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";
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...
RENAME [ COLUMN ] column TO new_column ALTER TABLE name RENAME TO new_name ALTER TABLE name SET SCHEMA new_schema 这里action 是下列之一: ADD [ COLUMN ] column type [ column_constraint [ ... ] ] DROP [ COLUMN ] column [ RESTRICT | CASCADE ] ALTER [ COLUMN ] column TYPE type [ USI...
Add a constraint to a column. Rename a table To add a new column to a table, you use ALTER TABLE ADD COLUMN statement: ALTER TABLE table_name ADD COLUMN column_name datatype column_constraint; To drop a column from a table, you use ALTER TABLE DROP COLUMN statement: ALTER TABLE table...
Let’s verify the table alteration using the “\d” command: \demp_data; The “emp_age” column from the “emp_data” table has been dropped/removed. Example 3: Renaming a Column Use the “RENAME COLUMN” clause along with the “ALTER TABLE” command to rename a specific column of a...
(12,2) | | | js | json | | | postgres=# alter table md2 rename column i to z; ALTER TABLE Time: 53.794 ms postgres=# \d+ md2 Table "public.md2" Column | Type | Collation | Nullable | Default | Storage | Compression | Stats target | Description ---+---+---+---+---+...
The output verified that the“team_targets”column had been dropped from the“team_details”table using the“ALTER TABLE”command. How to Rename a Table in PostgreSQL? The“ALTER TABLE”command can be used along with the“RENAME TO”clause to rename a specific table: ...
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...
ALTER TABLE—Change the definition of a table. Synopsis ALTERTABLE<name>action[,...]ALTERTABLE<name>RENAMECOLUMN<column>TO<new_column>ALTERTABLE<name>RENAMETO<new_name>ALTERTABLE<name>{ NOPARALLEL|PARALLEL[<integer>]} actionis one of:
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: ...