Summary: in this tutorial, you will learn how to use the PostgreSQL RENAME COLUMN clause in the ALTER TABLE statement to rename one or more columns of a table. Introduction to PostgreSQL RENAME COLUMN clause To rename a column of a table, you use the ALTER TABLE statement with RENAME COLUMN...
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...
*删除表中的字段: alter table [表名] drop column [字段名]; *重命名一个字段: alter table [表名] rename column [字段名A] to [字段名B]; *给一个字段设置缺省值: alter table [表名] alter column [字段名] set default [新的默认值]; *去除缺省值: alter table [表名] alter column [字段...
PostgreSQLprovides aRENAME COLUMNclause that is used with the collaboration ofALTER TABLEcommand to rename a column. TheRENAME COLUMNcommand allows us to rename a single or multiple columns.PostgreSQLdoesn’t provide the“IF EXISTS”option for the“RENAME COLUMN”command. This write-up will explain ...
alter table [表名] rename column [字段名A] to [字段名B]; *给一个字段设置缺省值: alter table [表名] alter column [字段名] set default [新的默认值]; *去除缺省值: alter table [表名] alter column [字段名] drop default; *修改表中的某行某列的数据: ...
alter table [表名] rename column [字段名A] to [字段名B] 重命名一个字段 alter table [表名] alter column [字段名] set default [新的默认值] 给一个字段设置缺省值 alter table [表名] alter column [字段名] drop default 去除缺省值 insert into 表名 ([字段名m],[字段名n],...) values ...
第二步:通过下列语句转换column_name中的大写字母 SELECT exec('alter table "' || table_name || '" rename column "' || column_name || '" to ' || lower( column_name ) || ';') FROM information_schema.COLUMNS WHERE table_schema = 'public' ...
如何在不阻塞Postgresql语句的情况下执行alter table add column? 以编程方式将CSV导入PostgreSQL ALTER TABLE具有以编程方式确定的常量DEFAULT值 Alter table,以增量方式添加ID值为null的主键记录 Postgresql :我想以如下方式插入数据: 使用python以最快的方式从postgresql检索数据 ...
alter table [表名] add column [字段名] [类型]; 删除表中的字段: alter table [表名] drop column [字段名]; 重命名一个字段: alter table [表名] rename column [字段名A] to [字段名B]; 给一个字段设置缺省值: alter table [表名] alter column [字段名] set default [新的默认值]; ...
ALTER TABLE [ ONLY ] name [ * ] action [, ... ] ALTER TABLE [ ONLY ] name [ * ] RENAME [ COLUMN ] column TO new_column ALTER TABLE name RENAME TO new_name其中action 可以是以选项之一:ADD [ COLUMN ] column_type [ column_constraint [ ... ] ] DROP [ COLUMN ] column [ ...