php - MySQL odd and even auto-incremented IDs -


i have 2 tables in mysql. both tables store same thing, 1 table stores data not final (will later changed) , 1 table stores final data.

notfinal table ---------------------- id parentid  value 1     2       0.5 2     2       0.3

.

final table ---------------------- id parentid  value 1     1       0.5 2     2       0.3 3     2       0.4

now, thing want select id of entires have parentid = 2, doesn't matter table. if select join 1,2,2,3 in case id 2 duplicate (id 2 has parentid 2 in both first , second table).

so, actual problem don't know table id came from. fix problem thinking in non-final table have odd ids , in final table have even ids. doing never result in conflicting ids , know id came table.

can set mysql auto-increment ids in first table odd , in second 1 even?

so tables this:

notfinal table ---------------------- id parentid  value 1     2       0.5 3     2       0.3

.

final table ---------------------- id parentid  value 2     1       0.5 4     2       0.3 6     2       0.4

you can use configuration options auto_increment_increment , auto_increment_offset mentioned in mysql manual.

their primary use replication, can changed in each session, can use them purpose. set them need before manipulating either of these 2 tables (change session variables, not global ones).


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