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What are the basic concepts of SQL?

What are the basic concepts of SQL?

Below are some SQL concepts that you should know,

  • SQL is Relational Database. There are various database systems such as Relational, Hierarchical, Document, etc.
  • Keys in SQL.
  • Views in SQL.
  • SQL Joins.
  • Normalization of Database.
  • Transactions in SQL.
  • Subqueries in SQL.
  • Cloning Tables in SQL.

What are the basic concepts of database?

A database is an organized collection of structured information, or data, typically stored electronically in a computer system. A database is usually controlled by a database management system (DBMS).

What is SQL data architecture?

SQL Server database is a logical collection of data. Data is stored in two sets of files – Data Files and Log Files. An Extent consists of 8 – 8KB continuous pages and in similar manner the data file consists of extents. Log files store all modifications that are made to the database such as DDL, DML operations.

What are the 4 types of DBMS system?

Four types of database management systems

  • hierarchical database systems.
  • network database systems.
  • object-oriented database systems.

What is concept of DBMS?

A database management system (DBMS) is a software package designed to define, manipulate, retrieve and manage data in a database. A DBMS generally manipulates the data itself, the data format, field names, record structure and file structure. It also defines rules to validate and manipulate this data.

How does SQL work?

SQL is the most common language for extracting and organising data that is stored in a relational database. A database is a table that consists of rows and columns. SQL is the language of databases. It facilitates retrieving specific information from databases that are further used for analysis.

What do you need to know about SQL Server architecture?

1 General Architecture. Client − Where the request initiated. 2 Checkpoints in SQL Server. Automatic − This is the most common checkpoint which runs as a process in the background to make sure SQL Server Database can be recovered in 3 Memory Architecture. 4 Data File Architecture. 5 Log File Architecture.

Which is the simplest definition of a database architecture?

The simplest of Database Architecture are 1 tier where the Client, Server, and Database all reside on the same machine. Anytime you install a DB in your system and access it to practise SQL queries it is 1 tier architecture.

What kind of table structure does SQL Server use?

SQL Server follows a table structure based on rows, allowing connection of data and functions while maintaining the data’s security and consistency. Checks in the relational model of the server work to ensure that database transactions are processed consistently.

What are the three tiers of database architecture?

The simplest of Database Architecture are 1 tier where the Client, Server, and Database all reside on the same machine A two-tier architecture is a database architecture where presentation layer runs on a client and .data is stored on a Server 3-tier architecture is consist of the Presentation layer (PC, Tablet, Mobile, etc.),…

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