3. 3. 使用ALTER TABLE语句修改字段长度 使用ALTER TABLE命令来修改字段的长度。以下是修改字段的具体代码: -- 修改字段长度ALTERTABLEemployeesALTERCOLUMNlast_nameVARCHAR(100);-- 这条语句将employees表中的last_name字段的长度修改为100 1. 2. 3. 4. 4. 验证修改是否成功 可以使用sp_help命令来查看表的结构...
现在需要将"FirstName"字段的类型长度修改为VARCHAR(100)。 -- 查询表的结构EXECsp_columns'Customers'-- 创建备份SELECT*INTOCustomers_BackupFROMCustomers-- 修改字段类型长度ALTERTABLECustomersALTERCOLUMNFirstNameVARCHAR(100)-- 删除唯一约束ALTERTABLECustomersDROPCONSTRAINTUC_Customers_FirstName-- 修改字段类型长度A...
AlterResourcePoolStatement AlterRoleAction AlterRoleStatement AlterRouteStatement AlterSchemaStatement AlterSearchPropertyListStatement AlterSecurityPolicyStatement AlterSequenceStatement AlterServerAuditSpecificationStatement AlterServerAuditStatement AlterServerConfigurationBufferPoolExtensionContainerOption AlterS...
方法二 mysql 批量为表添加多个字段 alter table 表名 add (字段1 类型(长度),字段2 类型(长度),字段3 类型(长度)); 3.删除一个字段 4.修改一个字段 5.批量修改字段名称 例子: 6,添加注释 7,调整字段顺序: alter table 表名 change 字段名 新字段名 字段类型 默认值 after 字段名(跳到哪个字段之后) ...
AlterTableAlterColumnOption Enum Reference Feedback Definition Namespace: Microsoft.SqlServer.TransactSql.ScriptDom Assembly: Microsoft.SqlServer.TransactSql.ScriptDom.dll Package: Microsoft.SqlServer.TransactSql.ScriptDom v161.8901.0 The options for alter column version of alter table statement. Add...
The options for alter column version of alter table statement. AddRowguidcol, DropRowguidcol can only happen if there is no DataType.
AlterTableAlterColumnOption Enum Reference Feedback Definition Namespace: Microsoft.SqlServer.TransactSql.ScriptDom Assembly: Microsoft.SqlServer.TransactSql.ScriptDom.dll Package: Microsoft.SqlServer.TransactSql.ScriptDom v161.8901.0 The options for alter column version of alter table statement. Add...
AlterQueueStatement AlterRemoteServiceBindingStatement AlterResourceGovernorCommandType AlterResourceGovernorStatement AlterResourcePoolStatement AlterRoleAction AlterRoleStatement AlterRouteStatement AlterSchemaStatement AlterSearchPropertyListStatement AlterSecurityPolicyStatement AlterSequenceStatement AlterServerAuditSpec...
How to change the column size of the salary column in the employee table from numeric(18,0) to numeric(22,5) sql sql-server database t-sql alter-table Share Improve this question Follow edited Jul 7, 2018 at 6:14 Sreedhar Danturthi asked Apr 13, 2012 at 9:09 Sreedhar ...
Requires ALTER permission on the table. Use SQL Server Management Studio (SSMS) Modify the data type of a column using SSMS InObject Explorer, right-click the table with columns for which you want to change the scale and selectDesign. ...