删除外键关联:alter table ISO.PROCESS_CACHE_TD drop foreign key "F_Refere_1";
删除字段: ALTER TABLE ISO.PROCESS_QUOTA_TM DROP COLUMN ID;
删除不为空:alter table iso.RR_PROC_RUN_REPORT_TD alter column RESPON_DEPT_ID drop not null;
添加删除字段后,清理碎片: 先连接数据库db2 connect to test; db2 reorg table user;