[Rails] Re: Sql update_all with string concatenate

Marnen Laibow-Koser wrote:

> To the OP: if this column is just going to be the id with a constant
> prefix, then you don't need it in the DB!

It's initializing existing records in a migration. Over time the match
will not be present.

To the other point about "||" meaning concatenation. Thats what got me
thinking as some other SQLs use "+" and others use CONCAT().
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