Sql updating table from same table

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The SQL Server (Transact-SQL) UPDATE statement is used to update existing records in a table in a SQL Server database.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.Something like this: I really hated that I was using two SQL statements and all that declaring to do a simple update, so I looked up the syntax for the UPDATE statement. So I tried this: I used the same table to update and to alias and it seemed to work.It said that if I want to update a table from a source I need to use the FROM keyword, like this: As you can see, we use an alias to name another table or query, we use the Alias name for all the conditions for that table and nothing for the conditions on the table we update. However, the number of updated columns was always 0.Thanks The answer is very simple in ANSI SQL JOINs are not updatable but Subqueries are so see if you can convert the JOIN to a Subquery.

sql updating table from same table-90

That information, along with your comments, will be governed by DISQUS’ privacy policy.You will be given questions that you need to solve.After each exercise, we provide the solution so you can check your answer. This is a self join which allows us to update a set of values in a table with a different set of values from the same table.No WHERE conditions are needed since the conditions are handled in the ON clauses.

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