你可以在CREATE TABLE语句后直接使用COMMENT ON COLUMN和COMMENT ON TABLE来添加注释。例如: CREATE TABLE employees ( employee_id NUMBER PRIMARY KEY, first_name VARCHAR2(50), last_name VARCHAR2(50), email VARCHAR2(100) UNIQUE, hire_
COMMENT ON TABLE table_name IS 'This is a description of the table.'; 为列添加注释: sql COMMENT ON COLUMN table_name.column_name IS 'This is a description of the column.'; 3. 具体的建表示例,并包含comment的使用 以下是一个包含comment的建表示例: sql CREATE TABLE employees ( employee...
CREATE TABLE EMPLOYEES (...):创建一个名为 EMPLOYEES 的表,并定义其列和数据类型。 PRIMARY KEY, UNIQUE,和 FOREIGN KEY:这些是列的约束条件。 COMMENT ON TABLE IS '员工信息表':为整个表添加注释。 COMMENT ON COLUMN EMPLOYEES.<column_name> IS '<description>':为每个列添加注释。 通过这种方式,你可以...
CREATE TABLE t1( id varchar2(32) primary key, name VARCHAR2(32) , age VARCHAR2(32) ) 添加表注释: COMMENT ON table t1 IS '个人信息'; 添加字段注释: comment on column t1.id is 'id'; comment on column t1.name is '姓名'; comment on column t1.age is '年龄';...
CREATE TABLE t1( id varchar2(32) primary key, name VARCHAR2(32) , age VARCHAR2(32) ) 添加表注释: COMMENT ON table t1 IS '个人信息'; 添加字段注释: comment on column t1.id is 'id'; comment on column t1.name is '姓名';
CREATE TABLE t1( id varchar2(32) primary key, name VARCHAR2(8) NOT NULL, age number, ) 添加表注释: COMMENT ON table t1 IS '个人信息'; 添加字段注释: comment on column is 'id'; comment on column t1.nameis '姓名'; comment on column t1.age is '年龄';...
CREATE TABLE t1(id varchar2(32) primary key,name VARCHAR2(32) ,age VARCHAR2(32) )添加表注释：COMMENT ON table t1 IS '个人信息';添加字段注释：comment on column t1.id is 'id';comment on column t1.name is '姓名';comment on column t1.age is '年龄'...
-- 创建表 CREATE TABLE employees ( employee_id NUMBER PRIMARY KEY, first_name VARCHAR2(50), last_name VARCHAR2(50), email VARCHAR2(100) UNIQUE, hire_date DATE, salary NUMBER(8, 2) ); -- 添加表级注释 COMMENT ON TABLE employees IS 'This table stores employee information.'; -- 添加列...
comment on column scott.student_info.create_dateis'创建日期';--语句授权,如:给 hr 用户下列权限 grantselect, insert, update, delete on scott.student_info to hr; 1. 复制表结构及其数据: create table table_name_newasselect*fromtable_name_old2. 只复制表结构: ...
create table OB_CALL_DATE_LOG ( CALL_ID VARCHAR2(60); PROJECT_ID VARCHAR2(30); COMMENTS VARCHAR2(200) ) 则在sql脚本中可以写: select * from OB_CALL_DATE_LOG; comment on table OB_CALL_DATE_LOG is ‘该表是话单信息表’ select * from user_tab_comments where TABLE_NAME=’OB_CALL_DAT...