Dataset Viewer
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| database_id
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| answer
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| difficulty
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|---|---|---|---|---|---|
0 |
department_management
|
[
"head"
] |
How many heads of the departments are older than 56 ?
|
SELECT count(*) FROM head WHERE age > 56
|
easy
|
1 |
department_management
|
[
"head"
] |
List the name, born state and age of the heads of departments ordered by age.
|
SELECT name , born_state , age FROM head ORDER BY age
|
medium
|
2 |
department_management
|
[
"department"
] |
List the creation year, name and budget of each department.
|
SELECT creation , name , budget_in_billions FROM department
|
medium
|
3 |
department_management
|
[
"department"
] |
What are the maximum and minimum budget of the departments?
|
SELECT max(budget_in_billions) , min(budget_in_billions) FROM department
|
medium
|
4 |
department_management
|
[
"department"
] |
What is the average number of employees of the departments whose rank is between 10 and 15?
|
SELECT avg(num_employees) FROM department WHERE ranking BETWEEN 10 AND 15
|
easy
|
5 |
department_management
|
[
"head"
] |
What are the names of the heads who are born outside the California state?
|
SELECT name FROM head WHERE born_state != 'California'
|
easy
|
6 |
department_management
|
[
"head",
"department",
"management"
] |
What are the distinct creation years of the departments managed by a secretary born in state 'Alabama'?
|
SELECT DISTINCT T1.creation FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id JOIN head AS T3 ON T2.head_id = T3.head_id WHERE T3.born_state = 'Alabama'
|
hard
|
7 |
department_management
|
[
"head"
] |
What are the names of the states where at least 3 heads were born?
|
SELECT born_state FROM head GROUP BY born_state HAVING count(*) >= 3
|
easy
|
8 |
department_management
|
[
"department"
] |
In which year were most departments established?
|
SELECT creation FROM department GROUP BY creation ORDER BY count(*) DESC LIMIT 1
|
hard
|
9 |
department_management
|
[
"department",
"management"
] |
Show the name and number of employees for the departments managed by heads whose temporary acting value is 'Yes'?
|
SELECT T1.name , T1.num_employees FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id WHERE T2.temporary_acting = 'Yes'
|
medium
|
10 |
department_management
|
[
"management"
] |
How many acting statuses are there?
|
SELECT count(DISTINCT temporary_acting) FROM management
|
easy
|
11 |
department_management
|
[
"department",
"management"
] |
How many departments are led by heads who are not mentioned?
|
SELECT count(*) FROM department WHERE department_id NOT IN (SELECT department_id FROM management);
|
extra
|
12 |
department_management
|
[
"head",
"management"
] |
What are the distinct ages of the heads who are acting?
|
SELECT DISTINCT T1.age FROM management AS T2 JOIN head AS T1 ON T1.head_id = T2.head_id WHERE T2.temporary_acting = 'Yes'
|
medium
|
13 |
department_management
|
[
"head",
"department",
"management"
] |
List the states where both the secretary of 'Treasury' department and the secretary of 'Homeland Security' were born.
|
SELECT T3.born_state FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id JOIN head AS T3 ON T2.head_id = T3.head_id WHERE T1.name = 'Treasury' INTERSECT SELECT T3.born_state FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id JOIN head AS T3 ON T2.head_id = T3.head_id WHERE T1.name = 'Homeland Security'
|
extra
|
14 |
department_management
|
[
"department",
"management"
] |
Which department has more than 1 head at a time? List the id, name and the number of heads.
|
SELECT T1.department_id , T1.name , count(*) FROM management AS T2 JOIN department AS T1 ON T1.department_id = T2.department_id GROUP BY T1.department_id HAVING count(*) > 1
|
medium
|
15 |
department_management
|
[
"head"
] |
Which head's name has the substring 'Ha'? List the id and name.
|
SELECT head_id , name FROM head WHERE name LIKE '%Ha%'
|
medium
|
16 |
farm
|
[
"farm"
] |
How many farms are there?
|
SELECT count(*) FROM farm
|
easy
|
17 |
farm
|
[
"farm"
] |
Count the number of farms.
|
SELECT count(*) FROM farm
|
easy
|
18 |
farm
|
[
"farm"
] |
List the total number of horses on farms in ascending order.
|
SELECT Total_Horses FROM farm ORDER BY Total_Horses ASC
|
easy
|
19 |
farm
|
[
"farm"
] |
What is the total horses record for each farm, sorted ascending?
