Jan 08, 2017 · Find the Id of students who take every course. Assuming course table contains all the courses a student can take, you can group by the id column in the results table and check if the count is equal to the row count in course table. SELECT ID FROM RESULTS GROUP BY ID HAVING COUNT(DISTINCT CRSCODE) = (SELECT COUNT(*) FROM COURSE)
select * from tablename where (course_id = 101) and (student_Id not in (select Student_ID from tablename where course_id =102)); to check if someone is in both: select * from tablename where (course_id = 101) and (student_Id in (select student_Id from tablename where course_id =102));
Oct 19, 2014 · write sql query for that. find the list of student id who enrolled in one course english or Sindhi but not enrolled in both courses. table name : course. having two columns. courseid|cname. table name : studentcourse. having two …
In the examples below, we will be exploring both these scenarios using a simple customer order database. In terms of the general approach for either scenario, finding duplicates values in SQL comprises two key steps: Using the GROUP BY clause to group all rows by the target column (s) – i.e. the column (s) you want to check for duplicate values on. Using the COUNT function in the …
First, you will need to define the criteria for detecting duplicate rows. Is it a combination of two or more columns where you want to detect duplicate values, or are you simply searching for duplicates within a single column?
Here, we will be demonstrating how you can find duplicate values in a single column. For this example, we will be using the Orders table, a modified version of the table we used in my previous article on using GROUP BY in SQL. A sample of the table is shown below.
Often, you’re interested in finding rows where a combination of a few columns match. For this example, we will be using the OrderDetails table, a sample of which is shown below.