In this chapter, we will see how to create a collection using MongoDB. The createCollection() Method MongoDB db.createCollection(name, options) is used to create collection. Syntax Basic syntax of createCollection() command is as follows −…
The reverse function is used to reverse the given sequence. This function returns the modified sequence but the original sequence is not altered. Syntax reverse($seq as item()*) Input Parameters $seq − provided sequence.…
The temporary tables could be very useful in some cases to keep temporary data. The most important thing that should be known for temporary tables is that they will be…
Ruby provides a whole set of I/O-related methods implemented in the Kernel module. All the I/O methods are derived from the class IO. The class IO provides all the basic methods, such…
In this chapter, we will see how to drop a database using the MongoDB command. The dropDatabase() Method MongoDB db.dropDatabase() command is used to drop a existing database. Syntax The basic syntax…
The remove function is used to remove an item in a given sequence from any position. This function returns the modified sequence but the original sequence is not altered. Syntax remove($seq as…
A database index is a data structure that improves the speed of operations in a table. Indexes can be created using one or more columns, providing the basis for both…
In this chapter, we will see how to create a database in MongoDB. The use Command MongoDB uses DATABASE_NAME is used to create a database. The command will create a new database…
The insert-before function is used to insert an item in a given sequence at any position. This function returns the modified sequence but the original sequence is not altered. Syntax insert-before($seq as…
Iterators are nothing but methods supported by collections. Objects that store a group of data members are called collections. In Ruby, arrays and hashes can be termed collections. Iterators return all…