refer to the given SQL statement CRATE TABLE x(y INT) INSERT INTO x(y) VALUES (1),(2),(3); CREATE VIEW n AS SELECT y FROM x; SELECT y FROM n; What does the last line mean?
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refer to the given SQL statement
CRATE TABLE x(y INT)
INSERT INTO x(y) VALUES (1),(2),(3);
CREATE VIEW n AS SELECT y FROM x;
SELECT y FROM n;
What does the last line mean?
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Solved in 2 steps
- Develop a PL/SQL block that would go through all the employees from EMPLOYEES table who work in department id= 90 (there is suppose to be 3 employee who work in Department 90)- IN BEGIN END END SECTION; Execute 3 separate of SELECT statement one after the other. Each SELECT will pull first name. salary of each employee and store them in local variables.+ SELECT LOAD INTO v_firstname1, v_salarxlWHERE emrlexee.id=100 Then second WHERE emploxee.id3101+ SELECT first_name, salary INTO v_firstname2, v_salary2 Then third + SELECTSELECTI tirst.name, salary INTO v_firstname3, v_salary3 iin WHERE emploxee id=102 ..... You must now have 6 local variables. DECLARE all of them accordingly in DECLARE section and use them in BEGIN and END.+ Then add another SELECT statement in BEGIN-END to find company average salary SELECT xa(salary) INTO aKasal FROM EMPLOYEES; !!! Do not forget to create y avgsal local variable in DECLARE section.Develop a PL/SQL block that would go through all the employees from EMPLOYEES table who work in department_id= 90 (there is suppose to be 3 employee who work in Department 90) IN BEGIN END END SECTION; Execute 3 separate of SELECT statement one after the other. Each SELECT will pull first_name , salary of each employee and store them in local variables. SELECT LOAD INTO v_firstname1, v_salary1 WHERE employee_id=100 Then second SELECT first_name, salary INTO v_firstname2, v_salary2 ….. WHERE employee_id=101 Then third SELECT, SELECT first_name, salary INTO v_firstname3, v_salary3 ….. WHERE employee_id=102 You must now have 6 local variables. DECLARE all of them accordingly in DECLARE section and use them in BEGIN and END. Then add another SELECT statement in BEGIN-END to find company average salary SELECT avg(salary) INTO v_avgsal FROM EMPLOYEES; !!! Do not forget to create v_avgsal local variable in DECLARE section.detection. Exercise 1: Addresses in Bahrain are identified using three numbers separated using commas and one single blank space. The three numbers are the house number, road number, and the block number respectively. Assume that the three numbers can have I to 4 digits. An example of a valid address is: '32, 1024, 5240'. Write a PL/SQL program that extracts the three components of the address for further processing. A sample of the output is as follows: The house number is: 32 The road number is: 1024 The block number is: 5240 Exercise 2: Consider the following student table Student (S ID, S_fname, S_Iname, S_DOB, F_ID). Write a PL/SQL program that 1. Extracts the year from the student date of birth, 2. Checks whether the year is a leap year, then 3. prints the student's first name, last name and whether he was born in a leap year. A sample of the output is as follows: Mohammed Ali was born in a leap year Mohammed Ali was not born in a leap year //if the year of birth is not leap //if…
- What happens to the existing rows of a table if the DEFAULT value of a column is changed?There are three tables in this database (see image). Write MYSQL code for: (1) Create a trigger “insert_inventory” on table “Inventory”. The trigger is fired after a row is inserted in table “Inventory”. After a row is inserted in table “inventory”, the “itemid”, the insertion time, and the action is inserted in table “Inventory_history”. The action is set to ‘add an item’. The oldprice is set to null. Test your trigger by inserting a row into Inventory and displaying the contents of Inventory_history. (2) Create a trigger “change_quantity” on table “Transaction”. The trigger is fired after a row is inserted in table “Transaction”. After a row is inserted in table “Transaction”, update the “quantity” in table “Inventory”. For example, if 3 iWatch are sold, then the quantity of iWatch in table “Inventory” is decreased by 3. Test your trigger by inserting a row into Transaction and displaying the contents of the relevant row in Inventory. (3) Create a trigger “change_price” on table…This is a database system question regarding SELECT: Which of the following statements is true for SELECT statements in general? a. HAVING is executed before WHERE when running an SQL query b. SELECT is executed before FROM when running an SQL query c. Each SELECT clause must have a WHERE clause as well. d. COUNT(column_name) function returns the number of values in the column, including any NULLs e. HAVING clause specifies a condition for selecting grouped tuples from the GROUP BY clause.
- Explain what the following SQL statements do. SELECT MAX(NewColumn) FROM (SELECT Patientid, COUNT(*) AS 'NewColumn' FROM PhysicianDX GROUP BY Patientid) AS CountTableFor testing use: MY SQL https://extendsclass.com/mysql-online.html please send screen shots of the out puts of Q1,2,3,4Implement the following ER model and sample data using Oracle SQL Developer and your CDM Oracle database account. You will submit a SQL script file and its entire outputs. The table name should be STUDENTS (plural). Each StudentID should be a five-digit number. LastName and FirstName must be entered. 12341, Doe, Jane 12342, [last name of your choice], [first name of your choice] 12343, [last name of your choice], [first name of your choice] Enrollment The table name should be ENROLLMENTS (plural). Quarters should be something like 2021Fall, 2022Winter, 2022Spring, 2022Summer1, 2022Summer2, 2022Summer10, and so forth. Grades in future quarters are entered as null. 2021Fall, 12341, IS411, A 2022Winter, 12342, IS421, null 2022Summer10, 12343, [course number of your choice], null Course The table name should be COURSES (plural). CourseNumbers should be strings of up to seven characters (e.g., IS411, DSC411, CSEC440). The course and instructor names should be strings of characters.…
- Oracle PL/SQL Implement a trigger to the following constraints: Meter readers can only read a maximum of 5 meters in any given calendar month. Customers who do not pay their bill within 60 days will their water supply cut off. Once a customer has had their supply cut off, the person or business responsible for the bill will not be able to create a new account at a different service address until such time as their arrears have been cleared.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)Question 7 Writes a PL/SQL function that calculates the factorial of a number passed as a parameter. The Factorial of a number n is defined as - O! = 1 n! = n*(n-1)*(n-2)*(n-3)... 1 for n>0