OleDbSchemaGuid.Table_Statistics 字段
定义
描述提供程序中表的可用统计集合。Describes the available set of statistics on tables in the provider.
public: static initonly Guid Table_Statistics;
public static readonly Guid Table_Statistics;
staticval mutable Table_Statistics : Guid
Public Shared ReadOnly Table_Statistics As Guid
字段值
注解
Table_Statistics 映射到 OLE DB TABLE_STATISTICS 行集。Table_Statistics maps to the OLE DB TABLE_STATISTICS rowset. 除非另外指定,否则将按以下顺序返回限制列。Unless otherwise specified, restriction columns are returned in the following order.
| 限制列Restriction column | CLR 数据类型CLR data type | 说明Description |
|---|---|---|
| TABLE_CATALOGTABLE_CATALOG | string |
此统计信息的表的目录名称。Catalog name of the table of this statistic. 如果提供程序不支持目录,则为 null 值。A null value if the provider does not support catalogs. |
| TABLE_SCHEMATABLE_SCHEMA | string |
表的架构名称。Schema name of the table. 如果提供程序不支持架构,则为 null 值。A null value if the provider does not support schemas. |
| TABLE_NAMETABLE_NAME | string |
表名。Table name. |
| STATISTICS_CATALOGSTATISTICS_CATALOG | string |
统计信息的目录名称。Catalog name of the statistic. 如果提供程序不支持目录,则为 null 值。A null value if the provider does not support catalogs. |
| STATISTICS_SCHEMASTATISTICS_SCHEMA | string |
统计信息的架构名称。Schema name of the statistic. 如果提供程序不支持架构,则为 null 值。A null value if the provider does not support schemas. |
| STATISTICS_NAMESTATISTICS_NAME | string |
统计信息的名称。Name of the statistic. |
| STATISTICS_TYPESTATISTICS_TYPE | UInt16 (Int32) |
指定此统计支持的统计信息类型的位掩码:Bitmask specifying the kinds of statistics supported by this statistic: DBSTAT_HISTOGRAM-表示直方图支持。DBSTAT_HISTOGRAM - Indicates histogram support. DBSTAT_COLUMN_CARDINALITY-指示列基数支持。DBSTAT_COLUMN_CARDINALITY - Indicates column cardinality support. DBSTAT_TUPLE_CARDINALITY-表示元组基数支持。DBSTAT_TUPLE_CARDINALITY - Indicates tuple cardinality support. Note: 直方图只对应于多列统计信息的第一列。Note: Histograms correspond to only the first column for a multi-column statistic. |