MYSQL – Consultas de unión interna (UNION – UNION ALL) – Video 15
En este vídeo, vamos a crear consultas de unión interna en MYSQL, utilizando el operador UNION y el operador UNION ALL. El operador UNION, nos sirve para combinar varias consultas en una sola, mostrando solamente los registros únicos; mientras que, el operador UNION ALL nos muestra todos los registros en la consulta.
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