Amazon Redshift dejará de admitir la creación de nuevas UDF de Python a partir del parche 198. Las UDF de Python existentes seguirán funcionando hasta el 30 de junio de 2026. Para obtener más información, consulte la [publicación del blog](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# SELECT
<a name="r_SELECT_synopsis"></a>

Devuelve filas de tablas, vistas y funciones definidas por el usuario. 

**nota**  
El tamaño máximo de una instrucción SQL es de 16 MB.

## Sintaxis
<a name="r_SELECT_synopsis-synopsis"></a>

```
[ WITH with_subquery [, ...] ]
SELECT
[ TOP number | [ ALL | DISTINCT ]
* | expression [ AS output_name ] [, ...] ]
[ EXCLUDE column_list ]
[ FROM table_reference [, ...] ]
[ WHERE condition ]
[ [ START WITH expression ] CONNECT BY expression ]
[ GROUP BY ALL | expression [, ...] ]
[ HAVING condition ]
[ QUALIFY condition ]
[ { UNION | ALL | INTERSECT | EXCEPT | MINUS } query ]
[ ORDER BY expression [ ASC | DESC ] ]
[ LIMIT { number | ALL } ]
[ OFFSET start ]
```

**Topics**
+ [Sintaxis](#r_SELECT_synopsis-synopsis)
+ [Cláusula WITH](r_WITH_clause.md)
+ [Lista SELECT](r_SELECT_list.md)
+ [EXCLUDE column\$1list](r_EXCLUDE_list.md)
+ [Cláusula FROM](r_FROM_clause30.md)
+ [Cláusula WHERE](r_WHERE_clause.md)
+ [Cláusula GROUP BY](r_GROUP_BY_clause.md)
+ [Cláusula HAVING](r_HAVING_clause.md)
+ [Cláusula QUALIFY](r_QUALIFY_clause.md)
+ [UNION, INTERSECT y EXCEPT](r_UNION.md)
+ [Cláusula ORDER BY](r_ORDER_BY_clause.md)
+ [Cláusula CONNECT BY](r_CONNECT_BY_clause.md)
+ [Ejemplos de subconsultas](r_Subquery_examples.md)
+ [Subconsultas correlacionadas](r_correlated_subqueries.md)