ALTERTABLEtable_name RENAMECOLUMNold_column_nameTOnew_column_name; 示例: 将middle_name列重命名为second_name: ALTERTABLEemployees RENAMECOLUMNmiddle_nameTOsecond_name; 6. 添加和删除约束 6.1 添加约束 要向表中添加约束,可以使用以下语法: ALTERTABLEtable_nameADDCONSTRAINTconstraint_name constraint_definition...
ALTER TABLE table_name RENAME COLUMN column_name(修改表中的列名称) ALTERTABLEmovies.movies_aliyundrive-- RENAME COLUMN "仅供学习参考使用,下载后请于24小时内删除.不" TO "分类",-- RENAME COLUMN f2 TO "名称",RENAMECOLUMNf3TO"链接";
ALTER TABLE products RENAME COLUMN product_no TO product_number; 7,给表改名字 代码示例: To rename a table: ALTER TABLE products RENAME TO items; Name ALTER TABLE -- 修改表的定义 Synopsis ALTER TABLE [ ONLY ] name [ * ] action [, ... ] ALTER TABLE [ ONLY ] name [ * ] RENAME [...
Postgres on Neon comes with instant point-in-time recovery. Get the free plan here. Summary: in this tutorial, you will learn how to use the PostgreSQL ALTER TABLE statement to modify the structure of a table. Introduction to PostgreSQL ALTER TABLE statement To change the structure of an ...
To rename a specific table in Postgres, users need to use the “ALTER TABLE” command with the “RENAME TO” clause: ALTERTABLEemp_dataRENAMETOemp_info; The above-specified statement will rename the “emp_data” table to “emp_info”: ...
RENAME TO new_view_name; ``` - 添加列 ```sql ALTER VIEW view_name ADD column_name; ``` - 删除列 ```sql ALTER VIEW view_name DROP column_name; ``` 通过这些操作,可以对视图的结构和属性进行灵活的修改和管理。 总结:Postgres中的ALTER语法提供了丰富的功能和灵活的语法,通过ALTER TABLE、ALTER...
The output verified that the“team_details”table had been renamed to the“team_info”. How to Rename a Column in Postgres? A table column inPostgreSQLcan be renamed/modified using the"ALTER TABLE"command: ALTERTABLEtbl_nameRENAMEold_col_nameTOnew_col_name; ...
在PostgreSQL中,ALTER TABLE命令用于修改现有表的结构。当对表进行大规模修改时,可能会导致ALTER TABLE执行变慢的情况。 Alter Table太慢可能由以下几个因素引起:...
SQL92 对ALTERTABLE声明了一些附加的Postgres目前还不直接支持的功能: ALTERTABLEtableDROPCONSTRAINTconstraint{RESTRICT|CASCADE} 增加或删除表的约束(比如象检查约束,唯一约束或外键约束)。要创建或删除一个唯一约束,对应地创建或删除一个唯一索引,要修改其他类型的约束,你需要重建和重载该表,使用CREATETABLE命令的其他参数...
ALTER TABLE distributors RENAME COLUMN address TO city; 1. 对现存表改名: ALTER TABLE distributors RENAME TO suppliers; 1. 兼容性 SQL92 ADD COLUMN形式是兼容的,除了上面说的缺省(值)和约束外。ALTER COLUMN形式是完全兼容的。 SQL92 对ALTER TABLE声明了一些附加的Postgres目前还不支持的功能: ...