Re: Unexpected query plan

Dave Cramer writes:

> test=# create table custbase (phonenumber int8, svctype char, svcchoice
> char, billtype char, ctype char);
> CREATE
> test=# create index custbaseidx on custbase (phonenumber);
> CREATE
> test=# \d custbase
> Table "custbase"
> Attribute | Type | Modifier
> -------------+--------------+----------
> phonenumber | bigint |
> svctype | character(1) |
> svcchoice | character(1) |
> billtype | character(1) |
> ctype | character(1) |
> Index: custbaseidx
>
> test=# explain select * from custbase where phonenumber=5199400858;
> NOTICE: QUERY PLAN:
>
> Seq Scan on custbase (cost=0.00..25.00 rows=10 width=56)
>
> EXPLAIN
> test=# explain select * from custbase where phonenumber='5199400858';
> NOTICE: QUERY PLAN:
>
> Index Scan using custbaseidx on custbase (cost=0.00..8.14 rows=10 width=56)

This is a long-standing problem, and you picked the right workaround.
Btw., I would think that bigint is not the optimal choice for phone
numbers. I would use a character type.

--
Peter Eisentraut peter_e(at)gmx(dot)net http://funkturm.homeip.net/~peter