這並不會觸發重新編譯:由同一 query_plan_hash 及query_hash 值可證,這兩個項目都會參考相同的計畫與查詢。實際上,這表示在快取中我們會有兩個計畫項目對應到至相同的批次,顯示確認會對 SET 選項造成影響的計畫快取相同十分重要,當重複執行相同的查詢時,須最佳化以利計畫重複使用,以及將計畫快取大小維持在其所...
表屬性是鍵-值對,您可以在執行CREATE TABLE或CREATE VIEW時初始化。 您可以使用或SET,ALTER TABLE現有或ALTER VIEW新的或現有的資料表屬性。 您可以使用資料表屬性來標記數據表,其中包含 SQL 未追蹤的資訊。 數據表選項 數據表選項的目的是將記憶體屬性傳遞至基礎記憶體,例如SERDE屬性至Hive。 ...
Specifies the collation of the column. If not specified, the column is assigned the default collation of the database. Collation name can be either a Windows collation name or a SQL collation name. For a list and more information, seeWindows Collation NameandSQL Server Collation Name. ...
Before it compiles a query, the Query Optimizer uses the columns, tables, and indexed views in the query predicate to determine which statistics might be out-of-date. Before it executes a cached query plan, the Database Engine verifies that the query plan references up-to-date statistics. ...
This is a list of the catalog views that are visible to the public role.sys.partition_functions sys.partition_schemes sys.filegroups sys.database_files sys.partitions sys.schemas sys.sql_dependencies sys.parameter_type_usages sys.partition_range_values sys.data_spaces sys.destination_data_spaces ...
要在查询级别完成此操作,请添加 USE HINT 'EXPAND VIEWS' 查询提示,而不是使用此跟踪标志。 有关详细信息,请参阅表提示 (Transact-SQL)。适用于:SQL Server 2019 (15.x) CU 23 及更高版本。范围:仅全局。 9347 禁用Sort 运算符的批处理模式。 SQL Server 2016 (13.x) 引入了新的批处理模式 Sort 运算...
This removes thewalking_scheduleview from your database, but none of the view’s data will be deleted unless you remove it from the base tables. Conclusion By reading this guide, you learned what SQL views are, how to create, query, change, and delete them from a database. You also le...
AS_OF_JOIN 错误 CANNOT_CREATE_DATA_SOURCE_TABLE 错误 CANNOT_LOAD_STATE_STORE 错误 CANNOT_QUERY_TABLE_DURING_INITIALIZATION 错误 CANNOT_READ_FILE 错误 CANNOT_UPDATE_FIELD 错误 CANNOT_WRITE_STATE_STORE 错误 CAST_INVALID_INPUT 错误 CF_FAILED_TO_INFER_SCHEMA 错误 CODEC_NOT_AVAILABLE 错误 COLLATION_MI...
You can select the query and save your query as a view using the Save as view button. Select the schema name that you have access to create views, provide name of view and verify the SQL statement before confirming creating view. When view is successfully created, it appears in the ...
When you partition a non-unique, clustered index, the Database Engine by default adds the partitioning column to the list of clustered index keys, if it is not already specified. When partitioning a non-unique, nonclustered index, the Database Engine adds the partitioning column as a non-key...