How to find more than 1 record

Question

Hi In a table i want to check if Student Id exists for more than 1 record. Thanks

Jignesh Kumar · Answer

Hello Ramco, You can use having caluse with count() > 1 ; SELECT Id, COUNT(*) FROM YourTableName GROUP BY Id HAVING COUNT(*) > 1

Amit Mohanty · Answer

You can use a SQL query with the GROUP BY clause and the HAVING clause to check if a Student ID exists for more than one record in a table. Here's an example: SELECT StudentID, COUNT(*) as NumRecords FROM YourTable GROUP BY StudentID HAVING COUNT(*) > 1;

Tuhin Paul · Answer

You can use aggregation pipelines to check if a student ID exists for more than one record. Depending on the specific NoSQL database you're using, the syntax and exact approach may vary. db.students.aggregate([ { $group: { _id: "$student_id", count: { $sum: 1 } } }, { $match: { count: { $gt: 1 } } } ]) This pipeline groups documents by the "student_id" field, calculates a count for each group, and filters out groups with a count of 1. The resulting output will include the IDs of any students that have more than one record.

Jay Krishna Reddy · Answer

SELECT StudentId, COUNT(*) as Count FROM Students GROUP BY StudentId HAVING COUNT(*) > 1 This query will group the records in the "Students" table by the "StudentId" column, count the number of records for each group, and then return only the groups where the count is greater than 1.

Vishal Joshi · Answer

Hello You can simply get a count of records that exists for the same id like the below query and in code, you can check if the count is greater than 1. SELECT COUNT(1) as TotalCount FROM YourTable Where StudentID = YourSearchId Server side you can check like below code if (TotalCound > 1) { // Code } else { // existing behaviour } Thanks Vishal