氮氧化合物和碳氢化合物在太阳光照射下,会产生二次污染—光化学烟雾。
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TheHRusercreatesastand-aloneprocedureasfollowsandgrantstheEXECUTEprivilegeontheproceduretomanydatabaseusers:
CREATEORREPLACEPROCEDUREcreate_dept(v_deptnoNUMBER,v_dnameVARCHAR2,v_mgrNUMBER,v_locNUMBER)BEGIN
INSERTINTOhr.departmentsVALUES(v_deptno,v_dname,v_mgr,v_loc);END;
Theusershavingpermissiontoexecutetheprocedureareabletoinsertrecordsintothe
DEPARTMENTStableeventhoughtheydonothavetheINSERTprivilegeonthetable.YouwantonlythoseuserswhohaveprivilegesontheDEPARTMENTStabletobeabletoexecutetheproceduresuccessfully.
WhatwouldyousuggesttothePL/SQLdeveloperstoachievethis()
生态文明包含的内容生态文明包含着下述三个相互区别、相互联系的层面: