DML数据操纵语言

delete t_hq_bm where lianxdh ='10086';                                                        删除电话为10086的列

truncate table t_hq_bm2；                                                                            删除表bm2

create table t_hq_bm2 as select * from t_hq_bm;                                           复制表 bm

create table t_hq_bm2 as select * from t_hq_bm where 1 > 2 ;                                            只复制结构不复制数据

insert into t_hq_bm2(bumbm) select bumbm from t_hq_bm where bumbm = '101';                复制数据

修改一列

update t_hq_bm set lianxdh = '10086';                                                                                                   将电话全列改为10086

update t_hq_bm set bummc ='营业部' where bumbm = '108';                                                                    将108改为营业部

update t_hq_bm t set t.bummc = '企划部',t.lianxdh = '12345' where bumbm = '106';                                  将106改为企划部电话12345

update t_hq_bm t set t.lianxdh = '23231' where t.bumbm >= '101' and  t.bumbm < '103';                         将101-102电话改为23231

update t_hq_bm t set t.lianxdh = '23231' where t.bumbm = '105'or t.bumbm = '104' or t.bumbm = '103';   将103-105电话改为23231