Mastering Modern Databases

Data is a collection of distinct small units of information, such as text, numbers, media, bytes, etc. In computing, data is information that can be translated into a form for efficient movement and processing. It can be stored in various forms like pieces of paper or electronic memory.

A database is an organized collection of data that can be easily accessed and managed. Data in a database is organized into tables, rows, columns, and can be indexed to make it easier to find relevant information.

The word 'data' originated from the word 'datum', which means 'single piece of information'. It is plural of the word datum.

<p>Schema change statements in SQL are used to modify the structure or organization of a database's schema, such as adding or dropping tables, altering table definitions, and modifying constraints.</p> Signup and view all the answers

<p>Basic queries in SQL refer to simple queries used to retrieve specific data from a database, such as selecting specific columns from a table, filtering data using conditions, and sorting results.</p> Signup and view all the answers

<p>Data is a collection of distinct small units of information. It can be in the form of text, numbers, media, bytes, etc. Data can be stored in pieces of paper or electronic memory. The word 'data' originated from the word 'datum' which means 'single piece of information.' In computing, data is information that can be translated into a form for efficient movement and processing. Data is interchangeable.</p> Signup and view all the answers

<p>A database is an organized collection of data that can be easily accessed and managed. Data in a database is organized into tables, rows, columns, and can be indexed to make it easier to find relevant information.</p> Signup and view all the answers

<p>Schema change statements in SQL are used to modify the structure of a database, such as adding or deleting tables, columns, or constraints.</p> Signup and view all the answers

<p>Basic constraints in SQL are rules that are applied to the data in a database table to ensure its integrity. Examples of basic constraints include primary key, unique, not null, and foreign key constraints.</p> Signup and view all the answers

<p>More complex queries in SQL involve combining multiple conditions, using logical operators (AND, OR, NOT), and performing advanced operations such as joining tables, subqueries, and aggregations to retrieve specific and detailed information from a database.</p> Signup and view all the answers