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  1. learnsql.es › blog › que-es-self-join-en-sql-una¿Qué es Self Join en SQL? Una explicación con siete ejemplos

    23 de jul. de 2022 · Self join es una alternativa muy popular de JOIN (unión) en SQL. Mientras que la mayoría de los JOIN enlazan dos o más tablas entre sí para presentar sus datos de forma conjunta, una self join (autounión) enlaza una tabla consigo misma.

  2. www.w3schools.com › sql › sql_join_selfSQL Self Join - W3Schools

    SQL Self Join. A self join is a regular join, but the table is joined with itself. Self Join Syntax

  3. learnsql.com › blog › what-is-self-join-sqlWhat Is a Self Join in SQL? Explaned With 7 Examples

    13 de oct. de 2020 · A self join is a special case of the SQL JOIN that links a table to itself. Learn how to use self join to process hierarchies, list pairs, or combine tables with examples and interactive exercises.

  4. www.geeksforgeeks.org › sql-self-joinSQL Self Join - GeeksforGeeks

    13 de sept. de 2024 · Self Join : Self-join allows us to join a table itself. It is useful when a user wants to compare the data (rows) within the same table. Syntax - select select_list from T t1 [Inner|Left] Join on T t2 on join_predicate.

  5. www.laescueladelsql.com › sql-self-join-ejemplosSQL SELF JOIN ejemplos - La Escuela del SQL

    28 de nov. de 2023 · El comando SQL SELF JOIN es una técnica avanzada que implica unir una tabla consigo misma. Esta práctica, conocida como autoreferencia, es útil cuando necesitas comparar filas dentro de la misma tabla.

  6. estradawebgroup.com › Post › Como-unir-una-tabla-aCómo unir una tabla a sí misma con Self Join de SQL Server

    4 de oct. de 2021 · En este tutorial, has aprendido a utilizar Self Join de SQL Server para consultar datos jerárquicos y comparar filas en una misma tabla.

  7. stackoverflow.com › questions › 3362038sql - What is SELF JOIN and when would you use it? - Stack ...

    You use a self join when a table references data in itself. E.g., an Employee table may have a SupervisorID column that points to the employee that is the boss of the current employee. To query the data and get information for both people in one row, you could self join like this: select e1.EmployeeID, e1.FirstName,