mysql automatically create 3 records in table when user creates 1 in another table -

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i have table user enters records (table1) : table1 

id  name    date        desc    amt 1   fred    11/30/2015  bridge  123 2   fred    11/30/2015  tunnel  234

i need parse through table1 , create 3 records in table2 (or if name/date/desc there, update amt field) : table2 

id  name    date        desc    sortorder   amt 3   fred    11/30/2015  bridge  1           123 4   fred    11/30/2015  bridge  2           123 5   fred    11/30/2015  bridge  3           123 6   fred    11/30/2015  tunnel  1           234 7   fred    11/30/2015  tunnel  2           234 8   fred    11/30/2015  tunnel  3           234

id in each table ai key. name , date indexed , foreign keys. efficient way this? thanks!

you insert records as:

insert table2(name, date, desc, sortorder amt)     select t1.name, t1.date, t1.desc, n.n, t1.amt     table1 t1 cross join          (select 1 n union select 2 union select 3) n     on duplicate key update amt = values(amt);

note: on duplicate key update portion work, need unique index on whatever defines duplicate, perhaps:

create unique index unq_table1_4 on table1(name, date, desc, sortorder);

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