ALTER TABLE tablename RENAME TO preferredtablename; If the table name has odd characters in it, then a syntax error might be generated which can be solved by placing the table name in double quotes: ALTER TABLE "table-name" RENAME TO preferredtablename; ...
A very simple way to rename table in PostgreSQL is using alter table statement. While changing table name you would be thinking about what will happen to indexes and other constraints on the table. Obviously these questions are obvious so lets explore more about it. Overview of PostgreSQL Renam...
alter table users rename column email to emails; alter table users rename column email to emails; 1. 2. 字段重命名与修改字段是一样的语法形式:alter table...rename column ...to ... 表重命名 alter table users rename to user; alter table users rename to user; 1. 2....
*重命名一个表: alter table [表名A] rename to [表名B]; *删除一个表: drop table [表名]; [表内基本操作]=== *在已有的表里添加字段: 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...
alter table [表名A] rename to [表名B]; *删除一个表: drop table [表名]; *在已有的表里添加字段: 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] 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 ...
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]; ...
)andpid<>pg_backend_pid();-- 对表1,表2 加排他锁executeformat('lock table %I.%I in ACCESS EXCLUSIVE mode;', nsp, from_tab);executeformat('lock table %I.%I in ACCESS EXCLUSIVE mode;', nsp, to_tab);-- 切换表1,表2executeformat('alter table %I.%I rename to %I;', nsp, to_tab,...
PostgreSQL Alter Table Exercises: Write a SQL statement to rename the table countries to country_new.
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];去除缺省值:...