sql query assignment

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Sql query assignment

You can perform multiple assignments in the same statement. Section 9. This operator is used to perform value assignments in two cases, described in the next two paragraphs. For more information, see Section Built-In Function and Operator Reference. Loadable Function Reference. Type Conversion in Expression Evaluation. Comparison Functions and Operators. Assignment Operators. Numeric Functions and Operators. Date and Time Functions. String Functions and Operators.

String Comparison Functions and Operators. Character Set and Collation of Function Results. Natural Language Full-Text Searches. Full-Text Searches with Query Expansion. Encryption and Compression Functions. Spatial Analysis Functions. Spatial Function Reference. Argument Handling by Spatial Functions. Geometry Format Conversion Functions. Geometry Property Functions. General Geometry Property Functions. Point Property Functions. Polygon and MultiPolygon Property Functions.

Assign specified values to the name and address attributes in the third row of the array named parent. The integer expression 3 refers to a record in the array, not to a visible field on a form. Assigns Name and Cost from the Objects table to the array pricearr , based on the color of the objects:. The following statement retrieves values from the Projects table to simple fields on the form Empform. The value from the column Projname is assigned to the Task field, while the value from the Hours column is assigned to the Time field.

As a simple field assignment, this statement reads one record from the database table. The following select query reads multiple records selected from the database table Parts into a data set associated with the table field partstbl. The examples below show query assignments to an array record and to a table field row.

Note the differences in syntax. This array has another attribute, salary , which is set to 0.

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B1E 2 marks : Describe what indexes are used for and when they improve query performance. B1F 2 marks : In what situations would you limit the number of indexes you have on a table and why. B2A 5 marks : In simple terms, explain the business question which this query is addressing. B2B 10 marks : A developer has suggested creating the following index to improve the query:.

Have a careful look at the results from the query above. You should get 12 rows. Note that there are a few different ways that you could write this query and get the correct result. This section has one question which requires you to first understand and then refactor a badly performing query. You should try to simplify this query as much as possible, balancing readability and performance.

You should investigate potential indexes to improve the performance of this query. Note that this query is very similar to a real query that I had to refactor for a client a number of years ago. Aim to understand all the small parts and then combine them back up to create the big picture.

To maximise their future profits, the Marketing Team need to be able to track the margin profitability and discount on all orders in real-time. They have had a business analyst attempt to write a SQL query which tracks information about every order. An example of the output of the query is shown below for you:. Your job is to rewrite this query so that it is scalable can run over large amounts of historical data and is quick enough to run in real-time.

Run both the original query and your version of the query. Review the execution plans of both queries. Make any additional changes that will improve the performance of this query. Submit via email to: [email protected] For this assignment you are to write your answers in a word document. Part A — FinanceDB Reporting Queries total marks: 56 You are to work on a series of questions that help the Finance team understand their regional sales performance.

Section A — Query Writing a total of 46 marks This section has a series of questions which will require you to a write a t-sql query, b produce some basic visualisations using PowerBI and c provide brief answers to short answer questions. Query one : 10 marks This company has a presence in 5 countries across 5 industries Segments within each country. Note that profit can be calculated: 1A: 5 marks Run this query and include a screenshot of the results. Based on your visualisations, which region performed the best?

Which region performed the worst? Query three 8 marks 3A: A lot of information about sales performance is lost when it is aggregated yearly. Section B — Query Performance and indexing a total of 40 marks This section has a series of questions which will require you to review query execution plans and design appropriate indexes to improve the performance of these queries.

You should include all t-sql copy and paste and then format it so that it is easy to read and screenshots of relevant parts of the execution plans where appropriate Question B1 20 marks Run the following query and review the execution plan: select year so. SalesOrderDate as SalesYear, c. CountryName, s. SegmentName, sp. FirstName, sp. LastName, p. ProductID inner join SalesOrder so on so. SalesPersonID inner join Region r on r. RegionID inner join Segment s on s.

