select constraint_name from user_constraints where table_name='QS_JLDZB' and constraint_type='U';

------解决方案--------------------

SQL code
--SQL语句如下：
update QS_JLDZB 
    set ny = '',
        jh = '（第3层）乌201',
        qx='102夹层枪',
        db='101队',
        skfs='测试井别1',
        sklx='TCP',
        flrq='',
        jhrq='',
        flr='',
        jhr='',
        ch='2051',
        llr='',j
        sr='',
        rzbz='是',
        cyc='',
        dl='射孔枪身(内部)',
        mc_gg_xh='射孔枪WD95夹层枪身',
        bz='' 
  where id = 638;