Question

In postgresql,
I need to insert data to, say table B from sql query that get query from table A and table C.
This sample is the best that I can get:

SELECT (SELECT bic FROM bank where name='Bank Foo'), curr_id FROM currency where
alpha_id = 'AUD'
OR alpha_id ='NZD'
OR alpha_id ='SGD';


The result is something like this:

 ?column? | curr_id
----------+---------
 xyz      |      9
 xyz      |     66
 xyz      |      4

My question are :

1) how to make the result more prettier, instead of ?column? the field should show ‘bic’?

2) To insert data to table B, I think I just use COPY but I have no idea how to get data from a query statement like above. Is it possible?
Any better suggestion are welcomed.

(Usually I use COPY from csv file, ok I know you guys can say just copy paste the result to csv file and COPY but
that means I don’t learn something new 🙂

Thank you in advance.

Answer 1

1. Give the column an alias, SELECT (SELECT bic FROM bank where name='Bank Foo') bic, curr_id ...

2. INSERT INTO can take a query. e.g. INSERT INTO B SELECT (SELECT bic FROM bank where name='Bank Foo'), curr_id FROM currency where alpha_id = 'AUD' OR alpha_id ='NZD' OR alpha_id ='SGD'