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MYSQL (index (Sintaxis básica del índice de caída (Sintaxis básica del…
MYSQL
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Triggers
CREATE TRIGGER ver_salario
BEFORE UPDATE ON empleados
REFERENCING NEW ROW AS n, OLD ROW AS o FOR EACH ROW
IF n.salario <> o.salario THEN
END IF;
INNER JOIN
SELECT FROM tabla1 AS t1 INNER JOIN tabla2 AS t2 ON t1.campo=t2.campo;
SELECT FROM tabla1 AS t1 INNER JOIN tabla2 AS t2 ON t1.campo=t2.campo;
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