True or False below: Given two relations named A and B, if we q-JOIN A and B, the maximum number of attributes in the result relation could be (the number of attributes of A) times(*) the number of attributes of B).  * in an SQL SELECT statement means “all the tuples”.   In relational algebra, Cartesian Product (X) can be implemented using the q-JOIN operator.  Cartesian Product ISA q-JOIN where q-condition always evaluates to true. SQL is based on Predicate Calculus. A query in SQL always specifies what should be included in the query result.

Write relation algebra queries for following:Student( Enrno, name, courseId, emailId, cellno)Course(courseId, course_nm, duration)i) Add a column city in student table.ii) Find out list of students who have enrolled in “computer” course.iii) List name of all courses with their duration.iv) List name of all students start with “a”.v) List email Id and cell no of all mechanical engineering students.

Write and execute a SQL query to list all patient numbers and encounter ids which do not have any data (missing rows) in VisitSummary table. Order the result by patient number, encounter id.      Write and execute a SQL query to list all patients whose information about race or gender has changed during their future visits. A future visit is defined as T1.encounter_id < T2.encounter_id.  Your output should have patient number, old and new race values, old and new gender values, and the encounter ids.   Write and execute a SQL query to list all the patient data for all encounters. Even if patient data is missing in other tables, you still need to list the patient_nbr and encounter_id in your output. Your output should list all the columns (without repeating them) starting with encounter_id, patient_nbr... and it should be ordered by patient_nbr and then encounter_id.    Write and execute a SQL query to list all the patient data for all encounters. If the patient data is missing…