-- 创建新列ALTERTABLE表名ADD列名 数据类型-- 更新主键ALTERTABLE表名DROPCONSTRAINT主键名称ALTERTABLE表名ADDCONSTRAINT主键名称PRIMARYKEY(列1,列2,...)-- 重建索引ALTERINDEX索引名称ON表名 REBUILD-- 验证结果-- 检查新列是否成功添加到主键中-- 确保索引已经重建 1. 2. 3. 4. 5. 6. 7. 8. 9. 10...
sql="delete from 数据表 where 条件表达式" sql="delete from 数据表" (将数据表所有记录删除) (4) 添加数据记录: sql="insert into 数据表 (字段1,字段2,字段3 …) values (值1,值2,值3 …)" sql="insert into 目标数据表 select 字段名 from 源数据表" (把源数据表的记录添加到目标数据表) (...
ALTER TABLE table_name ADD column_name data_type [NOT NULL] [DEFAULT default_value] 参数 •table_name-要向其中添加列的表的名称。 •column_name-要添加的列的名称。 •data_type-要添加的列的数据类型。 •NOT NULL-如果该列不允许为空,则指定此选项。 •DEFAULT default_value-指定列的默认...
The default values for your column properties are added when you create a new column, but you can change them in the Column Properties tab. When you're finished adding columns, from the File menu, choose Save table name.Use Transact-SQLAdd...
(单选题) 在SQL Server中,在表中添加一个新列的正确SQL语句是( )(本题2.0分) A. ALTER TABLE ADD COLUMN 新列名 数据类型 B. ALTER TABLE ADD 新列名 数据类型 C. ALTER TABLE ALTER COLUMN 新列名 数据类型 D. ALTER TABLE MODIFY COLUMN 新列名 数据类型 相关知识点: 有机化合物 有机化合物的总论...
The default values for your column properties are added when you create a new column, but you can change them in theColumn Propertiestab. When you're finished adding columns, from theFilemenu, chooseSavetable name. Use Transact-SQL Add columns to a table ...
The default values for your column properties are added when you create a new column, but you can change them in theColumn Propertiestab. When you're finished adding columns, from theFilemenu, chooseSavetable name. Use Transact-SQL Add columns to a table ...
The default values for your column properties are added when you create a new column, but you can change them in theColumn Propertiestab. When you're finished adding columns, from theFilemenu, chooseSavetable name. Use Transact-SQL Add columns to a table ...
ALTER TABLE语句是SQL Server中用于修改已有表结构的命令。通过ALTER TABLE语句,我们可以对表进行增加、删除、修改列等操作。 2. ALTER TABLE语法格式 ALTER TABLE table_name { ADD { [ column_definition ] [ ,...n ] } | ALTER COLUMN column_name { new_data_type } [ COLLATE< collation_name > ] ...
Add-SqlColumnEncryptionKeyValue-ColumnMasterKeyName<String>-EncryptedValue<String> [-Name] <String> [-InputObject] <Database> [-Script] [-AccessToken <PSObject>] [-TrustServerCertificate] [-HostNameInCertificate <String>] [-Encrypt <String>] [-ProgressAction <ActionPreference>] [<CommonParameter...