On 2/15/23 21:45, Laurenz Albe wrote:
On Wed, 2023-02-15 at 10:20 -0600, Ron wrote:
On 2/15/23 02:46, Laurenz Albe wrote:
[snip]
Both are the same.
There is an old myth that says that you should use the more selective column first
(which would be "code"), but that is just a myth.
Only on Postgresql?
No, on all relational databases that use B-tree indexes.
Not only is "all" is a very absolute word (I know of a counter-example), but
querying on the second segment means that you have to scan the whole tree
instead of isolating one sub-branch.
--
Born in Arizona, moved to Babylonia.
