The Tech Storror

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Query,Basic Sub-Query,Complex Sub-Query Query A database query is the use of a select statement to display desired information based on conditions from one or more tables. Different tables in the database store different information. By using query user can view his desired information as desired. For example, let's say that the employees database contains information about many employees. It can display the results of any employee who has joined in the last one year. Use of Select statement: A command of data query language is select statement. A database query is created using SQL statements. A select statement can be used to display data from multiple columns from one or more tables. But remember that select is not an independent statement. It must be accompanied by one or more other clauses for it to work. Some clauses must be used with this, while some clauses are optional. The most commonly used statement in SQL queries is the select statement. Form clause must be used with t...

 View A view is a virtual table. A view looks like a table and works like a table. Apparently it will seem so to the user. In fact, a view is a table built with predefined queries. Some rows or all rows can be shown conditionally between views. Views can be created with one or more tables. When creating a view, the SELECT statement is actually executed, with which the view is created. The SELECT statement used to create the view can use only column names or more complex functions or calculated fields. A view is a predefined query stored in the database, which looks like a table and is used like a table, but which does not occupy any space in the database. A view is created in a database using the create view statement. A new view can be created from data from a single table, multiple tables or any other view. That user must have the necessary privileges to create the view. The syntax of the create view statement is as follows: CREATE [OR REPLACE] [ALGORITHM = (UNDEFINED | MERGE | T...

 Index Large books have indexes or indexes at the end to facilitate the search for various topics. Through it, it is known that a topic has been discussed on some page of that book. In the case of database also there is system of such index to find various data quickly. Such indexes increase the performance of searching for any information in the database. Simply put, an index is a pointer to data in a table. The created index is stored in a different location from that table. The main purpose of the index is to speed up data retrieval from the database. Indexes can be created or deleted without changing the data. However, queries may take longer if an index is deleted. Keep in mind that indexes occupy physical space and in some cases may be larger than the original data table. Databases need to create indexes to increase query performance. Indexes can be created during table creation or later. The create index statement creates an index for a column in a table. However, it should ...

 Synonyms in Database A synonym is another name for a table or view. Synonyms are used so a table name does not need to be qualified by specifying another user name. Typically database administrators create and manage synonyms. And synonyms created by themselves are managed by the owners of all those synonyms. Since there are two types of synonyms, creating these will require two types of system-level privileges. Generally, all users can create synonyms with the private option. However, to develop synonyms with the public option, the user must be a database administrator or have that level of privilege. But MySQL server doesn't support synonyms yet.

Question-1. What is data type? Answer: In our daily life we ​​have to work with a lot of data. That is why the use of database for personal and institutional needs is increasing day by day. And the database means a collection of many different types of data. Different types of data are divided into categories according to application or use. These different types of data are called data types. When creating a database in Microsoft Access, it is necessary to determine what type of data will be stored in which field. Database programs perform different operations based on the type of data. Any data entry cannot be done in any field. For example - text for data like letters or letters, numbers for data like numbers or numbers etc. Question-2. What are field properties? Or, what are field properties? Answer: Database has some properties for each field of data table. Field properties are displayed depending on the data type. These data properties determine the shape of the field, how the da...

MySQL MySQL key and its main features: The role of database in website development is different. The database is actually like a drugstore where different medicines are arranged in different directions, so that it is convenient to find them later, we can organize the information in the database as well. Let's talk about Facebook. Here the information of hundreds of crores of people including name, photo, date of birth, preferences etc. are stored in the database of Facebook, now if someone clicks on a name or searches a name or email etc. in the search box, then Facebook goes to the database inside it and finds that name or email. Extracts and presents its information to us. Now these tasks have to be done by creating the database, so that the information from here can be displayed on the web page. The software required for this is called RDBMS (Relational Database Management Software). Here we will see how to create database with MySQL database software. It is widely used in creat...

