我正在尝试解析一个字符串,以查看来自另一个表的值是否出现在任何位置。
select ROUTE,
case when ROUTE like '%' || b.AIRPORTCODE || '%' then 1
else 0 end as CLASS_B,
case when ROUTE like '%' || c.AIRPORTCODE || '%' then 1
else 0 end as CLASS_C
from FLIGHT_MESSAGE,
(select * from CLASS_B_C_AIRPORTS where CLASS_B_C = 'B') b,
(select * from CLASS_B_C_AIRPORTS where CLASS_B_C = 'C') c
CLASS_B_C_AIRPORTS表将包含机场代码(KDCA)以及是否为“B”或“C”。
在下面的示例中,ROUTE字段将包含一串文本,如:
KDCA..FLUKY.DCA246.PAUKI..MOL.FLCON6.KRIC/0127
对于这个字符串,我想返回以下内容,因为KDCA是B级机场,而KRIC是C级机场:
| ROUTE | CLASS_B | CLASS_C |
----------------------------------------------------------------------
| KDCA..FLUKY.DCA246.PAUKI..MOL.FLCON6.KRIC/0127 | 1 | 1 |
此查询当前针对此字符串为类B和类C返回0。
答案 0 :(得分:1)
我认为这就是你想要的:
SELECT ROUTE,
MAX(CASE WHEN CLASS_B_C = 'B' THEN 1 ELSE 0 END) as CLASS_B,
MAX(CASE WHEN CLASS_B_C = 'C' THEN 1 ELSE 0 END) as CLASS_C
FROM FLIGHT_MESSAGE fm JOIN
CLASS_B_C_AIRPORTS a
ON fm.ROUTE LIKE '%' || a.AIRPORTCODE || '%'
GROUP BY ROUTE;