If a table in a SQL database has a column of type `VARCHAR(100), what does the 100 signify? a) The number of records that can be stored in the column. b) The number of unique characters that can be stored in the column. c) The maximum length of a string that can be stored in the column. d) The minimum length of a string that can be stored in the column.
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- What is a NULL value?**In SQL** Write a SELECT statement that returns these columns: InstructorDept The DepartmentName column from the Departments table for a related instructor LastName The LastName column from the Instructors table FirstName The FirstName column from the Instructors table CourseDescription The CourseDescription column from the Courses table CourseDept The DepartmentName column from the Departments table for a related instructor Return one row for each course that’s in a different department than the department of the instructor assigned to teach that course. (Hint: You will need to join the Departments table to both the Instructors table and the Courses table, which will require you to use table aliases to distinguish the two tables.)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.
- SQL Database Write PL/SQL or T-SQL procedures to accomplish the following tasks: Obtain the first name and last name, separated by a space, of the guide whose number currently is stored in I_GUIDE_NUM. Place these values in the variables I_FIRST_NAME and I_LAST_NAME. Output the contents of I_GUIDE_NUM, I_FIRST_NAME, and I_ LAST_NAME. Obtain the number of persons, customer number, and customer last name for every reservation whose ID currently is stored in I_RESERVATION_ID. Place these values in the variables I_NUM_PERSONS, I_CUSTOMER_NUM, and I_LAST_NAME, respectively. Output the contents of I_NUM_PERSONS, I_CUSTOMER_NUM, and I_LAST_NAME. Add a row to the GUIDE table. Change the last name of the guide whose number is stored in I_GUIDE_NUM to the value currently found in I_LAST_NAME. Delete the guide whose number is stored in I_GUIDE_NUMrelation: 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.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)…
- **IN SQL ** 1- Write a query clause to display the internal structure of the departments table, then write a query clause to display all its data, so that the result appears as follows: ** SEE PIC ** 2- Write a query sentence to display the names, jobs, dates of appointment and employee numbers so that the employee number appears firstPATHS 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 6Access Assignment Problem: JMS TechWizards is a local company that provides technical services to several small businesses in the area. The company currently keeps its technicians and clients’ records on papers. The manager requests you to create a database to store the technician and clients’ information. The following table contains the clients’ information. Client Number Client Name Street City State Postal Code Telephone Number Billed Paid Technician Number AM53 Ashton-Mills 216 Rivard Anderson TX 78077 512-555-4070 $315.50 $255.00 22 AR76 The Artshop 722 Fisher Liberty Corner TX 78080 254-555-0200 $535.00 $565.00 23 BE29 Bert's Supply 5752 Maumee Liberty Corner TX 78080 254-555-2024 $229.50 $0.00 23 DE76 D & E Grocery 464 Linnell Anderson TX 78077 512-555-6050 $485.70…
- SQL QUERIES Employees(EMPLOYEE_ID,FIRST_NAME,LAST_NAME,EMAIL,PHONE_NUMBER,HIRE_DATE,JOB_ID,SALARY,COMMISSION_PCT,MANAGER_ID,DEPARTMENT_ID)Department(DEPARTMENT_ID,DEPARTMENT_NAME,MANAGER_ID,LOCATION_ID)A: Write a query in SQL to display the minimum, maximum salary and DEPARTMENT_ID of all thosedepartments whose minimum salary is greater than 4000 in ascending order.SQL QUERIES Employees(EMPLOYEE_ID,FIRST_NAME,LAST_NAME,EMAIL,PHONE_NUMBER,HIRE_DATE,JOB_ID,SALARY,COMMISSION_PCT,MANAGER_ID,DEPARTMENT_ID)Department(DEPARTMENT_ID,DEPARTMENT_NAME,MANAGER_ID,LOCATION_ID)A: Write a query in SQL to display the minimum, maximum salary and DEPARTMENT_ID of all thosedepartments whose minimum salary is greater than 4000 in ascending order. B: Write a Query in SQL to display characters only from 2 to 5 of “Last_Name” from Employees table. C: Write a query in SQL to display the HIRE_DATE of every employee in following format.Format: 11-july-2019Instructor (Instructor_Id, Instructor_Name, specialization, Address, #Department_Id)Write in PL/SQL a function named NumberInstructor_department that takes the id of a department as an input parameter and returns the number of instructors who are working in that department.