Vb.net SQL查询语句联接和并集

我写了一个SQL语句，但我不能得到想要的答案

Dim objDataAdapter As SqlDataAdapter = New SqlDataAdapter("SELECT FIBER.ID , LIST.STATION , LIST.CODE , FIBER.NUMBER , FIBER.OWNER , " _
+ " FIBER.KIND , FIBER.CORE_NUMBER , FIBER.LENGTH , FIBER.LOSS ,FIBER.COLOR , FIBER.CABINET , FIBER.R_NUMBER , NULL AS R_STATION , NULL AS R_CODE, FIBER.COMMENT FROM LIST " _
+ " INNER JOIN FIBER " _
 + " ON FIBER.NUMBER = LIST.NUM_CODE " _
 + " UNION  ALL" _
 + " SELECT FIBER.ID , NULL AS STATION , NULL AS CODE , FIBER.NUMBER , FIBER.OWNER , " _
+ " FIBER.KIND , FIBER.CORE_NUMBER , FIBER.LENGTH , FIBER.LOSS ,FIBER.COLOR , FIBER.CABINET , FIBER.R_NUMBER , LIST.STATION AS R_STATION , LIST.CODE AS R_CODE , FIBER.COMMENT FROM LIST " _
 + " INNER JOIN FIBER " _
+ " ON FIBER.R_NUMBER = LIST.NUM_CODE " _
, objConnection)

答案是

!！[我的答案必须是三条记录，但我得到了六条记录和R_代码，R_站被复制到下面三条记录中][10]

谢谢

不要使用“联合所有”，而是使用“联合”

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由于UNION会删除重复记录（结果中的所有列都相同），因此UNION all不会删除重复记录

请尝试重新表述您的问题。目前还不清楚你在问什么。看看