Databases are used to store different kinds of data such as names, currency, text, graphics, etc. Determining the appropriate data type for each attribute is important for database performance, storage size, and conducting accurate analysis on databases. As with other programming languages, SQL supports many data types. However, you will mostly use two categories while writing SQL queries: Characters, and numbers. Consider the following standard SQL data types: Characters char varchar Numbers integer decimal float Different data types could be used for the same attribute. For example, both char and varchar could be used to store “names” in a database. Examine the attributes for the Characters and Numbers data types. Using specific examples, compare data types for each category. For example, why you should choose char rather than varchar or opposite?

Databases are used to store different kinds of data such as names, currency, text, graphics, etc. Determining the appropriate data type for each attribute is important for database performance, storage size, and conducting accurate analysis on databases. As with other programming languages, SQL supports many data types. However, you will mostly use two categories while writing SQL queries: Characters, and numbers. Consider the following standard SQL data types: Characters char varchar Numbers integer decimal float Different data types could be used for the same attribute. For example, both char and varchar could be used to store “names” in a database. Examine the attributes for the Characters and Numbers data types. Using specific examples, compare data types for each category. For example, why you should choose char rather than varchar or opposite?

Programming with Microsoft Visual Basic 2017

8th Edition

ISBN:9781337102124

Author:Diane Zak

Publisher:Diane Zak

Chapter12: Database Queries With Sql

Section: Chapter Questions

Problem 9RQ

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PATHS is a table that contains information about paths on a number line. The structure of PATHS is as follows, where x1 and x2 represent that there is a path from Coordinate x1 to Coordinate x2 (You can't move from Coordinate x2 to Coordinate x1 ). NAME ΤΥΡE NULLABLE X1 INT FALSE X2 INT FALSE Problem Please write an SQL statement that returns the beginning and end point of each path in PATHS . Sort them by the value of the beginning point in ascending order. Constraints • In the case where a direct path from Coordinate a to Coordinate b is available, no path from Coordinate b to Coordinate a will be given. |x1-x2| = 1 • No path will overlap with one another. Example Suppose that PATHS is as follows: x1 x2 1 2 2 3 4 7 7 6 This table can be visualized as follows: START END END START 7 8. 9 Therefore, your SQL statement must return the following: start end 1 4 8 6
In Visual Basic, a double data type would be comparable to what SQL data type.
J SHORTAND NOTATION FOR RELATIONAL SQL TABLES Notation Example Meaning Underlined A or A, B The attribute(s) is (are) a primary key Superscript name of relation AR or AR, BR The attribute(s) is (are) a foreign key referencing relation R As an example, the schema R(A, B, C, D, ES) S(F, G, H) corresponds to the following SQL tables: CREATE TABLE R ( A <any SQL type>, B <any SQL type>, C <any SQL type>, D <any SQL type>, E <any SQL type>, PRIMARY KEY(A), FOREIGN KEY (E) REFERENCES S(F) ); CREATE TABLE S ( F <any SQL type>, G <any SQL type>, H <any SQL type>, PRIMARY KEY(F)) EXERCISE Consider the following relational schema, representing five relations describing shopping transactions and information about credit cards generating them [the used notation is explained above]. SHOPPINGTRANSACTION (TransId, Date, Amount, Currency, ExchangeRate, CardNbrCREDITCARD, StoreIdSTORE) CREDITCARD (CardNbr, CardTypeCARDTYPE, CardOwnerOWNER, ExpDate, Limit)…
Database design Objectives: To understand and be able to write simple SQL queries Instruction: Refer to HR schema to answer the questions Include screenshot of your code and output of each question 1. Write SQL query that displays the last name and salary of employees earning more than $12,000. 2. Write SQL query that displays the last name and department number for employee number 176. 3. Write SQL query to display the last name and salary for all employees whose salary is not in the range $5,000 through $12,000. 4. Write SQL query to display the last name, job ID, and hire date for employees with the last names of Matos and Taylor. Order the query in ascending order by hire date. 5. Display the last name and department ID of all employees in departments 20 or 50 in ascending alphabetical order by name. 6. Write a query that displays the last names of all employees who have both an “a” and an “e” in their last name. 7. Write a query to display the employee…
SBN Title Author 12345678 The Hobbit J.R.R. Tolkien 45678912 DaVinci Code Dan Brown Your student ID DBS311 Your Name use the following statement to Write a PL/SQL Function that accepts 4 parameters, 2 strings representing students names, and 2 integers representing the marks they received in DBS311. The function will determine which student had the higher mark and return the name of the student. If the marks were the same, then return the word "same" and return "error" if an error occurs or the calculation can not be determined.
se SQL program Server2014 ... A company undertakes a number of projects, the employees work on it, and during the process of analyzing the system we found the following points: The company is made up of a number of departments (the department number, which is a single number, the name of the department, the department's website) There are employees (the employee's number is a single number, his name, address, salary, and job) The employee belongs to one department only, and each department has more than one employee. There are projects (the project number, which is a single number, the name of the project, the project site) Each project has a specific department that it manages, and the department may manage it more than one project. More than one employee works in the project, and the employee may work in more than one project. Each employee has a number of work hours per week in each project. Required: 4. Create a Trigger that indicates the end of the entry operation on any of…
True or False: SQL provides built-in functions for string manipulation, date and time operations, and mathematical calculations.
In SQL Server, character data types may be distinguished as follows: NVARCHAR, NVARCHAR, and NVARCHAR.
SQL is a declarative language means that (a) it allows describing the algorithm to carry out the desired query (b) variables are declared (c) it allows describing the desired query but not the algorithm to carry out it (d) none of the answers are correct
Database: CUSTOMER (CustomerID, LastName, FIrstName, Phone, EmailAddress) PURCHASE (InvoiceNumber, InvoiceDate, PreTaxAmount, CustomerID) PURCHASE_ITEM (InvoiceNumber, InvoiceLineNumber, Item Number, RetailPrice) ITEM (ItemNumber, ItemDesciption, Cost, ArtistLastName, ArtistFirstName) Write an SQL statement to show which cutomers bought which items, and include any items that have not been sold. Include CUSTOMER.LastName, CUSTOMER.FirstName, IvoiceNumber, InvoiceDate, ItemNumber, ItemDescription, ArtistLastName, and ArtistFirstName,. Use a join using JOIN ON syntax, and sort the results by ArtistLastName and ArtistFirstName in ascending order. Note that in Microsoft Access this require multiple queries. From Database Concepts 9th Ed. (Kroenke)
SQL is capable of implementing components of other programming languages.
relation: Book (BookID, Author, ISBN, Title) Write a PL/SQL block of code that performs the following tasks: Read a Book id provided by user at run time and store it in a variable. Fetch the Author and title of the book having the entered id and store them inside two variables Display the fetched book author and title.