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On 05/14/07 03:27, Sim Zacks wrote:
> Is a primary key an implicit index, or if I want to join on that field
> is it also worthwhile to make an explicit index?
On-line documentation is such a wonderful resource...
http://www.postgresql.org/docs/7.3/interactive/sql-createtable.html
PostgreSQL automatically creates an index for each unique
constraint and primary key constraint to enforce the uniqueness.
Thus, it is not necessary to create an explicit index for
primary key columns.
(Yes, I purposefully used the doc set of an ancient version.)
- --
Ron Johnson, Jr.
Jefferson LA USA
Give a man a fish, and he eats for a day.
Hit him with a fish, and he goes away for good!
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