如何扁平化查询到的数据

Question

我目前正在使用下面的查询来拉取相同样本记录的4行数据，并希望将其展平为每个样本1 ow。附加查询结果以获得任何帮助都是非常感谢的。

select s.name as CRF, a.name as Aliquot_Name, a.aliquot_type, au.u_step_yield as Step_Yield, au.u_step_concentration as Step_Concentration, au. u_pooled_plasma_volume as Pooled_Plasma_volume
from aliquot a 
join aliquot_user au on a.aliquot_id = au.aliquot_id 
join sample s on s.sample_id = a.SAMPLE_ID
where a.aliquot_type in ('DNA Extracted', 'Library', 'Target Enrichment', 'DNA Plasma')
order by s.name desc, a.aliquot_type, a.name, au.u_step_yield, au.u_step_concentration, au.u_pooled_plasma_volume;

CRF ALIQUOT_NAME    ALIQUOT_TYPE    STEP_YIELD  STEP_CONCENTRATION  POOLED_PLASMA_VOLUME
CRF007650   PE-0046758  DNA Plasma          10
CRF007650   LCNL-47275  Library 2,178   36  
CRF007650   HCNLS-47467 Target Enrichment   105 2   
CRF007649   1146667362  DNA Extracted   451 6   
CRF007649   PE-0046774  DNA Plasma          10
CRF007649   LCNL-47291  Library 3,543   59  
CRF007649   HCNLS-47483 Target Enrichment   132 2   
CRF007648   1146668498  DNA Extracted   166 2   
CRF007648   PE-0046755  DNA Plasma          9
CRF007648   LCNL-47272  Library 3,881   65  
CRF007648   HCNLS-47463 Target Enrichment   381 6   
CRF007647   1146635220  DNA Extracted   29  0   
CRF007647   PE-0046764  DNA Plasma          8
CRF007647   LCNL-47281  Library 1,274   21  
CRF007647   HCNLS-47473 Target Enrichment   57  1   
CRF007646   1146736347  DNA Extracted   67  1   

Answer 1

我想你得说得更具体些。没有表格信息。哪个是pk，哪个不是。我现在唯一能说的是，如果你想展平行，你必须连接同一个表。如果你想通过查询得到答案，你必须写写表的信息，其他人可以帮助人们回答你的问题。

Answer 2

据我所知，你的表格中有4个不同a.aliquot_type的条目('DNA提取‘，’文库‘，’靶浓缩‘，'DNA血浆’)。你想给出4列对应的Aliquot_Name (一列代表‘提取的DNA’等)。

您可以使用4列和一个子选择，从aliquot读取相应的数据，因此您必须退出连接

a.aliquot_id = au.aliquot_id

例如：

select s.name as CRF, (select a.aliquot_type from aliquot where a.aliquot_type = 'DNA Extracted' and ....) col1,  (select a.aliquot_type from aliquot where a.aliquot_type = 'Library' and ....) col2, ...