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alter table db_compensation add (
AUDIT_FLAG VARCHAR2(6),
AUDIT_USER VARCHAR2(30),
AUDIT_TIME DATE
);

添加备注:
comment on column db_compensation.AUDIT_FLAG is \'月结审核标识: 1:审核, 0:未审核\';
comment on column db_compensation.AUDIT_USER is \'审核账号\';
comment on column db_compensation.AUDIT_TIME is \'审核时间\';

添加默认值:

alter table db_compensation modify AUDIT_FLAG default \'0\'

添加表字段长度
alter table 表名 modify 字段名 varchar2(4000);

 

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