Is 0 (zero) and NULL equivalent in database table? Explain with reason.
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Is 0 (zero) and NULL equivalent in
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- Write SQL queries for the designed database which will return: - All people on the same flight - All planes on the same destination - If the sum of all cargo weight on the plane is under a threshold.Let's say there are two students who want to enroll in the same class, but there's only room for one of them. What aspect of the database system prevents both students from obtaining the last open seat in the classroom?“There is an issue C exactly how the results we get back from our queries are formatted”, Explain this in terms of the Database Cursor in Android with a coding example of your own.
- Let's begin by enumerating the benefits of using tables in databases. Write down some thoughts you have about NULL.Consider the following scenario: there is only room for one student in the class that two students are trying to enroll in. What aspect of the database system makes it impossible for both students to claim the last open seat?choose weights from any database you want. Now because weight is a quantitative variable, turn it into a qualitative variable and construct its FDT
- How about a rundown of the advantages that come with using tables in database systems? Could you perhaps write a few words on the topic of NULL?Give two examples of how null values could be inserted into a database.consider the database below and answer the query. pk refers to primary key and FK refers to foreign key. Employee(Employee_id(PK), First_name, Last_name, Email, Phone_number, Hire_Date, Job_ID(FK) COmmision_pct, manager_id, department_id(FK)) Departments(Department_id(PK), dept_name, manager_id(FK), location_id) Locations(Location_id(PK), street_address, postal_code, city, state_province, country_id) Jobs(Job_id(PK), job_title, min_salary, max_salary) write a pl/sql script (using cursor and %TYPE) query to show the ames of all the departments which are not located in US or Canada
- consider the database below and answer the query. pk refers to primary key and FK refers to foreign key. Employee(Employee_id(PK), First_name, Last_name, Email, Phone_number, Hire_Date, Job_ID(FK) COmmision_pct, manager_id, department_id(FK)) Departments(Department_id(PK), dept_name, manager_id(FK), location_id) Locations(Location_id(PK), street_address, postal_code, city, state_province, country_id) Jobs(Job_id(PK), job_title, min_salary, max_salary) write a pl/aql script to create a procedure the string accordingly, if the employee is receiving any commision(COMMISSION_PCT) or not. the argument of the profedure is Empl_id. also, write the procedure callconsider the database below and answer the query. pk refers to primary key and FK refers to foreign key. Employee(Employee_id(PK), First_name, Last_name, Email, Phone_number, Hire_Date, Job_ID(FK) COmmision_pct, manager_id, department_id(FK)) Departments(Department_id(PK), dept_name, manager_id(FK), location_id) Locations(Location_id(PK), street_address, postal_code, city, state_province, country_id) Jobs(Job_id(PK), job_title, min_salary, max_salary) write a pl/sql script to create a trigger that prints"the department name is changed from IT to sales" whenever the department is changed from IT to salesconsider the database below and answer the query. pk refers to primary key and FK refers to foreign key. Employee(Employee_id(PK), First_name, Last_name, Email, Phone_number, Hire_Date, Job_ID(FK) COmmision_pct, manager_id, department_id(FK)) Departments(Department_id(PK), dept_name, manager_id(FK), location_id) Locations(Location_id(PK), street_address, postal_code, city, state_province, country_id) Jobs(Job_id(PK), job_title, min_salary, max_salary) wirte a function (with one argument : department name) that calculates and returns the total number of employees who are not working in IT department and earning more than $5000. write an appropriate call also. COMP 214 pl/sql