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SQL

SQL (Structured Query Language) is a standard programming language used to manage and query data stored in relational databases. It lets you retrieve information (e.g., “show all customers from a specific city”), insert new records, update existing data, and delete records. SQL is widely supported by database systems s

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  1. What is SQL?

    SQL (Structured Query Language) is a standard programming language used to manage and query data stored in relational databases. It lets you retrieve information (e.g., “show all customers from a specific city”), insert new records, update existing data, and delete records. SQL is widely supported by database systems such as PostgreSQL, MySQL, SQL Server, and Oracle.

  2. Common SQL tasks

    Typical SQL operations include: - Querying (SELECT): read data and filter/sort it (e.g., WHERE, ORDER BY). - Joining (JOIN): combine rows from multiple tables based on related keys. - Modifying data (INSERT/UPDATE/DELETE): change records. - Defining structure (DDL): create or alter tables and indexes (e.g., CREATE TABLE, ALTER). - Controlling access (DCL): manage permissions (e.g., GRANT, REVOKE).

FAQ

Is SQL the same as a database?

No. SQL is the language you use to work with databases; the database is the system that stores and executes those commands.

Do I need SQL to use a database?

Often yes for direct querying and administration, though some tools provide visual interfaces that generate SQL behind the scenes.

Is SQL portable across different databases?

Mostly, but there are differences in features and syntax between database vendors, so some queries may need adjustment.

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