在mysql数据库中插入另一行，其值类似于上一行

Question

I have a table like,

BatchID Volume1 Volume2 Volume3

1        3.0      4.0     5.0
1        2.0      1.0     2.0
2        1.0      2.0     4.0 
2        1.0      1.0     1.0
2        1.0      1.0     1.0

I am trying to add another batchid 3 with same volume1, volume2 and volume3 values such that it looks like (same records from batchID 2)

1        3.0      4.0     5.0
1        2.0      1.0     2.0
2        1.0      2.0     4.0 
2        1.0      1.0     1.0
2        1.0      1.0     1.0
3        1.0      2.0     4.0 
3        1.0      1.0     1.0
3        1.0      1.0     1.0

I wrote the following query

insert into table1 (BatchID,Volume1,Volume2,Volume3) Values 
(`3`,Select Volume1,Volume2,Volume3 from table1 where batchid = '2')

gives an error.

PS I know the above is not a good database design. This is over simplified version of my actual design.

Answer 1

You can use INSERT ... SELECT :

INSERT INTO table1 (BatchID, Volume1, Volume2, Volume3)
SELECT 3, Volume1, Volume2, Volume3 FROM table1 WHERE batchid = 2

Answer 2

DISCLAIMER: I haven't tested this, so try it at your own risk!

Would this work?

INSERT INTO table1 (BatchID, Volume1, Volume2, Volume3)
    SELECT 3, Volume1, Volume2, Volume3
    FROM table1
    WHERE BatchID = 2;