SQL Server - 创建过滤的索引

Question

我有一个带有dateTime列的表,我想在其中放置一个过滤的索引.该指数将每周重建一次.每次重建时,我希望它包含两天及更新的行,基于此列.我可以创建这样的过滤索引吗？我尝试了各种方法,我得到语法错误.

例如,索引创建的以下Where子句不起作用:

WHERE (ReadTime > DateAdd(dd,-2,GetDate()))

Answer 1

您不能通过getdate()直接引用来完成此操作.您需要动态SQL.

该CREATE INDEX语法只允许对一个恒定的比较.

CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name 
    ON <object> ( column [ ASC | DESC ] [ ,...n ] ) 
    [ INCLUDE ( column_name [ ,...n ] ) ]
    [ WHERE <filter_predicate> ]
    ... /*Irrelevant grammar removed*/

<filter_predicate> ::= 
    <conjunct> [ AND <conjunct> ]

<conjunct> ::=
    <disjunct> | <comparison>

<disjunct> ::=
        column_name IN (constant ,...n)

<comparison> ::=
        column_name <comparison_op> constant

<comparison_op> ::=
    { IS | IS NOT | = | <> | != | > | >= | !> | < | <= | !< }