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Database Articles
Page 124 of 547
Program for Fibonacci numbers in PL/SQL
Given ‘n’ numbers the task is to generate the Fibonacci numbers in PL/SQL starting from 0 to n, where the Fibonacci series of integers is in the form 0, 1, 1, 2, 3, 5, 8, 13, 21, 34 Where integers 0 (1st place) and 1 (2nd place) will have a fixed place after that, the previous two digits will be added to get the integer of the next place as shown below. 0+1=1 (3rd place) 1+1=2 (4th place) 2+1=3 (5th place) and So on. Formula Sequence F(n) ...
Read MoreShow MySQL host via SQL Command?
To display MySQL host via SQL command, use the system variable hostname. Query 1 The following is the query to display the host − mysql > select @@hostname; Output Here is the output − +-----------------+ | @@hostname | +-----------------+ | DESKTOP-QN2RB3H | +-----------------+ 1 row in set (0.00 sec) Query 2 Or you can use "show variables" command to show MySQL host via SQL command. show variables where Variable_name like '%host%'; Output The following is the output − +-------------------------------+-----------------+ | Variable_name | Value | +-------------------------------+-----------------+ | host_cache_size | 279 | | hostname | DESKTOP-QN2RB3H | | performance_schema_hosts_size | -1 | | report_host | | +-------------------------------+-----------------+ 4 rows in set (0.07 sec)
Read MoreDifference between hierarchical and network database model in SQL
Hierarchical Data Model In the Hierarchical data model, the relationship between the table and data is defined in parent-child structure. In this structure, data is arranged in the form of a tree structure. This model supports one-to-one and one-to-many relationships. Network Model The Network model arranges data in a graph structure. In this model, each parent can have multiple children, and children can also have multiple parents. This model supports many-to-many relationships as well. Comparison Table ...
Read MoreDifference between correlated and non-collreated subqueries in SQL
SQL query is used to fetch data from the database. In some of the scenario you may need some perquisite data to call subsequent SQL query to fetch data from a table so instead of writing two seperate query we can write SQL query within the query. Therefore subQuery is a way to combine or join them in single query. Subqurey can have two types −Correlated subquery - In correlated subquery, inner query is dependent on the outer query. Outer query needs to be executed before inner queryNon-Correlated subquery - In non-correlated query inner query does not dependent on the outer ...
Read MoreEmbedded SQL, Dynamic SQL, and SQLJ
Embedded SQL Embedded SQL is a method that combines SQL with a high−level programming language's features. It enables programmers to put SQL statements right into the source code files used to set up an application. Database operations may be carried out effortlessly by developers by adding SQL statements to the application code. The source code files having embedded SQL statements should be preprocessed before compilation because of the issue of interpretation of SQL statements by the high−level programming languages in embedded SQL. The terms EXEC SQL and END_EXEC must be used before and after each SQL statement in the source ...
Read MoreEmbedded SQL in DBMS
Embedded SQL is a powerful method that allows the integration of high−level programming languages with database management systems (DBMS). It acts as a bridge between applications and databases which helps in data manipulation and communication. Various database management systems offer embedded SQL, giving developers the freedom to select the one that best serves their requirements. Popular DBMS that support Embedded SQL are Altibase, IBM Db2, Microsoft SQL Server, Mimer SQL, Oracle Database, PostgreSQL, and SAP Sybase. Need of Embedded SQL The goal to make database interactions simpler for application developers and end users determines the demand for embedded SQL. ...
Read MoreJava – MySQL connection with ipAddress
In this article, we will learn how to connect a Java application to a MySQL database hosted on a specific IP address. By specifying the IP address in the connection URL, we can directly connect to the database even if it’s on a different machine. We’ll use the DriverManager.getConnection() method to initiate the connection. Steps to connect a MySQL database via IP Address Following are the steps to connect a MySQL database via IP Address − Import Connection and DriverManager classes from the java.sql package to enable database connectivity. Create a String ...
Read MoreDifference between Adabas and Alibaba Cloud ApsaraDB for PolarDB
Databases form the backbone of many applications, but not all databases are created equal. Adabas and Alibaba Cloud ApsaraDB for PolarDB exemplify this with their distinct characteristics and use cases. Here's a comprehensive comparison − Type and Purpose Adabas Type − High-performance, transactional NoSQL database. Purpose − Optimized for high-volume transaction processing, commonly used in industries like finance, government, telecommunications, and ERP systems for its reliability and speed. ApsaraDB for PolarDB Type − Cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle. Purpose − Suited for cloud-native, scalable workloads, ideal for modern applications requiring high scalability and ...
Read MoreData Architecture Design & Data Management
Data architecture design consists of standards that have certain rules, policies, and data types to be collected, from where the data is collected, storage of data, arrangement of data, and then using that data for further analysis. Data plays a vital role in the successful execution of business strategy. Data architecture design It helps us to show how users view the data in the database. It describes the type of data structures used to manage data and make the processing easy. the concept of dbms depends on its architecture. It is divided into three models i.e. conceptual model, ...
Read MoreJava application to insert null value into a MySQL database
In this program, we will connect to a MySQL database and insert a null value into a table using Java's JDBC API. We will use the PreparedStatement class along with the setNull() method to achieve this. After the value is inserted, you can check the table to see how the null value is reflected. Steps to insert null value into a MySQL database Following are the steps to insert null value into a MySQL database − Establish a connection to the MySQL database using the DriverManager.getConnection() method. Define the SQL query that ...
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