如何不使用觸發

Question

順序應該看起來像創建字母順序： -

A1 
A2 
A3 
B1 
B2 
B3 
C1 
C2 
C3 

Answer 1

你可以使用ROW發電機技術做到這一點。

SQL> WITH data 
    2  AS (SELECT Chr(65 + LEVEL - 1) str 
    3   FROM dual 
    4   CONNECT BY LEVEL <= 3) 
    5 SELECT str 
    6   ||column_value AS alphanumeric_sequence 
    7 FROM data, 
    8   TABLE(Cast(MULTISET (SELECT LEVEL 
    9   FROM dual 
10   CONNECT BY LEVEL < 3 + 1) AS sys.ODCINUMBERLIST)); 

ALPHANUMERIC_SEQUENCE 
----------------------------------------- 
A1 
A2 
A3 
B1 
B2 
B3 
C1 
C2 
C3 

9 rows selected. 

的LEVEL是硬編碼上面3，你可以改變它按您的要求。該示例是根據您的發佈輸出。