thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-19 14:11:58 +00:00
Code Issues Packages Projects Releases Wiki Activity
2a3292cf00
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

723 B
Raw Blame History

machine_translated machine_translated_rev
true 72537a2d52

DONDE Cláusula

WHERE cláusula permite filtrar los datos que provienen de FROM 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.