as simple as using UNION ALL instead of UNION.
Last week, John Eric dropped a bomb shell on me, demonstrating how to update a table in conjunction with a SQL JOIN statement.
This can often prove to be a win/win situation as not only will your code be compliant but it will often execute faster on SQL Data Warehouse. This can lead to subtle variances in values if you aren't careful.
This is as a result of its fully parallelized design. Dim Product p RIGHT JOIN dbo.stg_Dim Product s ON p. Try the following as an example: The value stored for result is different.
Notice how the SQL UPDATE statement is JOINing the @boy, @girl, and @relationship table using INNER JOINs and limiting it to boys who have dated Winona Ryder. That was before I knew you could do a FROM clause in the UPDATE statement. I don't think one is necessarily better than the other - they do different things. The trick is to know when to leverage the powers of each tool. Although, I'll admit upfront that my measurement process consists of running the app and saying "Well, that seemed a lot faster".
The update is made to the result of that JOIN and then we are selecting all the rows from that updated @boy table (to see that it works). This should make things much easier, especially when dealing with an UPDATE that uses a sub-query. :) @Matt, If you think about applications from a "user experience" standpoint, it's the "that runs faster" moment much more important than any numeric reading?
I have known for a long time that you could update a SQL View in Microsoft SQL Server (back when I used to use Views), so it makes sense that you could update a JOIN, but it never occurred to me to try this.
Not only did it not occur to me, but the syntax used to do this is very strange to me (although now that I have stared at it for a long time, it's starting to make more sense).