|
SELECT Total_Horses FROM farm ORDER BY Total_Horses ASC
|
easy
|
20 |
farm
|
[
"farm_competition"
] |
What are the hosts of competitions whose theme is not "Aliens"?
|
SELECT Hosts FROM farm_competition WHERE Theme != 'Aliens'
|
easy
|
21 |
farm
|
[
"farm_competition"
] |
Return the hosts of competitions for which the theme is not Aliens?
|
SELECT Hosts FROM farm_competition WHERE Theme != 'Aliens'
|
easy
|
22 |
farm
|
[
"farm_competition"
] |
What are the themes of farm competitions sorted by year in ascending order?
|
SELECT Theme FROM farm_competition ORDER BY YEAR ASC
|
easy
|
23 |
farm
|
[
"farm_competition"
] |
Return the themes of farm competitions, sorted by year ascending.
|
SELECT Theme FROM farm_competition ORDER BY YEAR ASC
|
easy
|
24 |
farm
|
[
"farm"
] |
What is the average number of working horses of farms with more than 5000 total number of horses?
|
SELECT avg(Working_Horses) FROM farm WHERE Total_Horses > 5000
|
easy
|
25 |
farm
|
[
"farm"
] |
Give the average number of working horses on farms with more than 5000 total horses.
|
SELECT avg(Working_Horses) FROM farm WHERE Total_Horses > 5000
|
easy
|
26 |
farm
|
[
"farm"
] |
What are the maximum and minimum number of cows across all farms.
|
SELECT max(Cows) , min(Cows) FROM farm
|
medium
|
27 |
farm
|
[
"farm"
] |
Return the maximum and minimum number of cows across all farms.
|
SELECT max(Cows) , min(Cows) FROM farm
|
medium
|
28 |
farm
|
[
"city"
] |
How many different statuses do cities have?
|
SELECT count(DISTINCT Status) FROM city
|
easy
|
29 |
farm
|
[
"city"
] |
Count the number of different statuses.
|
SELECT count(DISTINCT Status) FROM city
|
easy
|
30 |
farm
|
[
"city"
] |
List official names of cities in descending order of population.
|
SELECT Official_Name FROM city ORDER BY Population DESC
|
easy
|
31 |
farm
|
[
"city"
] |
What are the official names of cities, ordered descending by population?
|
SELECT Official_Name FROM city ORDER BY Population DESC
|
easy
|
32 |
farm
|
[
"city"
] |
List the official name and status of the city with the largest population.
|
SELECT Official_Name , Status FROM city ORDER BY Population DESC LIMIT 1
|
medium
|
33 |
farm
|
[
"city"
] |
What is the official name and status of the city with the most residents?
|
SELECT Official_Name , Status FROM city ORDER BY Population DESC LIMIT 1
|
medium
|
34 |
farm
|
[
"city",
"farm_competition"
] |
Show the years and the official names of the host cities of competitions.
|
SELECT T2.Year , T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID
|
medium
|
35 |
farm
|
[
"city",
"farm_competition"
] |
Give the years and official names of the cities of each competition.
|
SELECT T2.Year , T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID
|
medium
|
36 |
farm
|
[
"city",
"farm_competition"
] |
Show the official names of the cities that have hosted more than one competition.
|
SELECT T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID HAVING COUNT(*) > 1
|
medium
|
37 |
farm
|
[
"city",
"farm_competition"
] |
What are the official names of cities that have hosted more than one competition?
|
SELECT T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID HAVING COUNT(*) > 1
|
medium
|
38 |
farm
|
[
"city",
"farm_competition"
] |
Show the status of the city that has hosted the greatest number of competitions.
|
SELECT T1.Status FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID ORDER BY COUNT(*) DESC LIMIT 1
|
extra
|
39 |
farm
|
[
"city",
"farm_competition"
] |
What is the status of the city that has hosted the most competitions?
|
SELECT T1.Status FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID ORDER BY COUNT(*) DESC LIMIT 1
|
extra
|
40 |
farm
|
[
"city",
"farm_competition"
] |
Please show the themes of competitions with host cities having populations larger than 1000.
|
SELECT T2.Theme FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID WHERE T1.Population > 1000
|
medium
|
41 |
farm
|
[
"city",
"farm_competition"
] |
What are the themes of competitions that have corresponding host cities with more than 1000 residents?
|
SELECT T2.Theme FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID WHERE T1.Population > 1000
|
medium
|
42 |
farm
|
[
"city"
] |
Please show the different statuses of cities and the average population of cities with each status.
