Process to search any specific data from the table is called

General
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process to search any specific data from the table is called

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LectureNotes said process to search any specific data from the table is called

Answer:
The process of searching for specific data from a table is commonly referred to as “querying”. In the context of databases and data management, querying is the act of requesting specific information by formulating queries, usually in a structured query language (SQL).

Key Concepts of Querying:

  1. Structured Query Language (SQL):

    • SQL is the standard language used to communicate with relational database management systems (RDBMS). It is designed to perform tasks such as retrieving specific data, updating records, and managing data schemas.
    • Example of a simple SQL query to retrieve data:
      SELECT * FROM table_name WHERE condition;

  2. Types of Queries:

    • Select Queries: Used to fetch data from a database.
      SELECT column1, column2 FROM table_name WHERE condition;
    • Insert Queries: Add new records to a database.
      INSERT INTO table_name (column1, column2) VALUES (value1, value2);
    • Update Queries: Modify existing records.
      UPDATE table_name SET column1 = value1, column2 = value2 WHERE condition;
    • Delete Queries: Remove records from a database.
      DELETE FROM table_name WHERE condition;

  3. Filtering Results:

    • SQL allows for the use of conditions to filter which rows are returned.
    SELECT * FROM employees WHERE age > 30 AND department = 'sales';

  4. Joining Tables:

    • Data often resides in multiple tables, and SQL supports joining tables to form more complex queries.
    SELECT employees.name, departments.name FROM employees
JOIN departments ON employees.department_id = departments.id;

  5. Indexing:

    • Indexes can be created to optimize the performance of database querying by reducing the amount of data that needs to be checked.
    CREATE INDEX index_name ON table_name (column_name);

Example of Querying Data:

To illustrate a practical querying process, let’s consider a database with a table named students:

  1. Schema for students Table:

    | id | name       | age | grade |
|----|------------|-----|-------|
| 1  | Alice      | 12  | A     |
| 2  | Bob        | 14  | B     |
| 3  | Charlie    | 13  | A     |
| 4  | Diana      | 12  | C     |

  2. Example Query: Retrieving Students Aged 12:

    SELECT * FROM students WHERE age = 12;

    Result:

    | id | name  | age | grade |
|----|-------|-----|-------|
| 1  | Alice | 12  | A     |
| 4  | Diana | 12  | C     |

Final Answer:
The process to search any specific data from a table is called querying. It typically involves the use of SQL to perform actions like selection, insertion, updating, and deletion of data within a database.