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There are technical reasons why to use one over the other, but being that I am usually just interested in performance I am more concerned with which one will be faster and use fewer resources.In this tip we will compare the performance of these two temporary objects using a few straightforward scenarios. To update a DB Table variable value during the test run anyway, you can use the following workaround: def Update DBTable Var(): # Get an initial DB Table variable value v = Project. Variables.initial DBTable Var = new DBTable Var; # ... Variables.initial DBTable Var ' Assign the new variable's value back to the initial variable ' The initial variable value will be updated Project. Variables.initial DBTable Var; // Assign the new variable's value back to the initial variable // The initial variable value will be updated Project. Next(); end;end; A DB Table variable gets data from the specified source when you first access the variable in your test. If the source is modified, the variable value will not be updated. Variables.initial DBTable Var; # Assign the new variable's value back to the initial variable # Initial variable value will be updated Project. ' Create a new DB Table variable and assign the value of the initial DB Table variable to it Call Project. Add Variable("new DBTable Var", "DB Table") Set new DBTable Var = Project. Variable By Name("new DBTable Var") Set new DBTable Var = Project. // Create a new DB Table variable and assign the value of the initial DB Table variable to it Project. Add Variable('new DBTable Var', 'DB Table'); new DBTable Var := Project. Variable By Name('new DBTable Var'); new DBTable Var := Project.Unlike the majority of the other data types in SQL Server, you cannot use a table variable as an input or an output parameter.

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The restricted scope of a table variable gives SQL Server some liberty to perform optimizations.Because of the well-defined scope, a table variable will generally use fewer resources than a temporary table.If you've been a DBA for any amount of time I'm sure you've been asked the question: Which is better to use, a temp table or a table variable?Also I couldn't think of any conflict that it can have with the rest of the T-SQL syntax.Anyway, if you know any solution to do update like this in one query, I will be thankful if you shear it.




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