If you try to update multiple columns from multiple tables, an error message will appear. I hope you enjoyed this article. View All. Onkar Sharma Updated date Dec 29, A single update statement cannot be used to update multiple columns from different tables. Users can also use the SQL alias instead of the table name.
SET Next, specify the new value for the column of the updated table. The resultset does not change for either of these syntaxes. In this example, we will consider the breakfast menu example again, which we mentioned in the earlier part of the article.
Firstly, we will create the two-sample tables which contain the drink and meal names. After then, we will populate them with some sample data. Tip: The resultset row count will equal to multiplication of tables row counts that will be joined.
For the breakfast menu example, the Meals table row count is 3 and the Drinks table row count is 3, so the resultset row count can find with the following calculation.
Thus, we can create a more meaningful breakfast menu resultset. We try to say that these queries have a high potential to consume more resources and can cause performance issues.
In the generated actual execution plan, we will see a Nested loops operator and when we hover over the mouse on this operator, the detail pop-up window will appear. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually.
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