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cd14f9ebcb
* 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
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machine_translated | machine_translated_rev |
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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.