将表中一列现有的数据插入到另一列中
insert into JNSWGS_BS.Jlwaterflow(BSM) select distinct BSM from JNSWGSSDE.JSSBPT where BSM is not null
给表中某列赋予一个随机值
update JNSWGS_BS.Jlwaterflow set waterflow=dbms_random.value(50,100)
给表中某列赋予当前时间
update JNSWGS_BS.Jlwaterflow set realtime=sysdate