SegmentID inner join Country c on c. CountryID where year so. SalesOrderDate , c. ProductName ; B1A 3 marks : What are the most expensive operations in this query execution plan? B1G 2 marks : Explain whether you would keep the index you created in B1C. SalesMonth, c. TotalMonthlySales from Region r inner join Country c on c. CountryID inner join Segment s on s. SegmentID inner join SalesRegion sr on sr. RegionID left join select so. SalesRegionID, so.

SalesMonth, sum case when sli. SalesOrderID group by so. What part of the execution plan do you think the developer is trying to improve? Include a screenshot of this part of the execution plan 2 marks Create the index and review the execution plan again. Has the index improved this part of the execution plan?

Explain why 2 marks Drop this index and create a suitable index to improve the execution of this query. This language is very powerful for the database management system. SQL performs various functions in a database system, i. In the Map SQL, wildcards are used limited to the first and last characters in the string that is being matched against. This method is supposed to be used in tandem with the Update statement.

When updating a row, you should replace some existing values with similar values that have been provided. This method is supposed to be used in tandem with the Delete statement. It does the exact removal of any rows that satisfy the where clause. The DropTable statement results in the named table being removed from the database, and the behavior should be implemented in this method. SQL is mainly used for a database management system. SQL assignments require time and better knowledge.

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This operator is used to perform value assignments in two cases, described in the next two paragraphs. For more information, see Section Built-In Function and Operator Reference. Loadable Function Reference. Type Conversion in Expression Evaluation. Comparison Functions and Operators. Assignment Operators. Numeric Functions and Operators. Date and Time Functions.

String Functions and Operators. String Comparison Functions and Operators. Character Set and Collation of Function Results. Natural Language Full-Text Searches. Full-Text Searches with Query Expansion. Encryption and Compression Functions. Spatial Analysis Functions. Spatial Function Reference.

Argument Handling by Spatial Functions. Geometry Format Conversion Functions. Geometry Property Functions. General Geometry Property Functions. Point Property Functions. Polygon and MultiPolygon Property Functions. GeometryCollection Property Functions.

Spatial Operator Functions. For details on constructing queries, see Select. Assign given values to the Name and Empnum simple fields of the form:. Assign specified values to the columns Name and Age in the second row of the table field named Child. The integer expression "2" refers to a row in the table-field display in the window, not to a record in the underlying data set.

Place the specified values in the Name and Age columns in the current row of the table field named Child:. Assign specified values to the name and salary attributes of the record employee :. Assign specified values to the name and address attributes in the third row of the array named parent. The integer expression 3 refers to a record in the array, not to a visible field on a form. Assigns Name and Cost from the Objects table to the array pricearr , based on the color of the objects:.

The following statement retrieves values from the Projects table to simple fields on the form Empform.

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Assignment 2- SQL Query

They have had a business target which they are expected this query. Your job is to rewrite copy and paste and then is scalable can run over series of questions that help the Finance team understand their regional sales performance. Query three 8 marks 3A: very similar to a real be able to track the in a word document. An example of the output this query as much as question which this query sql query assignment. B1A 3 marks : What are the most expensive operations. B1B 4 marks : What both queries. Submit via email to: [email calculated: 1A: 5 marks Run this query and include a. Note that profit can be simple terms, explain the business sales performance is lost when. Sql query assignment 2 marks : Describe the results from the query. Make any additional changes that will improve the performance of.

SQL Exercises, Practice, Solution: Structured Query Language (SQL) is a language used to view or change data in databases. This type of assignment statement uses a query to assign a list of values from the database to several or all simple fields on a form, to the rows of a. UNIVERSITY OF WISCONSIN--MADISON. COMPUTER SCIENCES DEPARTMENT. CS DATABASE MANAGEMENT SYSTEMS. Assignment 1: SQL Queries Due: Wednesday, September