Обсуждение: SQL INSERT bug with 6.5.3 and 7.0.2

We're experiencing a problem with the parser with both 6.5.3 and 7.0.2.

The following is with 7.0.2.  6.5.3 is similar.

umpire(rc3.d)% psql -u fmfts
psql: Warning: The -u option is deprecated. Use -U.
...
fmfts=# CREATE TABLE "contact_people" (
fmfts(#    "user_id" character(30),
fmfts(#   "account_id" character(30),
fmfts(#     "exchange_id" character(30),
fmfts(#    "isin_code" character(30),
fmfts(#    "symbol" character(30),
fmfts(#    "name" character(30),
fmfts(#    "position" character(30),
fmfts(#      "email_address" character(30));
CREATE
fmfts=# insert into contact_people (user_id,name,position,email_address) values ('jgotts','hello',null,null);
ERROR:  parser: parse error at or near "position"
fmfts=# insert into contact_people (user_id,name,"position",email_address) values ('jgotts','hello',null,null);
INSERT 20402 1

The problem also appears with libpq.

Any idea why this would occur?

John

--
John GOTTS <jgotts@linuxsavvy.com>  http://www.linuxsavvy.com/staff/jgotts

In message <Pine.LNX.4.20.0006251829460.6484-100000@tacdyn.com>, "Robert J. Spr
awls" writes:

>On Sun, 25 Jun 2000, John Gotts wrote:

>JG>We're experiencing a problem with the parser with both 6.5.3 and 7.0.2.

>JG>The following is with 7.0.2.  6.5.3 is similar.

>JG>umpire(rc3.d)% psql -u fmfts
>JG>psql: Warning: The -u option is deprecated. Use -U.
>JG>...
>JG>fmfts=# CREATE TABLE "contact_people" (
>JG>fmfts(#    "user_id" character(30),
>JG>fmfts(#   "account_id" character(30),
>JG>fmfts(#     "exchange_id" character(30),
>JG>fmfts(#    "isin_code" character(30),
>JG>fmfts(#    "symbol" character(30),
>JG>fmfts(#    "name" character(30),
>JG>fmfts(#    "position" character(30),
>JG>fmfts(#      "email_address" character(30));

>Why are you enclosing the field names in quotes? That isn't neccessary.

This is just a cut from pg_dump and a paste into psql of the exact SQL
statement.  I doubt pg_dump would get this wrong.

My understanding is that quote characters allow you to have fields with capital
letters and spaces, but using them unnecessarily is harmless.

>JG>fmfts=# insert into contact_people (user_id,name,position,email_address) va
>lues ('jgotts','hello',null,null);
>JG>ERROR:  parser: parse error at or near "position"
>JG>fmfts=# insert into contact_people (user_id,name,"position",email_address)
>values ('jgotts','hello',null,null);
>JG>INSERT 20402 1

>JG>The problem also appears with libpq.

>JG>Any idea why this would occur?

>It could be fallout from enclosing the field names in quotes, but why it
>doesn't fail on all of them I don't know. Try without the quotes in the
>table definition.

fmfts=# CREATE TABLE contact_people (user_id character(30), account_id character(30), exchange_id character(30),
isin_codecharacter(30), symbol character(30), name character(30), position character(30), email_address character(30));

ERROR:  parser: parse error at or near "position"

The plot thickens...

This is looking more and more like a bug in PostgreSQL's SQL parser.

John

--
John GOTTS <jgotts@linuxsavvy.com>  http://www.linuxsavvy.com/staff/jgotts

John Gotts wrote:
  >We're experiencing a problem with the parser with both 6.5.3 and 7.0.2.

  >ERROR:  parser: parse error at or near "position"
  >fmfts=# insert into contact_people (user_id,name,"position",email_address) v
      >alues ('jgotts','hello',null,null);
  >INSERT 20402 1
  >
  >The problem also appears with libpq.
  >
  >Any idea why this would occur?

POSITION is a SQL reserved word.

e.g.:
SELECT POSITION ('bc' IN 'abcd');
 strpos
--------
      2
(1 row)


--
Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
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GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839  932A 614D 4C34 3E1D 0C1C
                 ========================================
     "Honour thy father and mother; which is the first
      commandment with promise; That it may be well with
      thee, and thou mayest live long on the earth."
                          Ephesians 6:2,3

In message <200006252355.e5PNtKe18458@linda.lfix.co.uk>, "Oliver Elphick" write
s:

>John Gotts wrote:
>  >We're experiencing a problem with the parser with both 6.5.3 and 7.0.2.

>  >ERROR:  parser: parse error at or near "position"
>  >fmfts=# insert into contact_people (user_id,name,"position",email_address)
>v
>      >alues ('jgotts','hello',null,null);
>  >INSERT 20402 1
>  >
>  >The problem also appears with libpq.
>  >
>  >Any idea why this would occur?

>POSITION is a SQL reserved word.

>e.g.:
>SELECT POSITION ('bc' IN 'abcd');
> strpos
>--------
>      2
>(1 row)

Shouldn't the parser then also reject "position"?

John

--
John GOTTS <jgotts@linuxsavvy.com>  http://www.linuxsavvy.com/staff/jgotts

John Gotts <jgotts@ww2.tqstats.com> writes:
> fmfts=# insert into contact_people (user_id,name,position,email_address) values ('jgotts','hello',null,null);
> ERROR:  parser: parse error at or near "position"
> fmfts=# insert into contact_people (user_id,name,"position",email_address) values ('jgotts','hello',null,null);
> INSERT 20402 1

POSITION is an SQL reserved word.  If you want to use it as a column
name, you can, but you'll have to double-quote it every time you use it.

            regards, tom lane

> >POSITION is a SQL reserved word.
> Shouldn't the parser then also reject "position"?

No (if I read the question correctly), since double-quoted identifiers
do not conflict with reserved words. But then, as Tom pointed out, you
will have to use the double-quotes just about everywhere.

                 - Thomas