|
SELECT Status , avg(Population) FROM city GROUP BY Status
|
medium
|
43 |
farm
|
[
"city"
] |
What are the statuses and average populations of each city?
|
SELECT Status , avg(Population) FROM city GROUP BY Status
|
medium
|
44 |
farm
|
[
"city"
] |
Please show the different statuses, ordered by the number of cities that have each.
|
SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) ASC
|
medium
|
45 |
farm
|
[
"city"
] |
Return the different statuses of cities, ascending by frequency.
|
SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) ASC
|
medium
|
46 |
farm
|
[
"city"
] |
List the most common type of Status across cities.
|
SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) DESC LIMIT 1
|
hard
|
47 |
farm
|
[
"city"
] |
What is the most common status across all cities?
|
SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) DESC LIMIT 1
|
hard
|
48 |
farm
|
[
"farm_competition",
"city"
] |
List the official names of cities that have not held any competition.
|
SELECT Official_Name FROM city WHERE City_ID NOT IN (SELECT Host_city_ID FROM farm_competition)
|
hard
|
49 |
farm
|
[
"farm_competition",
"city"
] |
What are the official names of cities that have not hosted a farm competition?
|
SELECT Official_Name FROM city WHERE City_ID NOT IN (SELECT Host_city_ID FROM farm_competition)
|
hard
|
50 |
farm
|
[
"city"
] |
Show the status shared by cities with population bigger than 1500 and smaller than 500.
|
SELECT Status FROM city WHERE Population > 1500 INTERSECT SELECT Status FROM city WHERE Population < 500
|
hard
|
51 |
farm
|
[
"city"
] |
Which statuses correspond to both cities that have a population over 1500 and cities that have a population lower than 500?
|
SELECT Status FROM city WHERE Population > 1500 INTERSECT SELECT Status FROM city WHERE Population < 500
|
hard
|
52 |
farm
|
[
"city"
] |
Find the official names of cities with population bigger than 1500 or smaller than 500.
|
SELECT Official_Name FROM city WHERE Population > 1500 OR Population < 500
|
medium
|
53 |
farm
|
[
"city"
] |
What are the official names of cities that have population over 1500 or less than 500?
|
SELECT Official_Name FROM city WHERE Population > 1500 OR Population < 500
|
medium
|
54 |
farm
|
[
"city"
] |
Show the census ranking of cities whose status are not "Village".
|
SELECT Census_Ranking FROM city WHERE Status != "Village"
|
easy
|
55 |
farm
|
[
"city"
] |
What are the census rankings of cities that do not have the status "Village"?
|
SELECT Census_Ranking FROM city WHERE Status != "Village"
|
easy
|
56 |
student_assessment
|
[
"student_course_registrations",
"courses"
] |
which course has most number of registered students?
|
SELECT T1.course_name FROM courses AS T1 JOIN student_course_registrations AS T2 ON T1.course_id = T2.course_Id GROUP BY T1.course_id ORDER BY count(*) DESC LIMIT 1
|
extra
|
57 |
student_assessment
|
[
"student_course_registrations",
"courses"
] |
What is the name of the course with the most registered students?
|
SELECT T1.course_name FROM courses AS T1 JOIN student_course_registrations AS T2 ON T1.course_id = T2.course_Id GROUP BY T1.course_id ORDER BY count(*) DESC LIMIT 1
|
extra
|
58 |
student_assessment
|
[
"student_course_registrations"
] |
what is id of students who registered some courses but the least number of courses in these students?
|
SELECT student_id FROM student_course_registrations GROUP BY student_id ORDER BY count(*) LIMIT 1
|
hard
|
59 |
student_assessment
|
[
"student_course_registrations"
] |
What are the ids of the students who registered for some courses but had the least number of courses for all students?
|
SELECT student_id FROM student_course_registrations GROUP BY student_id ORDER BY count(*) LIMIT 1
|
hard
|
60 |
student_assessment
|
[
"candidates",
"people"
] |
what are the first name and last name of all candidates?
|
SELECT T2.first_name , T2.last_name FROM candidates AS T1 JOIN people AS T2 ON T1.candidate_id = T2.person_id
|
medium
|
61 |
student_assessment
|
[
"candidates",
"people"
] |
What are the first and last names of all the candidates?
|
SELECT T2.first_name , T2.last_name FROM candidates AS T1 JOIN people AS T2 ON T1.candidate_id = T2.person_id
|
medium
|
62 |
student_assessment
|
[
"student_course_attendance",
"students"
] |
List the id of students who never attends courses?
