SQL allows to organize the data obtained by the query. We have two clauses for organizing the data obtained from the query that are Group By and Order By clause. The point that distinguishes Group By and Order By clause is that Group By clause is used when we want to apply the aggregate function to more than one set of tuples and Order By clause is used when we want to sort the data obtained by the query. Let us discuss some differences between Group By clause and Order By clause with the … [Read more...]
Difference Between Inner Join and Outer Join in SQL
Inner Join and Outer Join both are the types of Join. Join compares and combines tuples from two relations or tables. Inner Join specifies the natural join i.e. if you write a Join clause without Inner keyword then it performs the natural join operation. The potential difference between Inner Join and Outer Join is that Inner Join returns only the matching tuples from both the table and the Outer Join returns all the tuples from both the compared tables. Let us discuss some other differences … [Read more...]
Difference Between DES (Data Encryption Standard) and AES (Advanced Encryption Standard)
DES (Data Encryption Standard) and AES (Advanced Encryption Standard) both are the symmetric block cipher. AES was introduced to overcome the drawback of DES. As DES has a smaller key size which makes it less secure to overcome this triple DES was introduced but it turns out to be slower. Hence, later AES was introduced by the National Institute of Standard and Technology. The basic difference between DES and AES is that in DES plaintext block is divided into two halves before the main … [Read more...]
Difference Between Iterator and ListIterator in Java
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 … [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 … [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 … [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...]
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