SQLlekérdezésekkel
SQL lekérdezésekkel (SQL queries) are statements used to retrieve, manipulate, and manage data in relational databases. SQL, which stands for Structured Query Language, is a standardized language for interacting with databases. It is widely used in various applications, from small-scale projects to large enterprise systems.
An SQL query typically begins with a SELECT statement, which is used to retrieve data from one
SQL also supports data manipulation through INSERT, UPDATE, and DELETE statements. The INSERT statement adds new
Joins are another essential feature of SQL queries, allowing data from multiple tables to be combined based
SQL queries can also include aggregate functions like COUNT, SUM, AVG, and MAX to perform calculations on
In summary, SQL lekérdezésekkel are fundamental for database management and data analysis. They provide a powerful