|
SELECT student_id FROM students WHERE student_id NOT IN (SELECT student_id FROM student_course_attendance)
|
hard
|
63 |
student_assessment
|
[
"student_course_attendance",
"students"
] |
What are the ids of every student who has never attended a course?
|
SELECT student_id FROM students WHERE student_id NOT IN (SELECT student_id FROM student_course_attendance)
|
hard
|
64 |
student_assessment
|
[
"student_course_attendance"
] |
List the id of students who attended some courses?
|
SELECT student_id FROM student_course_attendance
|
easy
|
65 |
student_assessment
|
[
"student_course_attendance"
] |
What are the ids of all students who have attended at least one course?
|
SELECT student_id FROM student_course_attendance
|
easy
|
66 |
student_assessment
|
[
"student_course_registrations",
"courses"
] |
What are the ids of all students for courses and what are the names of those courses?
|
SELECT T1.student_id , T2.course_name FROM student_course_registrations AS T1 JOIN courses AS T2 ON T1.course_id = T2.course_id
|
medium
|
67 |
student_assessment
|
[
"student_course_registrations",
"students"
] |
What is detail of the student who most recently registered course?
|
SELECT T2.student_details FROM student_course_registrations AS T1 JOIN students AS T2 ON T1.student_id = T2.student_id ORDER BY T1.registration_date DESC LIMIT 1
|
hard
|
68 |
student_assessment
|
[
"student_course_registrations",
"students"
] |
What details do we have on the students who registered for courses most recently?
|
SELECT T2.student_details FROM student_course_registrations AS T1 JOIN students AS T2 ON T1.student_id = T2.student_id ORDER BY T1.registration_date DESC LIMIT 1
|
hard
|
69 |
student_assessment
|
[
"student_course_attendance",
"courses"
] |
How many students attend course English?
|
SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T1.course_name = "English"
|
medium
|
70 |
student_assessment
|
[
"student_course_attendance",
"courses"
] |
How many students are attending English courses?
|
SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T1.course_name = "English"
|
medium
|
71 |
student_assessment
|
[
"student_course_attendance",
"courses"
] |
How many courses do the student whose id is 171 attend?
|
SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T2.student_id = 171
|
medium
|
72 |
student_assessment
|
[
"student_course_attendance",
"courses"
] |
How many courses does the student with id 171 actually attend?
|
SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T2.student_id = 171
|
medium
|
73 |
student_assessment
|
[
"candidates",
"people"
] |
Find id of the candidate whose email is [email protected]?
|
SELECT T2.candidate_id FROM people AS T1 JOIN candidates AS T2 ON T1.person_id = T2.candidate_id WHERE T1.email_address = "[email protected]"
|
medium
|
74 |
student_assessment
|
[
"candidates",
"people"
] |
What is the id of the candidate whose email is [email protected]?
|
SELECT T2.candidate_id FROM people AS T1 JOIN candidates AS T2 ON T1.person_id = T2.candidate_id WHERE T1.email_address = "[email protected]"
|
medium
|
75 |
student_assessment
|
[
"candidate_assessments"
] |
Find id of the candidate who most recently accessed the course?
|
SELECT candidate_id FROM candidate_assessments ORDER BY assessment_date DESC LIMIT 1
|
medium
|
76 |
student_assessment
|
[
"candidate_assessments"
] |
What is the id of the candidate who most recently accessed the course?
|
SELECT candidate_id FROM candidate_assessments ORDER BY assessment_date DESC LIMIT 1
|
medium
|
77 |
student_assessment
|
[
"student_course_registrations",
"students"
] |
What is detail of the student who registered the most number of courses?
|
SELECT T1.student_details FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id ORDER BY count(*) DESC LIMIT 1
|
extra
|
78 |
student_assessment
|
[
"student_course_registrations",
"students"
] |
What are the details of the student who registered for the most number of courses?
|
SELECT T1.student_details FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id ORDER BY count(*) DESC LIMIT 1
|
extra
|
79 |
student_assessment
|
[
"student_course_registrations",
"students"
] |
List the id of students who registered some courses and the number of their registered courses?
|
SELECT T1.student_id , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id
|
medium
|
80 |
student_assessment
|
[
"student_course_registrations",
"students"
] |
For every student who is registered for some course, how many courses are they registered for?
|
SELECT T1.student_id , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id
|
medium
|
81 |
student_assessment
|
[
"student_course_registrations",
"courses",
"students"
] |
How many registed students do each course have? List course name and the number of their registered students?