  Data Encryption & Decryption  Data Encryption: Data encryption is to keep data safe from the use of unauthorized persons/organizations. Encrypted data usually prevents unauthorized persons/institutions from accessing the data. The source or sender of the data encrypts the data using specific codes. When the data reaches the destination or recipient, the data has to be decrypted before use. In this case, the sender has to inform the Encrypt rule or the Decrypt rule to the recipient. The original message is changed by decrypting the encrypted data using the same method or algorithm. Different methods of data encryption: There are various types of data encryption rules in use, viz (i) Caesar Code and (ii) Data encryption standards. The Caesar code has been used to encrypt data since the time of Roman Emperor Julius Caesar. The Data Encryption Standard-DES invented by the American National Bureau of Standard NBS is the most widely used encryption method. The method of encryp...

Entity Relationship Diagram It is also possible to show the logical structure or relationships of a database using a block diagram, called an entity relationship diagram. It is much easier to understand the whole thing with the help of block diagram than to describe it in writing. There are some general rules to follow for expressing the database using block diagrams. Apart from that some symbols can be used. The symbols used carry special meanings. Examples of Basic Symbols Used in NTT Relationship Diagrams--- Several symbols can be used to show the logical structure or relationships of a database using block diagrams as well. The symbols used carry special meanings. Some of the common symbols used in the NTT relationship model are--- Rectangle -- Set entity Ellipse- attribute Diamond -- Relationships Straight line -- contains attributes and connectors of NTT sets and NTT sets.

Primary Key, Candidate Key & Foreign Key Primary Key: A file contains one or more fields. There is at least one field in this field, whose data is one and unique, that is, each data in that field will be different, such as bank customer account number. There can be only one account with the same number in a particular bank. So the field data which is unique in a file is called primary key. Relational databases are created by establishing relationships between multiple files with the help of primary keys. Candidate Key:  If two or more attributes or sets of attributes can collectively identify an entity set, it is called a candidate key. One of these candidates is considered the primary key and the rest are called alternate keys. Foreign Key: In case of relational table, if one of the primary keys is used in another table, then that key is called foreign key.

Relationship & Entity Set   Relation: To work with large amount of data, different types of data tables have to be created. Various types of data can be presented and used as desired by establishing relationships between data in one data table and another data table. The relationship between data in one data table and data in one or more data tables is called a relation. All the data tables in which the relation is to be established must have at least one common field. Relationships are established based on this common field. Data relationships cannot be created at will. For this, some conditions have to be met, such as-  (i) A relational data table should have a common field, which field name, data type, field size format, etc. should be exactly the same. (ii) A field in a relational data table is identified as a primary key. Relationship Benefits: Establishing relationships between multiple data tables provides many benefits. Some of the notable ones are-- (i) It is easy...

Data Model & Classification of Data Model Data model: Collection of conceptual tools for describing data, data relationship, data semantic and data consistency constraints. There are 3 types of data model namely-- (i) Object Based Logical Model (ii) Record Based Logical Model (iii) Physical model. Object Based Logical Model and its Classification: The model used to describe data at logical and view level in database management is called Object Based Logical Model. There are 4 types of Object Based Logical Model namely- (1) Entity Relationship Model (ii) Object Oriented Model (iii) Semantics Data Model (v) Functional Data Model. Record Based Logical Model and Classification Record Based Logical Model : The type of data model used in database management for describing data at logical and view level is called Record Based Logical Model. However, this model is more used in specifying the Logical Structure of the database and also in providing Higher Level Description for the Implementa...

Data Manipulation Language A data manipulation language is a language that allows the user to read, add, and delete previously stored data from a database. Functions in the Data Manipulation Language or DML can be used directly by application programs in the data management system. E.g.- Employee Name entity set or file has attributes Employee Name, Employee ID Number, Last Name, Address etc. Now if you need to see the name and surname of the employees from among them, then it is possible to see it with data manipulation language. There are two types of data manipulation languages ​​namely--  (i) Procedural (ii) Non-Procedural. Description of Data Manipulation Language Statements: (i) Select statement SQL language Select statement is used for data retrieval. It can also be used to select data from multiple relations. Syntax of SELECT statement- SELECT [district]<target list> from <relation list> [ where <predicate >] (ii) UPDATE statement UPDATE statement is used ...

