跳过一些使用连接生成的数字序列由

Question

Select Rownum From dual Connect By Rownum <= '4' ; 

使用该SQL列出数字1到4

我想列出1至4跳绳3，这样的结果看起来像

AM

1 
2 
4 

请帮助

Answer 1

SELECT CASE WHEN LEVEL < 3 THEN LEVEL ELSE LEVEL + 1 END AS value 
FROM DUAL 
CONNECT BY LEVEL < 4; 

或

SELECT * 
FROM (
    SELECT LEVEL AS value 
    FROM DUAL 
    CONNECT BY LEVEL <= 4 
) 
WHERE value <> 3; 

，或者因为它是不清楚你的顺序应该如何超越4进展情况，你可以这样做：

SELECT POWER(2, LEVEL - 1) AS value 
FROM DUAL 
CONNECT BY LEVEL <= 3;