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SQL для тестировщика
Даны следующие таблицы:

Students

| StudentID | Name | Age | Gender |
|-----------|-----------|-----|--------|
| 1 | John | 20 | Male |
| 2 | Jane | 22 | Female |
| 3 | Mark | 21 | Male |
| 4 | Sarah | 23 | Female |
| 5 | Michael | 20 | Male |

Courses

| CourseID | CourseName | Credits |
|----------|------------------|---------|
| 101 | Mathematics | 3 |
| 102 | Physics | 4 |
| 103 | Chemistry | 3 |
| 104 | English | 2 |
| 105 | History | 3 |

Enrollments
| EnrollmentID | StudentID | CourseID |
|--------------|-----------|----------|
| 1            | 1         | 101      |
| 2            | 2         | 101      |
| 3            | 3         | 102      |
| 4            | 4         | 101      |
| 5            | 1         | 103      |
| 6            | 2         | 105      |
| 7            | 3         | 104      |
| 8            | 4         | 102      |
| 9            | 5         | 101      |
| 10           | 5         | 103      |

Какой из следующих SQL запросов отберет всех студентов женского пола, записанных на курс "Mathemetics"?

A) SELECT Name FROM Students WHERE Gender = 'Female' AND StudentID IN (SELECT StudentID FROM Enrollments WHERE CourseName = 'Mathematics')

B) SELECT Name FROM Students JOIN Enrollments ON Students.StudentID = Enrollments.StudentID WHERE Gender = 'Female' AND CourseName = 'Mathematics'

C) SELECT Name FROM Students WHERE Gender = 'Female' AND StudentID = (SELECT StudentID FROM Enrollments WHERE CourseName = 'Mathematics')

D) SELECT Name FROM Students JOIN Enrollments ON Students.StudentID = Enrollments.StudentID WHERE Gender = 'Female' AND CourseID = 101
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Даны следующие таблицы:

Students

| StudentID | Name | Age | Gender |
|-----------|-----------|-----|--------|
| 1 | John | 20 | Male |
| 2 | Jane | 22 | Female |
| 3 | Mark | 21 | Male |
| 4 | Sarah | 23 | Female |
| 5 | Michael | 20 | Male |

Courses

| CourseID | CourseName | Credits |
|----------|------------------|---------|
| 101 | Mathematics | 3 |
| 102 | Physics | 4 |
| 103 | Chemistry | 3 |
| 104 | English | 2 |
| 105 | History | 3 |

Enrollments

| EnrollmentID | StudentID | CourseID |
|--------------|-----------|----------|
| 1            | 1         | 101      |
| 2            | 2         | 101      |
| 3            | 3         | 102      |
| 4            | 4         | 101      |
| 5            | 1         | 103      |
| 6            | 2         | 105      |
| 7            | 3         | 104      |
| 8            | 4         | 102      |
| 9            | 5         | 101      |
| 10           | 5         | 103      |

Какой из следующих SQL запросов отберет всех студентов женского пола, записанных на курс "Mathemetics"?

A) SELECT Name FROM Students WHERE Gender = 'Female' AND StudentID IN (SELECT StudentID FROM Enrollments WHERE CourseName = 'Mathematics')

B) SELECT Name FROM Students JOIN Enrollments ON Students.StudentID = Enrollments.StudentID WHERE Gender = 'Female' AND CourseName = 'Mathematics'

C) SELECT Name FROM Students WHERE Gender = 'Female' AND StudentID = (SELECT StudentID FROM Enrollments WHERE CourseName = 'Mathematics')

D) SELECT Name FROM Students JOIN Enrollments ON Students.StudentID = Enrollments.StudentID WHERE Gender = 'Female' AND CourseID = 101

BY SQL для тестировщика


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Даны следующие таблицы:Students| StudentID | Name | Age | Gender ||-----------|-----------|-----|--------|| 1 | John | 20 | Male || 2 | Jane | 22 | Female || 3 | Mark | 21 | Male || 4 | Sarah | 23 | Female || 5 | Michael | 20 | Male |Courses| CourseID | CourseName | Credits ||----------|------------------|---------|| 101 | Mathematics | 3 || 102 | Physics | 4 || 103 | Chemistry | 3 || 104 | English | 2 || 105 | History | 3 |Enrollments| EnrollmentID | StudentID | CourseID ||--------------|-----------|----------|| 1 | 1 | 101 || 2 | 2 | 101 || 3 | 3 | 102 || 4 | 4 | 101 || 5 | 1 | 103 || 6 | 2 | 105 || 7 | 3 | 104 || 8 | 4 | 102 || 9 | 5 | 101 || 10 | 5 | 103 |Какой из следующих SQL запросов отберет всех студентов женского пола

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