Task: In this task you are expected to fix an SQL query based on feedback. You will be given an SQL statement and an English description with what is wrong about that SQL statement. You must correct the SQL statement based off of the feedback. An SQL query works by selecting data from a table where certain conditions apply. A table contains columns where every row in that table must have a value for each column. Every table has a primary key that uniquely identifies each row, usually an id. To choose which columns are returned you specify that after the "SELECT" statement. Next, you use a "FROM" statement to specify what tables you want to select the data from. When you specify a table you can rename it with the "AS" statement. You can reference that table by whatever name follows the "AS" statement. If you want to select data from multiple tables you need to use the "JOIN" statement. This will join the tables together by pairing a row in one table with every row in the other table (Cartesian Product). To limit the number of rows returned you should use the "ON" statement. This will only return rows where the condition specified after the statement is true, this is usually an equals operator with primary keys. You can also use the "WHERE" statement to specify that only rows with column values statisfying a certain condition, should be returned. The "GROUP BY" statement will group rows together that have equal column values for whatever columns follows the statement. The "HAVING" statement will return groups that statisfy whatever condition follows the statement. Any column(s) being returned from grouped rows must either be an aggregate function, (AVG, MAX, COUNT, SUM, ...) of a column, or the column(s) that the data was grouped by. To sort the returned data you can use the "ORDER BY" command which will order the data by whatever aggregate function or column follows the statement. The "DESC" statement will sort in descending order and the "ASC" statement will sort in ascending order. Finally, you can use the "LIMIT" statement to return a certain number of rows. When "*" is used in an SQL statement every column is returned. For example, SELECT * FROM table WHERE attribute = 1, will select every column from rows with the attribute column equal to 1. 
Categories: Text to Code
Domains: SQL

Positive examples:
input: SQL: SELECT avg ( Area ) , max ( Capacity ) FROM stadium
Feedback: Swap the average of "Area" with the average of "Capacity"
output: SELECT avg(capacity) ,  max(capacity) FROM stadium
explanation: The SQL statement was adjusted to find the average of the capacity. This is a good example.; input: SQL: SELECT Count ( * ) FROM Allergy_Type AS T1 JOIN Has_Allergy AS T2 ON T1.Allergy = T2.Allergy JOIN Student AS T3 ON T2.StuID = T3.StuID WHERE T3.Sex = "M" AND T1.AllergyType = "food"
Feedback: need to count different stuid to avoid double counting students
output: SELECT count(*) FROM Student WHERE sex  =  "M" AND StuID IN (SELECT StuID FROM Has_allergy AS T1 JOIN Allergy_Type AS T2 ON T1.Allergy  =  T2.Allergy WHERE T2.allergytype  =  "food")
explanation: This output SQL statement added another SQL statement to prevent double counting students. This is exactly what the feedback suggested. This is a good example.; input: SQL: SELECT Name FROM channel ORDER BY Rating_in_percent Asc
Feedback: Arrangement must be declining.
output: SELECT name FROM channel ORDER BY rating_in_percent DESC
explanation: The feedback asks to change the sort function to descending, and the output correctly applies the change.

Negative examples:
input: SQL: SELECT JOB_TITLE FROM jobs WHERE MAX_SALARY > 9000
Feedback: it should be min salary
output: SELECT JOB_TITLE FROM jobs WHERE MAX_SALARY > 9000
explanation: This output SQL query did not change from the input. You must change the SQL input based on the feedback given.; input: SQL: SELECT SALARY , MANAGER_ID FROM employees
Feedback: assert each employee has a manger
output: SELECT salary ,  manager_id FROM employees WHERE manager_id is NULL
explanation: The output SQL query asserts that the "manager_id" is equal to null. It should assert that the "manager_id" is not equal to null.