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

Quizzes de desarrollo web

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The HAVING statement must be used along with the GROUP BY statement.

This query is correct: SELECT column1 FROM table1 UNION SELECT column2 FROM table2;

A primary key column can contain NULL values.

This query is correct: SELECT * FROM employee ON age = 25;

A CREATE TABLE statement is a data definition language (DDL).