MongoDB Delete

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Deleting a Document

At some stage you may want to delete a document from a collection. The format is:

db.collectionName.deleteOne(query_criteria) /* deletes the first document found that matches the query criteria */

db.collectionName.remove(query_criteria) /* deletes all documents found that matches the query criteria */

db.collectionName.remove(query_criteria) /* deletes all documents in a collection (use with care!) */

Deleting a Collection

If you want to drop a collection completely, including any data held in it:

db.collectionName.drop() /* removes a collection completely (use with care!) */

This is equivalent to the SQL command:

DROP TABLE tableName;

Delete Department 40

Department 40 has closed down:

db.dept.deleteOne({deptno:40})

Note, if the query_criteria only returns one document, remove() and deleteOne() will have the same effect.

This is equivalent to the SQL command:

DELETE FROM dept WHERE deptno = 40;

Check that the collection has gone:

db.dept.find({deptno:40})

Next Step

This concludes the section on manipulating collections. Return to the Workbook.