Thread: postgres insert + select + values - Pgsql 9.5

On 16/09/16 07:45, Patrick B wrote:
> Hi guys,
>
>
> I got the test1 table with three columns:
>
>     id(BIGINT) - j_id(BIGINT) - comments(CHARACTER VARYING)
>
>
> *This needs to be done 180 times:*
>
>     INSERT INTO test1 (id,j_id,comments) VALUES (default,123321,'test-1
>     - comments');
>     INSERT INTO test1 (id,j_id,comments) VALUES (default,123322,'test-1
>     - comments');
>     INSERT INTO test1 (id,j_id,comments) VALUES (default,123323,'test-1
>     - comments');
>     INSERT INTO test1 (id,j_id,comments) VALUES (default,123324,'test-1
>     - comments');
>     INSERT INTO test1 (id,j_id,comments) VALUES (default,123325,'test-1
>     - comments');
>
>
> *However, I have to get j_id from another table:*
>
>     select j_id from test2 WHERE customer_id = 88897
>
>
>     17012651
>     17012601
>     16623374
>     16808986
>     16843879
>     16808794
>     16870199
>     16870488
>     16870443
>     16870403
>
>
>
> *Example of what I need:*
>
>     INSERT INTO test1 (id,j_id,comments) VALUES
>     (default, 17012651,'test-1 - comments');
>     INSERT INTO test1 (id,j_id,comments) VALUES
>     (default, 17012601,'test-1 - comments');
>     INSERT INTO test1 (id,j_id,comments) VALUES
>     (default, 16623374,'test-1 - comments');
>     INSERT INTO test1 (id,j_id,comments) VALUES
>     (default, 16808986,'test-1 - comments');
>     INSERT INTO test1 (id,j_id,comments) VALUES
>     (default, 16843879,'test-1 - comments');
>
>
> etc...
>
> How can I do that? If the customer_id is the same for all those 180 rows?

A select can make up columns too, not just what you've got in a table,
so you can:

select j_id, 'test-1 - comments' as comment from test2 where
customer_id=88897;

and then you can simply insert that into your other table (you don't
need to specify the columns that are getting a default value):

insert into test1 (j_id, comments)
select j_id, 'test-1 - comments' as comment from test2 where
customer_id=88897;

https://www.postgresql.org/docs/current/static/sql-insert.html has more
info.

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On 16/09/16 08:07, Patrick B wrote:
>
>
>     A select can make up columns too, not just what you've got in a table,
>     so you can:
>
>     select j_id, 'test-1 - comments' as comment from test2 where
>     customer_id=88897;
>
>     and then you can simply insert that into your other table (you don't
>     need to specify the columns that are getting a default value):
>
>     insert into test1 (j_id, comments)
>     select j_id, 'test-1 - comments' as comment from test2 where
>     customer_id=88897;
>
>     https://www.postgresql.org/docs/current/static/sql-insert.html
>     <https://www.postgresql.org/docs/current/static/sql-insert.html> has
>     more
>     info.
>
>
> Thanks Chris!
>
> But the problem is that test2 table has 180 rows with different j_id and
> I need to insert each one of them into test1 table.
>
> How can I do that?
> select j_id FROM test2 - will return 180 rows
>

If your select returns 180 rows, then an `insert into select` query
would insert 180 rows (assuming other constraints like primary / unique
keys are met).

--
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http://www.designmagick.com/