插入多行

Question

I am trying to populate multiple rows of a table with values from another table and I'm a bit stuck. This is what I have so far.

SELECT radocs_id FROM radocs ORDER BY radocs_id DESC LIMIT 1,
SELECT crew_id FROM crew,
INSERT INTO signed (radocs_id, crew_id) Values ('radocs_id', 'crew_id');

SELECT radocs_id FROM radocs ORDER BY radocs_id DESC LIMIT 1, (returns a single entry as expected)

SELECT crew_id FROM crew, (returns multiple entries as expected)

I want to create an entries in the table called 'signed' for every individual 'crew_id' with the unique 'radocs_id' but INSERT INTO signed (radocs_id, crew_id) Values ('radocs_id', 'crew_id') doesn't work.

What am I doing wrong or is this the wrong way to go about this?

Any help would be greatly appreciated.

Answer 1

Try this:

INSERT INTO signed 
(SELECT crew_id,(select radocs_id FROM radocs
                 ORDER BY radocs_id DESC LIMIT 1)
FROM crew)

Answer 2

This is the query that gets the rows you want:

SELECT r.radocs_id, c.crew_id
FROM (SELECT radocs_id
      FROM radocs 
      ORDER BY radocs_id DES
      LIMIT 1
     ) r CROSS JOIN
     crews c;

Then the insert is:

INSERT INTO signed(radocs_id, crew_id)
    SELECT r.radocs_id, c.crew_id
    FROM (SELECT radocs_id
          FROM radocs 
          ORDER BY radocs_id DES
          LIMIT 1
         ) r CROSS JOIN
         crews c;