如何包含作爲列值返回的總行數？

Question

的Oracle 11g

我想包括MAX（ROWNUM）作爲新列，以獲得理想的效果。實質上，我想將這個QueryA的結果作爲新的列添加到QueryB的。當我在QueryB中包含max（rownum）時，我得到'沒有單組功能。當我通過可樂或rownum進行分組時，QueryB也不起作用。

QueryA

with data_row as 
(
select 1 as col_a from dual union all 
select 2 as col_a from dual union all 
select 3 as col_a from dual) 
select max(rownum) as max_row from data_row 

QueryB

with data_row as 
(select 1 as col_a from dual union all 
    select 2 as col_a from dual union all 
    select 3 as col_a from dual) 
select col_a, rownum from data_row 

所需的結果

Col_a Rownum MaxRowNum 
-------------------------------- 
1   1  3 
2   2  3 
3   3  3 

Answer 1

可以使用analyti c形式的count函數

SQL> ed 
Wrote file afiedt.buf 

    1 with data_row as (
    2 select 1 as colA from dual union all 
    3 select 2 as cola from dual union all 
    4 select 3 as cola from dual 
    5 ) 
    6 select colA, rownum, count(*) over() cnt 
    7* from data_row 
SQL>/

     COLA  ROWNUM  CNT 
---------- ---------- ---------- 
     1   1   3 
     2   2   3 
     3   3   3