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- Using the WideWorldDistributors database and the Sales schema create a function that takes InvoiceID as an input parameter and returns all the rows from the table InvoiceLines for the InvoiceID value passed into the function. If the result is a NULL return a zeroTo start, what is the Dataset object?oracle PL/SQL Create an anonymous block that prints all instructors First Name, Last name, and a phone. Hint: Use cursor and coursor FOR loop. desc instructor----------------------------------------- -------- ----------------------------INSTRUCTOR_ID NOT NULL NUMBER(8)SALUTATION VARCHAR2(5)FIRST_NAME VARCHAR2(25)LAST_NAME VARCHAR2(25)STREET_ADDRESS VARCHAR2(50)ZIP VARCHAR2(5)PHONE VARCHAR2(15)
- What precisely is metadata? An answer to this question may be found in the result set's metadata. Result set information may be beneficial in a variety of situations.What happens if you try to decrease the scale or precision of a NUMBER column to a value less than the data already stored in the field?Composite datatypes can only have multi row &multi column values in them Answers: Yes No
- Write Mysql code for: 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.Describe the technique for views to save reprogramming time.use https://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=MCRFPUS2&f=M to prepare data for time-series analysis Data needs to be melted All missing data must be removed Year should be converted to ‘string’ data type such that the Year is 4-digit string ‘Month’ and ‘Year’ should be combined and converted to Pandas datetime data type and promoted as index Unnecessary columns should be removed
- Views in SQL are kind of virtual tables. A view also has rows and columns as they are in a real table in the database. We can create a view by selecting fields from one or more tables present in the database. A View can either have all the rows of a table or specific rows based on certain conditions. Under what circumstances would you create a View?pz help in sql View can be used to retrieve data from several tables and to provide data security Select one: a. True b. FalseCan you explain the Dataset object in detail?