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PLZ help with the following:
A table R can be linked with more than one tables at the same time.
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- A social media application stored information about each registered user in the table create table user (id int primary key auto_increment, name varchar(100) not null) A user can have many "friends" and can also be a "friend" to many other users. Specify how this relationship would be implemented by coding the create table statement(s) for the tables.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 zeroWrite 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.
- Consider you are instructed to create reports that extracted data from a customer relationship management application.to be exact, the sales team wanted a list of all customers and their associated professions. Customers and professions tables look like this: CREATE TABLE customers ( -> id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, -> name VARCHAR (255) NOT NULL, -> profession_id INTEGER UNSIGNED NOT NULL ); CREATE TABLE professions ( -> id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, -> name VARCHAR (255) NOT NULL A) Analyze What is the shared attribute that is linking these two tables? B) Outilne a Query and use JOIN to retrieve each customer name and the associated profession name c) Retrieve only customers whose professions are "Technical writers,"Error Functions What type of error occurs with a VLOOKUP) function when there is no corresponding match between a source table and a lookup table? OPTIONS: No matching values #N/A Error #DIV/0Intersection table is needed when you have a relationship 1:1 M:N M:1 1:M
- Remember this while removing rows, columns, and tables:Briefly explain the difference between a nested if statement and a lookup function using a lookup table. Why is using a lookup function and table more efficient and effective? Provide an example.Aim: We will learn how to join tables and how to retrieve data from multiple tables.When data from more than one table in the database are needed, the two tables are joined together. Rows are joinedtogether using common values, most of the time these are primary and foreign keys that provide a link between thetwo tables.The syntax of a simple join condition is:SELECT table1.column1, table1.column2,..., table2.column1, table2.column2FROM table1, table2WHERE table1.column1=table2.column2**Please note that you may actually use as many tables as you need. You are not limited to use only twotables.Example:SELECT *FROM DEPARTMENTS;SELECT *FROM EMPLOYEES;Now join departments and employees tables.SELECT FIRST_NAME, DEPARTMENT_NAMEFROM EMPLOYEES, DEPARTMENTSWHERE EMPLOYEES.DEPARTMENT_ID = DEPARTMENTS.DEPARTMENT_ID;NOTE: If you omit the join condition, the result will be the Cartesian Product of the two tables. A CartesianProduct joins all rows of the first table with all rows of the second…
- 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.A Cartesian join between a table with 5 records and a table with 10 records returns how many rows?How can we check if a table has minimum redundency?A) There is no way to checkB) See if a table has any primary values duplicated somewhere elseC) Use a normal form to checkD) See if a table has a lot of null values
