Insert new row with data computed from other rows

Question

Suppose I have a MySQL table called MyTable, that looks like this:

+----+------+-------+
| Id | Type | Value |
+----+------+-------+
|  0 | A    |     1 |
|          


        

Answer 1

Just add the following line before your select statement:

INSERT MyTable (Id, Type, Value)

Answer 2

You can just append that select (slightly modified as in "you don't need the as clauses") onto an insert. For example:

insert into MyTable (Id,Type,Value)
    select MyTable_A.Id, 'C', (A_Val + B_Val) from ...

assuming that your query is actually correct - I make no evaluation of that :-)

By way of further example,

insert into MyTable (Id,Type,Value)
    select Id+1000, 'C', Value from MyTable where Type = 'A'

would add the following rows:

+------+------+-------+
| Id   | Type | Value |
+------+------+-------+
| 1000 | C    |     1 |
| 1001 | C    |     2 |
| 1002 | C    |     5 |
+------+------+-------+