创建表，并复制数据

create table table1 as select * from table2;

只创建表结构，不复制数据

create table table1 as select * from table2 where 1=2;

复制表数据，两张表字段相同：(table1必须存在)

insert into table1 select * from table2;

复制表数据，两张表字段不相同：(table1必须存在)

insert into table1(field1,field2,field3) select field1,field2,field3 from table2;

删除表：

drop talbe table_name;

删除表数据：

truncate table table_name;

如果xxx表不存在某条数据，就从xxx表插入该条数据INSERT INTO tb_cablecheck_dtsj

SELECT

od.*,

'' ro_type_id

FROM

osspad.tb_cablecheck_dtsj od

WHERE

NOT EXISTS ( SELECT 1 FROM tb_cablecheck_dtsj d WHERE d.id = od.id )

带自增长id，需要写成子查询INSERT INTO tb_cablecheck_dtsj SELECT

SEQ_CABLECHECK_DTSJ_ID.nextval,

t.*

FROM

(

SELECT

d.dzid,

d.dzbm,

d.sbid,

d.sbbm,

d.glmc,

d.h,

d.install_sbid,

'' ro_type_id

FROM

osspad.tb_cablecheck_dtsj d,

area a

WHERE

d.areaid = a.area_id

AND a.parent_area_id = 20

AND d.bdsj >= TO_DATE ('2016-12-01', 'yyyy-mm-dd')

AND d.bdsj <= TO_DATE ('2016-12-31', 'yyyy-mm-dd')

) t

备份原表数据

create table tb_cablecheck_equipment_bak as select * from tb_cablecheck_equipment;

删除原表

drop table tb_cablecheck_equipment;

创建临时表create table tb_equipment_20170112 as

select e.equipment_id,

e.equipment_code,

e.equipment_name,

e.area_id,

e.address,

e.parent_area_id,

e.grid_id,

e.install_sbid,

e.install_sbbm,

e.install_dzbm,

decode(e.longitude,null,b.longitude,e.longitude) longitude,

decode(e.latitude,null,b.latitude,e.latitude) latitude,

e.station_id,

e.update_time

from tb_cablecheck_equipment e left join tb_base_equipment b

on e.equipment_id = b.phy_eqp_id and e.equipment_code = b.point_no

恢复原表并插入数据create table tb_cablecheck_equipment

as

select * from tb_equipment_20170112

查询原表

select * from tb_cablecheck_equipment

select count(1) from tb_cablecheck_equipment