An index may speed up queries, but it's usually a terrible idea to create an index for every property or combination of properties that might be used as search keys. I'd want to know more about this.
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An index may speed up queries, but it's usually a terrible idea to create an index for every property or combination of properties that might be used as search keys. I'd want to know more about this.
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- Alternate keys: Identify at least five keys (not already listed as PK or FK) needed by end users. These indexes would be considered Alternate or Secondary keys and are mostly used for queries and quick reporting. They may contain multiple columns.An index may help speed up searches, but creating an index for every property or combination of attributes that might be used as search keys is typically a bad idea. I'd want to learn more about this.Alternate keys: Identify at least five keys (not already listed as PK or FK) needed by end users. These indexes would be considered Alternate or Secondary keys and are mostly used for queries and quick reporting. They may contain multiple columns. Books Authors Bookstore Members Sales transaction table Inventory table
- The database has three tables for tracking horse-riding lessons: Horse with columns: ID - primary key RegisteredName Breed Height BirthDate Student with columns: ID - primary key FirstName LastName Street City State Zip Phone EmailAddress LessonSchedule with columns: HorseID - partial primary key, foreign key references Horse(ID) StudentID - foreign key references Student(ID) LessonDateTime - partial primary key Write a SELECT statement to create a lesson schedule with the lesson date/time, horse ID, and the student's first and last names. Order the results in ascending order by lesson date/time, then by horse ID. Unassigned lesson times (student ID is NULL) should not appear in the schedule.The database has three tables for tracking horse-riding lessons: Horse with columns: ID - primary key RegisteredName Breed Height BirthDate Student with columns: ID - primary key FirstName LastName Street City State Zip Phone EmailAddress LessonSchedule with columns: HorseID - partial primary key, foreign key references Horse(ID) StudentID - foreign key references Student(ID) LessonDateTime - partial primary key Write a SELECT statement to create a lesson schedule with the lesson date/time, horse ID, and the student's first and last names. Order the results in ascending order by lesson date/time, then by horse ID. Unassigned lesson times (student ID is NULL) should not appear in the schedule. Hint: Perform a join on the Student and LessonSchedule tables, matching the student IDsUse Mysql code The database has three tables for tracking horse-riding lessons: Horse with columns: ID - primary key RegisteredName Breed Height BirthDate Student with columns: ID - primary key FirstName LastName Street City State Zip Phone EmailAddress LessonSchedule with columns: HorseID - partial primary key, foreign key references Horse(ID) StudentID - foreign key references Student(ID) LessonDateTime - partial primary key Write a SELECT statement to create a lesson schedule for Feb 1, 2020 with the lesson date/time, student's first and last names, and the horse's registered name. Order the results in ascending order by lesson date/time, then by the horse's registered name. Make sure unassigned lesson times (student ID is NULL) appear in the results. Hint: Perform a join on the LessonSchedule, Student, and Horse tables, matching the student IDs and horse IDs.
- Write Mysql code The database has three tables for tracking horse-riding lessons: Horse with columns: ID - primary key RegisteredName Breed Height BirthDate Student with columns: ID - primary key FirstName LastName Street City State Zip Phone EmailAddress LessonSchedule with columns: HorseID - partial primary key, foreign key references Horse(ID) StudentID - foreign key references Student(ID) LessonDateTime - partial primary key Write a SELECT statement to create a lesson schedule with the lesson date/time, horse ID, and the student's first and last names. Order the results in ascending order by lesson date/time, then by horse ID. Unassigned lesson times (student ID is NULL) should not appear in the schedule. Hint: Perform a join on the Student and LessonSchedule tables, matching the student IDs.Salesforce Assignment: Write a Salesforce Object Query Language for finding the account Record in ascending order.When working with a relational database, a select operation may be used to reduce the amount of space used by a table by removing columns that meet certain requirements.Is this the right answer or the wrong answer?
- A key for this database is {Departure Time}. Enter a different key for the database. Airline Flight Number Gate Destination Departure Time FlyRight 221 34 Denver 08:27 JetGreen 222 13 Anchorage 08:43 JetGreen 199 22 Honolulu 08:46 JetGreen 322 34 Anchorage 09:36 FlyRight 122 33 Honolulu 09:45 FlyRight 323 22 Detroit 09:50 FlyRight 222 33 Denver 09:55 Key: { Ex: GatePATHS 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 6Below is part of a student database for your reference. The primary keys are highlighted in bold. Student (studNo, studlvame, address, mobileNo) Registration (studNo, courseNo, regDate, semester, session) Course (courseNo, courseName, creditHour, level) Project (projNo, projName, courseNo) Assignment (projNo, studNo, startDate, dueDate, hoursSpent) Fill the empty lines (Line 10, 12, 22, 23, 27) with the appropriate PL/SQL code so as to complete the following anonymous block. The anonymous block displays the list of courses taken by a certain student. Allow the user to enter the STUDENT NAME: 1. ACCEPT studname PROMPT 'Enter the student name:' 2. 3. DECLARE 4. v_cid course.courseno%TYPE; 5. V_sname student.studname%TYPE:= '&studname; 6. V_cname course.coursename%TYPE; 7. 8. CURSOR course_list IS 9. SELECT c.courseno, c.coursename 10. 11. WHERE s.studno = r.studno 12. 13. AND studname = V_sname; 14. 15. BEGIN 16. 17. OPEN course_list; 18. 19. DBMS_OUTPUT.PUT_LINE(List of courses for…