Data Dictionary Database data is organized in data dictionary. A data dictionary is nothing but a database. Any database user can learn about the shape, nature, etc. of each data using the data dictionary. Data dictionary function-- (i) Concept of shape nature of database (ii) Organize the database (iii) Describe the database (iv) Examining the database file.

Instance & Schema | Instance A collection of data stored in a database at a given time is called an instance. That is, the collection of information from the database at a specific time is called an instance. For example, a record variable (Variable) of a person, whose fields are Name, Address, Date of birth, etc. The Value of that person variable at a particular moment is the instance. | Schema The basic structure of a database is called a schema. The database administrator creates the core database schema and defines the various databases used by the database. These are later converted into data definition language by the compiler to be usable. These are stored permanently in the data dictionary; Eg- A house will be built. According to the schema definition, the database administrator's job is to determine what will be in the house and determine how many bedrooms the house will have, whether it will have a kitchen, dining space, etc. | Schema according to labels There are dif...

Client Server & Distributed Database Client Server: The current era is the era of information technology. And in this era everything is normal to be covered by computer network. Computer networks can be of different types. PC based network based on client server software is called client server. Client server network is the most accepted and trusted network. Client-server databases are used in cases where multiple users need to work at the same time or at different times through the same database connection. In this system there is a central computer, called the server computer and the computer/terminal connected to it is called the client. The main database is permanently stored on the server and remote users can access the server computer's database by connecting to the client, server computer. The client can share all the resources of the server. Again, the server computer can also assist the client computer if necessary. The operation of client server database can be divid...

Types of data view labels  There are three types of data view labels, complete with-- (i) External View (ii) Conceptual view (iii) Internal view to describe briefly--- (i) External view  : External view or user view is the topmost position of the database system. An external view is described by an external schema (schema). Entities, Attributes, Relationships etc are all covered. The external label contains the client itself. A customer of any scheme can get the loan related information as per his/her need by going down. But the status of the customer is not possible after knowing the insider of the other. (ii) Conceptual Global View: It is described by the conceptual schema, including all the entities in the label database and the relationships between them. A schema indicates the flow of information from the internal view. For example, the responsibility of the schema rests with the head of the ownership party. Those who can transact with customers can say that customers h...

Attribute, Entity, Data value Attribute Fields or items or elements used to express the properties of an entity are called attributes. For example, a teacher's name, address, phone number, department, etc. is an attribute. Attributes can be of two types. (i) Simple Attributes (eg Name, Address etc.) (ii) Composite Attributes (eg – First Name, Last Name, Road No., House No., Area etc.).  Entity Entity is the main unit required for standard classification of real or non-real objects. The entity may have real presence or it may be based only on concept. Examples of data entities are building, room, chair, business contract, syllabus, machine, employee, country, nation, student, teacher etc. Of course NT will have some properties. Eg - student is an entity whose attributes are student name, roll no, age, class etc. An entity type or entity set for an organization is a set of similar 'objects' containing data related to that organization. So the entities associated with the subj...

Elements of Database Environment Building a database system requires a modern database environment. Modern database environments require different components. The following shows the major components of a modern database environment and their interrelationships. (i) Computer Aided Software Engineering Tools -CASE Tools: A type of software tools, which automatically help the system development process. Case tools are used in database design and application programming. (ii) Repository: It is a central knowledge repository, which contains data descriptions, data relationships, forms and report formats and other components of the system. Various components of database management system like other components of information system are stored in this repository. (iii) Database Management System: A database management system is a set of software used to create, modify, store, control and manage databases. Databases and repositories can be created, maintained, and controlled, usually through c...

Types of Database Management System Database management systems can be divided into various categories, namely, client server databases, distributed databases, hypermedia and web databases. They are described below: Client Server Database: In the client server network system, the server and the work station are both processed, that is, both the server and the workstation can work. As a result, certain tasks can be outsourced to servers and workstations as needed. Workstations can use the server's resources and the server can assist the workstation in processing tasks. Client server database is established based on this concept. The client sends a request to the server to obtain a service; The server provides data or services according to the client's request and other rules. The operation of client server database can be divided into two, namely— (1) Front-end  (ii) Back End The front end of the database system consists of several tools such as forms, reports, graphical user i...