|
SELECT T3.course_name , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id JOIN courses AS T3 ON T2.course_id = T3.course_id GROUP BY T2.course_id
|
hard
|
82 |
student_assessment
|
[
"student_course_registrations",
"courses",
"students"
] |
For each course id, how many students are registered and what are the course names?
|
SELECT T3.course_name , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id JOIN courses AS T3 ON T2.course_id = T3.course_id GROUP BY T2.course_id
|
hard
|
83 |
student_assessment
|
[
"candidate_assessments"
] |
Find id of candidates whose assessment code is "Pass"?
|
SELECT candidate_id FROM candidate_assessments WHERE asessment_outcome_code = "Pass"
|
easy
|
84 |
student_assessment
|
[
"candidate_assessments"
] |
What are the ids of the candidates that have an outcome code of Pass?
|
SELECT candidate_id FROM candidate_assessments WHERE asessment_outcome_code = "Pass"
|
easy
|
85 |
student_assessment
|
[
"candidate_assessments",
"candidates",
"people"
] |
Find the cell mobile number of the candidates whose assessment code is "Fail"?
|
SELECT T3.cell_mobile_number FROM candidates AS T1 JOIN candidate_assessments AS T2 ON T1.candidate_id = T2.candidate_id JOIN people AS T3 ON T1.candidate_id = T3.person_id WHERE T2.asessment_outcome_code = "Fail"
|
hard
|
86 |
student_assessment
|
[
"candidate_assessments",
"candidates",
"people"
] |
What are the cell phone numbers of the candidates that received an assessment code of "Fail"?
|
SELECT T3.cell_mobile_number FROM candidates AS T1 JOIN candidate_assessments AS T2 ON T1.candidate_id = T2.candidate_id JOIN people AS T3 ON T1.candidate_id = T3.person_id WHERE T2.asessment_outcome_code = "Fail"
|
hard
|
87 |
student_assessment
|
[
"student_course_attendance"
] |
What are the id of students who registered course 301?
|
SELECT student_id FROM student_course_attendance WHERE course_id = 301
|
easy
|
88 |
student_assessment
|
[
"student_course_attendance"
] |
What are the ids of the students who registered for course 301?
|
SELECT student_id FROM student_course_attendance WHERE course_id = 301
|
easy
|
89 |
student_assessment
|
[
"student_course_attendance"
] |
What is the id of the student who most recently registered course 301?
|
SELECT student_id FROM student_course_attendance WHERE course_id = 301 ORDER BY date_of_attendance DESC LIMIT 1
|
hard
|
90 |
student_assessment
|
[
"student_course_attendance"
] |
What are the ids of the students who registered for course 301 most recently?
|
SELECT student_id FROM student_course_attendance WHERE course_id = 301 ORDER BY date_of_attendance DESC LIMIT 1
|
hard
|
91 |
student_assessment
|
[
"addresses",
"people_addresses"
] |
Find distinct cities of addresses of people?
|
SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id
|
easy
|
92 |
student_assessment
|
[
"addresses",
"people_addresses"
] |
What are the different cities where people live?
|
SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id
|
easy
|
93 |
student_assessment
|
[
"addresses",
"people_addresses",
"students"
] |
Find distinct cities of address of students?
|
SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id JOIN students AS T3 ON T2.person_id = T3.student_id
|
medium
|
94 |
student_assessment
|
[
"addresses",
"people_addresses",
"students"
] |
What are the different cities where students live?
|
SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id JOIN students AS T3 ON T2.person_id = T3.student_id
|
medium
|
95 |
student_assessment
|
[
"courses"
] |
List the names of courses in alphabetical order?
|
SELECT course_name FROM courses ORDER BY course_name
|
easy
|
96 |
student_assessment
|
[
"courses"
] |
What are the names of the courses in alphabetical order?
|
SELECT course_name FROM courses ORDER BY course_name
|
easy
|
97 |
student_assessment
|
[
"people"
] |
List the first names of people in alphabetical order?
|
SELECT first_name FROM people ORDER BY first_name
|
easy
|
98 |
student_assessment
|
[
"people"
] |
What are the first names of the people in alphabetical order?
|
SELECT first_name FROM people ORDER BY first_name
|
easy
|
99 |
student_assessment
|
[
"student_course_registrations",
"student_course_attendance"
] |
What are the id of students who registered courses or attended courses?
|
SELECT student_id FROM student_course_registrations UNION SELECT student_id FROM student_course_attendance
|
hard
|
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