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EXISTS ( subquery ) . Nota. Para ver la sintaxis de Transact-SQL para SQL Server 2014 (12.x) y versiones anteriores, consulte Versiones anteriores de la documentación. Argumentos. subquery. Es una instrucción SELECT restringida. No se permite la palabra clave INTO.
Learn how to use EXISTS to test for the existence of rows in a subquery. See syntax, arguments, result types, and examples of comparing queries with EXISTS and other operators.
Learn how to use the SQL EXISTS operator to test for the existence of any record in a subquery. See syntax, examples and a demo database with products and suppliers.
Learn how to use the SQL Server EXISTS operator to check if a subquery returns any row. See syntax, examples, and compare with IN and JOIN operators.
The EXISTS operator returns true if the subquery returns at least one record and false if no row is selected. The database engine does not have to run the subquery entirely. If a single record is matched, the EXISTS operator returns true, and the associated other query row is selected.
What is EXISTS in SQL Server? EXISTS is a logical operator which is used to evaluate a SELECT SUBQUERY to determine whether it returns any row of information from the table. The outcome of the operation is a Boolean value which is either TRUE (1) or FALSE (0).
Para que sirve el operador EXISTS en SQL? El operador exist sql , sirve para validar si Sub-consulta posee registros. A continuación se ilustra la sintaxis del operador EXISTS: WHERE EXISTS ( subconsulta) Devuelve verdadero si contiene filas. De lo contrario, devuelve falso.
