Oracle DB 12.1.0.2 中SYS.ALL_CONSTRAINTS的定义 和 SYS.ALL_CONS_COLUMNS的定义

SYS.ALL_CONSTRAINTS的定义如下：

CREATE OR REPLACE VIEW ALL_CONSTRAINTS AS
select OWNER, CONSTRAINT_NAME, CONSTRAINT_TYPE,
       TABLE_NAME, SEARCH_CONDITION, SEARCH_CONDITION_VC,
       R_OWNER, R_CONSTRAINT_NAME, DELETE_RULE, STATUS,
       DEFERRABLE, DEFERRED, VALIDATED, GENERATED,
       BAD, RELY, LAST_CHANGE, INDEX_OWNER, INDEX_NAME,
       INVALID, VIEW_RELATED, ORIGIN_CON_ID
from INT$DBA_CONSTRAINTS
where (OWNER = SYS_CONTEXT('USERENV', 'CURRENT_USER')
       or OBJ_ID(OWNER, TABLE_NAME, OBJECT_TYPE#, OBJECT_ID) in
          (select obj# from sys.objauth$
                       where grantee# in ( select kzsrorol
                                           from x$kzsro
                                         )
          )
        or /* user has system privileges */
          exists (select null from v$enabledprivs
                  where priv_number in (-45 /* LOCK ANY TABLE */,
                                        -47 /* SELECT ANY TABLE */,
                                        -397/* READ ANY TABLE */,
                                        -48 /* INSERT ANY TABLE */,
                                        -49 /* UPDATE ANY TABLE */,
                                        -50 /* DELETE ANY TABLE */)
                  )
      )

SYS.ALL_CONS_COLUMNS的定义如下：

CREATE OR REPLACE VIEW ALL_CONS_COLUMNS
(owner, constraint_name, table_name, column_name, position)
AS
select u.name, c.name, o.name,
       decode(ac.name, null, col.name, ac.name), cc.pos#
from sys.user$ u, sys.con$ c, sys.col$ col, sys.ccol$ cc, sys.cdef$ cd,
     sys."_CURRENT_EDITION_OBJ" o, sys.attrcol$ ac
where c.owner# = u.user#
  and c.con# = cd.con#
  and (cd.type# < 14 or cd.type# > 17)   /* don't include supplog cons   */
  and (cd.type# != 12)                   /* don't include log group cons */
  and cd.con# = cc.con#
  and cc.obj# = col.obj#
  and cc.intcol# = col.intcol#
  and cc.obj# = o.obj#
  and (c.owner# = userenv('SCHEMAID')
       or cd.obj# in (select obj#
                      from sys.objauth$
                      where grantee# in ( select kzsrorol
                                         from x$kzsro
                                       )
                     )
        or /* user has system privileges */
          exists (select null from v$enabledprivs
                  where priv_number in (-45 /* LOCK ANY TABLE */,
                                        -47 /* SELECT ANY TABLE */,
                                        -397/* READ ANY TABLE */,
                                        -48 /* INSERT ANY TABLE */,
                                        -49 /* UPDATE ANY TABLE */,
                                        -50 /* DELETE ANY TABLE */)
                  )
      )
  and col.obj# = ac.obj#(+)
  and col.intcol# = ac.intcol#(+)