每一个数据库table都必须有一个primary key, a column that quniquely identifies each row. it can ndeve be null and must be set on record creation and never changed. 14. 创建constraint (主键) mysql>createtabledetectives (->idintnotnullauto_increment,->namevarchar(100),->phone_numbervarchar(10...
ExecuteNonQuery Executes commands such as Transact-SQL INSERT, DELETE, UPDATE, and SET statements. ExecuteScalar Retrieves a single value (for example, an aggregate value) from a database. ExecuteXmlReader Sends the CommandText to the Connection and builds an XmlReader object. You can reset the Co...
报错:Modify record by primary key is not on this table 问题原因:通常是通过Flink写入数据时选择了更新模式,但目标表没有主键,导致数据无法更新。 解决方法:为目标表设置合适的主键,详情请参见主键Primary Key。 报错:ERROR: xxx for fe ,should not be evaluated 问题原因:通常是使用某个函数查询系统表导致的...
Invoke-Sqlcmd [-AccessToken <String>] [[-Query] <String>] [-QueryTimeout <Int32>] [-ErrorLevel <Int32>] [-SeverityLevel <Int32>] [-MaxCharLength <Int32>] [-MaxBinaryLength <Int32>] [-AbortOnError] [-DisableVariables] [-DisableCommands] [-Variable <PSObject>] [-InputFile <String...
Builds commands for the given RenameSequenceOperation by making calls on the given MigrationCommandListBuilder.
inCREATE TABLE – SQLorALTER TABLE – SQLcommands, are not the same as indexes created in theINDEXcommand with theUNIQUEoption. An index created in theINDEXcommand using theUNIQUEoption allows duplicate index keys; candidate indexes do not allow duplicate index keys. For more information about th...
FireInformation, Fire* commands DTS.Pipeline: Validation phase is beginning, but never stop DTSWizard - How to generate primary keys during import from a flat file due to error 0x80070003 "The system cannot find the path specified." Dynamic connection for excel files - The connection string ...
报错:current transaction is aborted, commands ignored until end of transaction block 问题原因:通常是由于上一个Transaction的命令未执行完,又开始执行下一个命令导致报错。如: begin;createxxxxbegin; 解决方法:执行rollback;命令结束当前事务并回滚所有未提交的更改。
that have existed for some time as determined by an internal threshold, or merges compressed rowgroups from where a large number of rows has been deleted. This improves the columnstore index quality over time. For most cases this dismisses the need for issuingALTER INDEX ... REORGANIZEcommands....
When you run the specified commands, remember to replace example-Azure-AD-application-name with the name for your Microsoft Entra ID application, and assign the required roles for your needs. Start SSMS and connect to the SQL server where the Microsoft Entra ID application will access. In ...