Informática. Programación. Desarrollo web. Diseño gráfico. Redes.

Quizzes de desarrollo web

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AVG() returns the average of a numeric column.

Indexes allow the database application to find data slowly.

This query copies data from table2 to table1: INSERT INTO table2 SELECT * FROM table1;

UNIQUE and NOT NULL are contraints.

A primary key column can contain NULL values.