Oracle中with关键字的使用

 open p_cr1 for
      with sqla as
       (select d.*,
               (select c.STATICMONTH
                  from ly_zg_jzfbtstatic c
                 where c.ID = d.STATIC_ID) as STATICMONTH
          from tablename1 d
         where d.STATIC_ID in
               (select r.ID
                  from ly_zg_jzfbtstatic r
                 where to_char(r.STATICMONTH, 'yyyy') = varYear)
           and d.DISTNAME = '合计'),
      sqlb as
       (select d.*,
               (select c.STATICMONTH
                  from ly_zg_lzzfbtstatic c
                 where c.ID = d.STATIC_ID) as STATICMONTH
          from tablename2 d
         where d.STATIC_ID in
               (select r.ID
                  from ly_zg_lzzfbtstatic r
                 where to_char(r.STATICMONTH, 'yyyy') = varYear)
           and d.DISTNAME = '合计'),
      sqlc as
       (select d.*,
               (select c.STATICMONTH
                  from ly_zg_lzfbtstatic c
                 where c.ID = d.STATIC_ID) as STATICMONTH
          from tablename3 d
         where d.STATIC_ID in
               (select r.ID
                  from ly_zg_lzfbtstatic r
                 where to_char(r.STATICMONTH, 'yyyy') = varYear)
           and d.DISTNAME = '合计'),
      sqld as
       (select a.STATICMONTH,
               (a.newscount + b.newscount + c.newscount) newscount,
               (a.SYCOUNT + b.SYCOUNT + c.SYCOUNT) SYCOUNT,
               (a.NEWGCOUNT + b.NEWGCOUNT + c.NEWGCOUNT) NEWGCOUNT,
               (a.GYCOUNT + b.GYCOUNT + c.GYCOUNT) GYCOUNT,
               (a.MSCCOUNT + b.MSCCOUNT + c.MSCCOUNT) MSCCOUNT,
               (a.MGZFCOUNT + b.MGZFCOUNT + c.MGZFCOUNT) MGZFCOUNT,
               (c.MSCCOUNT + c.MGZFCOUNT) lzfMSCCOUNT,
               (b.MSCCOUNT + b.MGZFCOUNT) lzzfMSCCOUNT,
               (a.MSCCOUNT + a.MGZFCOUNT) jzfMSCCOUNT,
               (a.newscount + b.newscount + c.newscount + a.NEWGCOUNT +
               b.NEWGCOUNT + c.NEWGCOUNT) sum1,
               (a.MSCCOUNT + b.MSCCOUNT + c.MSCCOUNT + a.MGZFCOUNT +
               b.MGZFCOUNT + c.MGZFCOUNT) sum2

          from sqla a, sqlb b, sqlc c
         where a.STATICMONTH = b.STATICMONTH
           and c.STATICMONTH = a.STATICMONTH)
           --
      select (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/01/01') as JAN,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/02/01') as FEB,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/03/01') as MAR,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/04/01') as APRIL,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/05/01') as MAY,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/06/01') as JUNE,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/07/01') as JULY,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/08/01') as AUJUST,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/09/01') as SEPT,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/10/01') as OCT,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/11/01') as NOV,
             (select newscount
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/12/01') as DECE
        from dual
      union all
      --
      select null as JAN,
             null as FEB,
             null as MAR,
             null as APRIL,
             null as MAY,
             null as JUNE,
             null as JULY,
             null as AUGUST,
             null as SEPT,
             null as OCT,
             null as NOV,
             null as DECE
        from dual
      union all
      --
      select (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/01/01') as JAN,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/02/01') as FEB,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/03/01') as MAR,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/04/01') as APRIL,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/05/01') as MAY,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/06/01') as JUNE,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/07/01') as JULY,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/08/01') as AUJUST,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/09/01') as SEPT,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/10/01') as OCT,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/11/01') as NOV,
             (select SYCOUNT
                from sqld
               where to_char(STATICMONTH, 'yyyy/mm/dd') = varYear || '/12/01') as DECE
        from dual；

当现有的表不满足我们写如意sql，或者是根据现有的表写出如意sql太过复杂，所以Oracle为我们提出了with关键字，帮我们提供了很大的帮助

住，with后面的虚拟表必须用圆括号包起来，并且括号后面必须紧连接select关键字

并且用union all 连接的行中，每行中的列数据类型必须一致，注:null兼容任意数据类型

ye。。。。。。