The Iterator and ListIterator are the two among the three cursors of Java. Both Iterator and ListIterator are defined by Collection Framework in Java.Util package. ListIterator is the child interface of Iterator interface. The major difference between Iterator and ListIterator is that Iterator can traverse the elements in the collection only in forward direction whereas, the ListIterator can traverse the elements in a collection in both the forward as well as the backwards direction. Let us … [Read more...]
Difference Between ArrayList and LinkedList in Java
ArrayList and LinkedList are the Collection classes, and both of them implements the List interface. The ArrayList class creates the list which is internally stored in a dynamic array that grows or shrinks in size as the elements are added or deleted from it. LinkedList also creates the list which is internally stored in a Doubly Linked List. Both the classes are used to store the elements in the list, but the major difference between both the classes ArrayList and LinkedList is that ArrayList … [Read more...]
Difference Between HashMap and TreeMap in Java
HashMap and TreeMap are the Map classes and both implements the Map interface. Map is an object that stores key-value pairs, where each key is unique and but there may be duplicate values. The HashMap class uses the hash table as a data structure. The TreeMap uses the red-black tree as a data structure. The main difference between HashMap and Treemap is that the HashMap does not preserve the insertion order whereas, the Treemap does. So let us begin our discussion on the differences between … [Read more...]
Difference Between JOIN and UNION in SQL
JOIN and UNION are the clauses in SQL, used to combine the data of two or more relations. But the way in which they combine data and format of the result obtained, differs. The JOIN clause combines the attributes of two relations to form the resultant tuples whereas, UNION clause combines the result of two queries. Let us discuss the difference between JOIN and UNION with the help of comparison chart shown below. Content: JOIN Vs UNION Comparison Chart Definition Key Differences … [Read more...]
Difference Between SQL and PL/SQL
SQL and PL/SQL are relational database languages. SQL is a structured query language that adds, deletes, modifies or manipulates the data in the database. PL/SQL is a Procedural language which is an extension of SQL, and it holds the SQL statements within its syntax. The basic difference between SQL and PL/SQL is that in SQL a single query gets executed at a time whereas, in PL/SQL a whole block of code get executed at a time. Let us discuss some more differences between SQL and PL/SQL with … [Read more...]
Difference Between Oracle and SQL Server
Among many Relational Database Management System (RDBMS), the two most popular and widely used are Oracle and SQL Server. There are many fundamental differences between Oracle and SQL Server one of the most important differences between them is the language they use. Oracle uses PL/SQL (Procedure Language SQL), and SQL Server uses T-SQL i.e. Transact-SQL. Let us discuss some more differences between Oracle and SQL Server with the help of the comparison chart shown below. Content: Oracle Vs … [Read more...]
Difference Between ALTER and UPDATE Command in SQL
ALTER and UPDATE are the two modifying commands of SQL. ALTER is used to modify the structure of the relations (Tables) in the database. UPDATE Command is used to modify the data stored in a relation of the database. The basic difference between ALTER and UPDATE Command is that ALTER command is a Data Definition Language command whereas the UPDATE command is a Data Manipulation Language command. Let us discuss the differences between ALTER and UPDATE Command with the help of the comparison … [Read more...]
Difference Between Trigger and Procedure
Trigger and Procedure are Component of Advanced SQL. Trigger and Procedure both perform a specified task on their execution. The fundamental difference between Trigger and Procedure is that the Trigger executes automatically on occurrences of an event whereas, the Procedure is executed when it is explicitly invoked. Let us discuss some more differences between Trigger and Procedure with the help of a comparison chart shown below. Content: Trigger Vs Procedure Comparison Chart … [Read more...]
Difference Between E-R Model and Relational Model in DBMS
E-R Model and Relational Model both are the types of Data Model. Data Model describes a way to design database at physical, logical and view level. The main difference between E-R Model and Relational Model is that E-R Model is entity specific, and Relational Model is table specific. Let us discuss some differences between E-R Model and Relation model with the help of comparison chart shown below. Content: E-R Model Vs Relational Model Comparison Chart Definition Key Differences … [Read more...]
Difference Between GSM and CDMA
In this article, we are going to discuss the two popular technologies that provide multiple accessibilities to a channel GSM and CDMA. The basic difference between GSM and CDMA is that GSM is specific to a SIM card that is used with the mobile phone. On the other hands, the CDMA is handset specific. Let us discuss some more differences between GSM and CDMA in the comparison chart shown below. Content: GSM Vs CDMA Comparison Chart Definition Key Differences … [Read more...]
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