ORACLE SQL连接MULTI SELECT语句ORACLE

Question

I have a query I need to re-write to join multi-select statement. I have tried to write this query using join statement but am not getting the results. The error is the Invalid Identifier D_TRANS Code is below :

Answer 1

The issue lies in the ds subquery - you have the following line in the subquery generating the immediate_actions column:

WHERE  d_synergi_reference.trans = d_trans.trans

However, the table you're joining this to is d_synergi, so I suspect the line should be:

WHERE  d_synergi_reference.trans = d_synergi.trans

As an aside, I would recommend you use shorter aliases when the table names are longer than 3 or 4 characters; it's easier on the eye to read and spot issues, IMHO.