1.语法:ALTER TABLE 表名 ADD CONSTRAINT 主键名 PRIMARY KEY 表名(主键字段); 3.添加外键 1.语法:ALTER TABLE 表名 ADD CONNSTRAINT 外键名 FOREIGN KEY(外键字段) REFERENCES 关联表名(关联字段); 4.插入单(多)条数据记录(和SQL Server相同,但是不能用select多列添加数据) 1.INSERT INTO 表名[(字段名...
Here,table_nameis the name of the table to which you want to add the primary key.column1, column2, ...are the names of the columns that you want to use as the primary key. You can specify multiple columns separated by commas to create a composite primary key. Example: Adding a Pri...
ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.
mbautinself-assigned thisApr 1, 2019 mbautinchanged the title[YSQL] Optimize CREATE TABLE without a primary key followed by ALTER TABLE adding a primary key should end up with one primary keyApr 2, 2019 ndeodharadded thearea/ysqllabelApr 3, 2019 ...
ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.
ALTER TABLE [dbo].[AA_BusObject] DROP CONSTRAINT [PK_student]下面是帮助里找到的信息(我是跟踪出来的,哈哈):DROP { [CONSTRAINT] constraint_name | COLUMN column_name } 指定从表中删除 constraint_name 或者 column_name。如果兼容级别小于或等于 65，将不允许 DROP COLUMN。可以列出多个列或...
当database_name是当前数据库或database_name并且table_or_view_nametempdb以#开头时,SQL 数据库支持由三部分构成的名称格式<database_name>.[schema_name].<table_or_view_name>。REBUILD [ WITH ( <rebuild_index_option> [ ,... n ] ] ]适用于:SQL Server 2012 (11.x) 及更高版本和 Azure SQL ...
ALTER SERVER AUDIT SPECIFICATION (Transact-SQL) ALTER SERVER CONFIGURATION (Transact-SQL) ALTER SERVICE (Transact-SQL) ALTER SERVICE MASTER KEY (Transact-SQL) ALTER SYMMETRIC KEY (Transact-SQL) ALTER TABLE (Transact-SQL) ALTER TRIGGER (Transact-SQL) ...
To enable a UNIQUE or PRIMARY KEY constraint, you must have the privileges necessary to create an index on the table. You need these privileges because Oracle creates an index on the columns of the unique or primary key in the schema containing the table. To enable or disable triggers, ...
此名称应在该 SQL Server 实例的所有数据库级目录名称中保持唯一。 无论排序规则如何设置,唯一性比较都不区分大小写。 在此数据库中创建 FileTable 之前,必须设置此选项。 <HADR_options> ::= 适用于:SQL Server 请参阅 ALTER DATABASE SET HADR。 <mixed_pa...