andmebaasipäringutes

Andmebaasipäringutes are queries used to retrieve, manipulate, or manage data stored in a database. These queries are typically written in a specific query language, such as SQL (Structured Query Language) for relational databases, or NoSQL query languages for non-relational databases. The primary purpose of a database query is to extract specific information from a database, often based on certain conditions or criteria.

In relational databases, SQL queries can be used to perform various operations, including selecting data from one or more tables, inserting new records, updating existing records, and deleting records. For example, a simple SQL query to select all records from a table named "Customers" might look like this: "SELECT * FROM Customers;".

NoSQL databases, on the other hand, use different query languages and methods depending on the type of database. For instance, MongoDB uses a query language that is similar to JSON, while Cassandra uses a query language called CQL (Cassandra Query Language).

Database queries are essential for data management and analysis, as they allow users to interact with the data stored in a database efficiently and effectively. They are used in a wide range of applications, from simple data retrieval tasks to complex data analysis and reporting.