In response to Atif Jung :
> If I have a table as follows:
>
> CREATE TABLE test1 (a char(5));
>
> how would I test that the 2nd character of column a is NOT the letter 'b' for
> example.
>
> In Informix I would say:
>
> SELECT count(*) FROM test1 where a[2] <> 'b';
>
> In POSTGRES I get an error saying "ERROR: cannot subscript type character
> because it is not an array". I understand why I'm getting the error, but I'm
> not sure how I do what I want to do?
You can use the substring() - function:
test=# CREATE TABLE test1 (a char(5));
CREATE TABLE
test=*# copy test1 from stdin;
Enter data to be copied followed by a newline.
End with a backslash and a period on a line by itself.
>> aaa
>> bbb
>> test
>> foo
>> bar
>> \.
test=*# select count(1) from test1 where substring(a,2,1) = 'b';
count
-------
1
(1 row)
test=*# select count(1) from test1 where substring(a,2,1) != 'b';
count
-------
4
(1 row)
HTH, Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
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