ClickHouse/docs/es/sql-reference/statements/select/where.md
Ivan Blinkov cd14f9ebcb
SQL reference refactoring (#10857)
* split up select.md

* array-join.md basic refactoring

* distinct.md basic refactoring

* format.md basic refactoring

* from.md basic refactoring

* group-by.md basic refactoring

* having.md basic refactoring

* additional index.md refactoring

* into-outfile.md basic refactoring

* join.md basic refactoring

* limit.md basic refactoring

* limit-by.md basic refactoring

* order-by.md basic refactoring

* prewhere.md basic refactoring

* adjust operators/index.md links

* adjust sample.md links

* adjust more links

* adjust operatots links

* fix some links

* adjust aggregate function article titles

* basic refactor of remaining select clauses

* absolute paths in make_links.sh

* run make_links.sh

* remove old select.md locations

* translate docs/es

* translate docs/fr

* translate docs/fa

* remove old operators.md location

* change operators.md links

* adjust links in docs/es

* adjust links in docs/es

* minor texts adjustments

* wip

* update machine translations to use new links

* fix changelog

* es build fixes

* get rid of some select.md links

* temporary adjust ru links

* temporary adjust more ru links

* improve curly brace handling

* adjust ru as well

* fa build fix

* ru link fixes

* zh link fixes

* temporary disable part of anchor checks
2020-05-15 07:34:54 +03:00

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Markdown

---
machine_translated: true
machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
---
# DONDE Cláusula {#select-where}
`WHERE` cláusula permite filtrar los datos que provienen de [FROM](from.md) cláusula de `SELECT`.
Si hay un `WHERE` cláusula, debe contener una expresión con el `UInt8` tipo. Esta suele ser una expresión con comparación y operadores lógicos. Las filas en las que esta expresión se evalúa como 0 se explican a partir de otras transformaciones o resultados.
`WHERE` expresión se evalúa en la capacidad de utilizar índices y poda de partición, si el motor de tabla subyacente lo admite.
!!! note "Nota"
Hay una optimización de filtrado llamada [preliminar](prewhere.md).