Give two reasons why a database could include null values.
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Q: Give two reasons why a database could include null values.
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- Write SQL update statements to do the following on the database schema shown in Figure 1.i. Insert a new course, <‘Knowledge Engineering’, ‘CS4390’, 3, ‘CS’>.ii. Delete the record for the student whose name is ‘Smith’ and whose student number is 17.In a relational database, a select operation is used to minimize the size of a table by eliminating columns that fulfill certain criteria. Is this correct or incorrect?. Let's say that this restaurant only takes customers if they made a reservation, and each reservation is used to represent a party of people. Add a table to the database containing each individual food item that was ordered by a party of people. Hint: you will want to use two columns as the primary key for this table. This table should represent each food item that was ordered by a party of people. You may create a third column in this table called 'quantity', so we know how much of a food item a party of people ordered. *Enter 3-4 test records of data for each table. . Design the database tables for the scenario described above. Think of some possible attributes for each table. . Write "PK" above each column that is a Primary Key and "FK" above each column that is a Foreign Key. ●
- How does the SQL ORDER BY clause work, and why might it be important when using database functions like MAX() or MIN()? Provide a query illustrating its usage.If we want to keep track of the annual salary that is calculated depending on the stored monthly salary in the database, then what is the suitable attribute type to be used for annual salary? Maximum file size: 10KB, maximum number of files: Files7. A “natural join" in a relational database takes two tables of information and combines entries from the tables that share a particular field. You can read more about this at Wikipedia. Interpret the tables below as sets of sets? For the Course Enrollment Table define A = {{A38182818, Spring2021, Math230, 01}, ..., {A56363631, Spring2021, Math454, 01}}, and for the Student Table define B = {{Al, A81723653}, {Jo, A38182818}, {Su, A56363631}}. Course Enrollment Table Student Table A38182818 | Spring2021 | Math230 | 01 A81723653 | Spring2021 | Math350 01 Al A81723653 A81723653 Fall2020 Math152 04 Jo A56363631 A38182818 Fall2020 Math332 02 Su A38182818 A56363631 | Spring2021 Math454 | 01 (a) Construct the set C = {xUy : x € A, y E B, x N y # 0}. (b) Represent the resulting set C from part (a) as a table, similar to what you see above. Make sure to write down the table for C in a reasonably sorted order. (c) Why would you want to query the database for the set {x € C : Al e x}? Be…
- SQL thank you Given the following relational database schema: Student = (SSN, Name, Major) Course = ( CourseNumber, Quarter, CourseTitle, NumberOfUnits, RoomNumber, DayTime), where DayTime is of the form MW 1:0-2:00. Enrollment = (SSN,CourseNumber, Quarter, Grade)// Grade is Letter grade or none(Null). Express the following queries using SQL statements with a minimum number of operations and tables. List the SSN and Name of every student who has completed the smallest number of courses(with letter grades). Note that It is possible this smallest number is zero. List the SSN of every student who only have B in every course they completed ,i.e. every grade is either Null or B List the SSN of every student who only have B and no NULL value in every course they enrolled in. List the SSN of every student who did not earn the grade B in any courseWhat happens if someone tries to break a database's referential integrity? What types of errors are possible?We have a relational database that contains the table ‘Staff’. The table ‘Staff’ consist of columns ‘Name’, ‘Department’ and ‘Date of Joining’. What query would you use to extract the Names and Department of all staff in the table? a. SELECT * FROM Staff b. a) SELECT Name, Department FROM Staff c. SELECT Name, Department IN Staff d. SELECT * IN Staff
- Answer the following prompts 1The InstantRide Management team founded a new team for car maintenance. The new team is responsible for the small maintenance operations for the cars in the InstantRide system. The main idea is to take actions faster and minimize the time spent for the maintenance. Therefore, the Car Maintenance team wants to store MAINTENANCE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team. 2The Car Maintenance team also wants to store the actual maintenance operations in the database. The team wants to start with a table to store CAR_ID (CHAR(5)), MAINTENANCE_TYPE_ID (CHAR(5)) and MAINTENANCE_DUE (DATE) date for the operation. Create a new table named MAINTENANCES. The PRIMARY_KEY should be the combination of the three fields. The CAR_ID and MAINTENANCE_TYPE_ID…Discuss the advantages of using array data types in a database. Provide a scenario where using an array data type would be beneficial.List two scenarios in which null values may be inserted into a database.