Re: Create index on array element?

[Jeff Davis <pgsql(at)j-davis(dot)com>]

On Wed, 2006-11-29 at 14:39 -0600, Dave Bodenstab wrote:
> I guess one cannot create an index on an element of an array?
> 
> test=> create table test ( ordinal int[] );
> CREATE TABLE
> test=> create unique index x1 on test ( ordinal[1] );
> ERROR:  syntax error at or near ")" at character 45
> LINE 1: create unique index x1 on test ( ordinal[1] );
>                                                      ^

You need more parenthesis.

test=> create unique index x1 on test ( ( ordinal[1] ) );

The reason is because "ordinal[1]" is an expression, similar to "ordinal
[1] + 5" which would also need parenthesis.

Hope this helps,
    Jeff Davis