The order of operands is significant in EXCEPT (MINUS) queries but is irrelevant in UNION queries?
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The order of operands is significant in EXCEPT (MINUS) queries but is irrelevant in UNION queries?
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- Inconsistencies:Although update queries can help, you still need human intervention to remove inconsistent values. T to F?USE NORTHWIND DATABASE Write a SELECT statement using the CASE function. The statement returns two columns basedon how many orders the customer has in the database. The first column is the customer name andthe second column, Membership Type, is based on which case applies to the customer:If the customer has more than 25 orders they are a Diamond Customer.If the customer has more than 15 orders they are a Gold Customer.If the customer has more than 10 orders they are a Silver Customer.If the customer has more than 5 orders they are an Iron Customer.Otherwise the customer is a Valued Customer.According to tables below, code SELECT statements to exemplify correlated nested queries.
- SQL optimizer tries to convert queries with nested subqueries into a join operation for better performance True False**In SQL** Write a SELECT statement that returns these columns: InstructorDept The DepartmentName column from the Departments table for a related instructor LastName The LastName column from the Instructors table FirstName The FirstName column from the Instructors table CourseDescription The CourseDescription column from the Courses table CourseDept The DepartmentName column from the Departments table for a related instructor Return one row for each course that’s in a different department than the department of the instructor assigned to teach that course. (Hint: You will need to join the Departments table to both the Instructors table and the Courses table, which will require you to use table aliases to distinguish the two tables.)Code three tests: 1) for a student who has courses 2) for student who does not have courses 3) a non-existing student ID. For each test, display the value of the student ID that was passed to the function and the result returned by the function. Also, run a supportive SELECT query or queries that prove the test results are correct.