ALTER TABLE

ALTER TABLE CUX_JBJT5_COA_MAPPING add remarks VARCHAR2(260);--Add fields

ALTER TABLE CUX_JBJT5_COA_MAPPING RENAME COLUMN remark TO remarks; --Rename field

ALTER TABLE CUX_JBJT5_COA_MAPPING drop COLUMN remarks;--delete fields

  

operate on fields	How to operate
update field name	alter table TABLE_NAME rename column column_old to column_new;
add field	alter table TABLE_NAME add COLUMN_NAME varchar(10);
delete field	alter table TABLE_NAME drop column COLUMN_NAME;
Add fields and append values	alter table TABLE_NAME ADD COLUMN_NAME NUMBER(1) DEFAULT 1;
Modify field value	update TABLE_NAME set filedname=value where filedname=value;
Modify field data type	alter table tablename modify filedname varchar2(20);