void main() { HRESULT hr; IDBInitialize* pIDBInitialize = NULL; ICommandText* pICommandText = NULL; IMultipleResults* pIMultipleResults = NULL; IRowset* pIRowset = NULL; hr = InitializeAndEstablishConnection(&pIDBInitialize); CHKHR_GOTO(hr, L"Failed to establish con...
+ <size of index n> + (<row size> * <row count>) 哈希索引的大小是在表创建时固定下来的,取决于实际 Bucket 计数。 用索引定义指定的 bucket_count 舍入为最近的 2 的幂以获取实际 Bucket 计数。 例如,如果指定的 bucket_count 为100000,则索引的实际桶计数为131072。
SELECT message_id AS Error, severity AS Severity, [Event Logged] = CASE is_event_logged WHEN 0 THEN 'No' ELSE 'Yes' END, [text] AS [Description] FROM sys.messages WHERE language_id = 1040 /* replace 1040 with the desired language ID, such as...
SELECT@nnew = OrgNodeFROMHumanResources.EmployeeDemoWHERELoginID = @newMgr;SELECT@nnew = @nnew.GetDescendant(max(OrgNode),NULL)FROMHumanResources.EmployeeDemoWHEREOrgNode.GetAncestor(1) = @nnew;UPDATEHumanResources.EmployeeDemoSETOrgNode = OrgNode.GetReparentedValue(@nold, @nnew)WHEREOrgNode....
有关BULK INSERT 语句、INSERT ... SELECT * FROM OPENROWSET(BULK...) 语句和bcp命令,请参阅批量导入和导出数据 (SQL Server)。 有关准备数据以进行批量导入的信息,请参阅准备用于批量导出或导入的数据 (SQL Server)。 BULK INSERT 语句可在用户定义的事务内执行,以便将数据导入到表或视图中。 或者,为了将多...
SELECT*FROMOPENROWSET(BULKN'D:\XChange\test-csv.csv', FORMATFILE = N'D:\XChange\test-csv.fmt', FIRSTROW=2,FORMAT='CSV')AScars; FORMATFILE = 'format_file_path' 指定格式化文件的完整路径。 SQL Server 支持两种格式化文件类型:XML 和非 XML。
SELECTROW_NUMBER()OVER(ORDERBYnameASC)ASRow#,name, recovery_model_descFROMsys.databasesWHEREdatabase_id <5; 結果集如下所示。 Row#NAMErecovery_model_desc 1master簡單 2modelFULL 3msdb簡單 4tempdb簡單 數據PARTITION BY行上的recovery_model_desc子句會在值變更時recovery_model_desc重新啟動編號。
obclient [oceanbase]>selectt.table_id,p.partition_id , p.svr_ip , p.role , p.zonefrom__all_virtual_table tjoingv$partitionponp.table_id=t.table_idwheret.tenant_id=1001andp.role=1;+---+---+---+---+---+|table_id|partition_id|svr_ip|role|zone|+---+---+---+---+--...
用户可以使用标准的SQL语法来定义对流数据的查询，如SELECT、FROM、WHERE、GROUP BY、JOIN等。Flink SQL...
COUNT(): This function is used to returns the number of table rows, including rows with null values. MAX(): This function is used to returns the largest value among the group. MIN(): This function is used to returns the smallest value among the group. SUM(): This function is used to...