Adventureworks database 2016
Adventureworks database 2016 install#
The only differences between the various versions of AdventureWorks are the name of the database and the database compatibility level.įor additional guidance, please review the instructions for attaching a database and restoring a database.įor a sample database leveraging more recent features of SQL Server, see WideWorldImporters.įor install instructions, see the Readme.įor the multidimensional and tabular models, see AdventureWorks for Analysis services. Note that AdventureWorks has not seen any significant changes since the 2012 version.
Adventureworks database 2016 full#
NOT EXISTS would NOT be a direct null check, because NULLABILITY was not evaluated directly.These downloads are scripts and full database backups (.bak) files that you can use to install the AdventureWorks (OLTP) and AdventureWorksDW (data warehouse) sample databases to your SQL Server instance. There are other ways to query for the same results, such as using NOT EXISTS. Using Count in the filter criteria over that null column and recognising that a Count with a zero result means that the ProductID column was in fact null means you have evaluated a null check. By using LEFT JOIN (or OUTER joins) you have created a result set that will have the field PP.ProductID with a value of NULL If there are no products. That up to the interpretation, I think in this case the answer is yes. You do not need to output a column so that you can use it in a filter criteria, so remove COUNT(PP.ProductID) AS 'Products' unless you have been otherwise instructed to use it. While your query looks like it would return the vendors with no products, it is also returning a count of zero. It looks like your answer to Question 1 is pretty good. Use of Aggregation functions, aggregates will generally omit null values, COUNT will return 0 if all values are NULL, where as other aggregates such as SUM, MIN, MAX, AVG will return NULL if all values are NULLĬlearly you have implemented a NULL check because you have evaluated criteria directly on the nullable column. This is a good discussion on all supported joins: LEFT JOIN vs.
This will return results from the left table, even if there are no matching records in the joined or right table. Use this if you need to omit records that have a null in the foreign key field. INNER JOIN will limit the results to only records that match in both tables.Use of JOIN syntax to deal with data that may have nulls. You directly compare against null using IS NULL or IS NOT NULL in your query Null checks can be summarised into 3 patterns: If the results from your queries are correct, then the only issue is "have you done any null checks"? One could say that if your results have returned the correct results then you must have satisfied the criteria, otherwise the question wasn't formulated very well. Have you run your queries? Do you think the results are correct? Please try not to post direct Assignment questions online as you will easily get done for plagiarism by most academic assignment checkers, mainly because other students may see your post, and the support that you get from the community which could result in all of you handing in the same result. Even though this is the Adventure Works DB, you should start your SO journey with good habits!
In the future, please post a summary or create table statements that represents the schema of the tables used in your queries so that we have enough information to provide more than speculative responses. Production.Product AS PP ON PP.ProductID = PPV.ProductID Purchasing.ProductVendor AS PPV ON PV.BusinessEntityID = PPV.BusinessEntityID Below is the syntax I used, am I doing a null check here? SELECT WHERE OnlineOrderFlag = 0 AND CreditCardID IS NULLĪssignment 2 question: list the vendors that have no products. Below is the syntax i used, am i doing a null check here? SELECT SalesOrderNumber
Note: 0 is false and 1 is true for bit fields. Any help is appreciated.Īssignment 1 question: Create a list of the sales order numbers for orders not ordered online and not with a credit card. I am working on 2 different assignments where I have to do null checks but I'm not sure if I have written the syntax correctly for that my instructor has not really discussed this but will be marking for it.īelow are the 2 questions and what I have written.