Final answer:
To identify instructors who have awarded an 'A' grade, a SQL query joining instructors, courses, and grades tables with a condition on the grade field is used. The SELECT DISTINCT statement ensures unique instructor listings.
Step-by-step explanation:
To find the ID and name of each instructor who has given an 'A' grade in any course that they have taught, you would need to perform a SQL query that joins the relevant tables: one containing instructor information, one containing course information, and one containing grades. Assuming the tables are named instructors, courses, and grades respectively, and assuming a relationship between them exists, the following SQL query can be used:SELECT DISTINCT instructors.id, instructors.nameFROM instructorsJOIN courses ON instructors.id = courses.instructor_idJOIN grades ON courses.id = grades.course_id WHERE grades.grade = 'A';This query selects the distinct IDs and names of the instructors from the instructors table, joining it with the courses and grades tables to filter only those instructors who gave an 'A' grade at least once.
The use of DISTINCT ensures each instructor is listed only once, regardless of how many 'A' grades they've given.Here is an example SQL query to find the ID and name of each instructor who has given an 'A' grade in any course that they have taught:SELECT instructorID, instructorNameFROM instructorsWHERE grade = 'A'And here is an example SQL query to find the ID and name of each instructor who has NEVER given an 'A' grade in any course:SELECT instructorID, instructorNameFROM instructorsWHERE grade <> 'A'