The ENUM datatype in MySQL has three attributes. The same is described below −Default − The default value of enum data type is NULL. If no value is provided for the enum field at the time of insertion, Null value will be inserted. NULL − It works the same as the DEFAULT ...
ALTER TABLE tablename ADD (column datatype [DEFAULT expr][,column datatype]...); ALTER TABLE tablename MODIfy (column datatype [DEFAULT expr][,column datatype]...); ALTER TABLE tablename DROP (column); 1. 2. 3. 4. 5. 6. 7. 例子: 在users表中添加两条记录 AI检测代码解析 mysql> ...
13.3.5 The ENUM Type AnENUMis a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time. SeeSection 13.3.1, “String Data Type Syntax”forENUMtype syntax and length limits. ...
How to use enum : ENUM « Data Type « SQL / MySQLSQL / MySQL Data Type ENUM How to use enum /* mysql> select * from employee_person; +---+---+---+---+---+---+---+---+---+ | id | address | phone | email | birthday | sex | m_status | s_name | children...
(and MysqlDataReader.GetFieldType comes back with the type of : VARCHAR for both ENUM or SET - I tried changing the field in mysql to both of those types). I have tried all the methods I could find for "MysqlDataReader" and they all seem to return, if they return anything ...
ColumnDataType CompleteDatabaseRestoreDefinition ConnectionPolicyName CopyLongTermRetentionBackupParameters CreateDatabaseRestorePointDefinition CreatedByType CreateMode 数据库 DatabaseAdvancedThreatProtection DatabaseAdvancedThreatProtectionListResult DatabaseAdvancedThreatProtectionSettings DatabaseAdvancedThreatProtectionSettin...
Typescript allows the user to use the enum type as a data type for a variable. A common example of an enum is the name of the months, where the user has to select a month defined in a year. Typescript provides both the string-based and numeric enums. ...
ANFileDatabase =3, ANRasterFile =4}ANDataType; sizeof(ANDataType) = 4 structAAA{doubled;charss;chars; }; sizeof(AAA) = 16 结果= 结构中长度最大的变量的倍数(遵循内存对齐的原则),如上,double 的长度为 8, 则整个为 8*2 = 16, 因为 char 长度为1,两个char 为2,仍小于8,故按8计算,...
CredentialsType Cron CronTrigger CustomForecastHorizon CustomKeys CustomKeysWorkspaceConnectionProperties CustomMetricThreshold CustomModelJobInput CustomModelJobOutput CustomMonitoringSignal CustomNCrossValidations CustomSeasonality CustomService CustomTargetLags CustomTargetRollingWindowSize DataAvailabilityStatus DataCollectio...
TimeAggregationType TimeSeriesBaseline TimeSeriesElement TimeWindow TriggerCondition Unit VoiceReceiver WebhookNotification WebhookReceiver WebtestLocationAvailabilityCriteria WindowsEventLogDataSource WorkspaceInfo com.azure.resourcemanager.monitor com.azure.resourcemanager.mysql.fluent com.azure.resourcemanager.mysql.mode...