SQL query problem

[Marek Lewczuk]

Hello,
I'm in the middle of the migration process from MySQL to PostgreSQL and
I cannot understand why this query isn't working (in MySQL it's working
fine). PG returns: ERROR: Relation "_con" does not exist

This is my query:

SELECT
_CON.con_id,
_MOD.mod_ty,
_VER.version,
_YEA.year,
_CON.dri_id,
_CON.man_cod,
_ENG.eng_pow
FROM
db_data.mda_mod _MOD,
db_data.mda_mod _con _CON,
db_data.mda_mak _eng _ENG,
db_data.set_mda _fue _FUE
LEFT JOIN db_data.mda_mod _ver _VER ON _VER.ver_id = _CON.ver_id
LEFT JOIN db_data.mda_mod _yea _YEA ON _YEA.yea_id = _CON.yea_id
WHERE
_MOD.mod_id = '283' AND
_CON.mod_id = _MOD.mod_id AND
_CON.psd <= NOW() AND
_CON.ped > NOW() AND
_ENG.eng_id = _CON.eng_id AND
_ENG.eng_fue = _FUE.fue_id
I will be appreciated for you help.

ML


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[Bruno Wolff III]

On Thu, Oct 09, 2003 at 20:52:58 +0100,
Marek Lewczuk <ne***@lewczuk. com> wrote:

Hello,
I'm in the middle of the migration process from MySQL to PostgreSQL and
I cannot understand why this query isn't working (in MySQL it's working
fine). PG returns: ERROR: Relation "_con" does not exist
Probably you quoted the table name when you created it so that it is named
_CON. However when you don't quote the name in later references _CON
is converted to _con which is a different name that doesn't match any
existing table.

This behavior is contrary to the spec (lowercasing instead of uppercasing),
but isn't going to change since uppercase names look ugly.

A good general rule to follow is to either never quote names or always
quote names.

This is my query:

SELECT
_CON.con_id,
_MOD.mod_ty,
_VER.version,
_YEA.year,
_CON.dri_id,
_CON.man_cod,
_ENG.eng_pow
FROM
db_data.mda_mod _MOD,
db_data.mda_mod _con _CON,
db_data.mda_mak _eng _ENG,
db_data.set_mda _fue _FUE
LEFT JOIN db_data.mda_mod _ver _VER ON _VER.ver_id = _CON.ver_id
LEFT JOIN db_data.mda_mod _yea _YEA ON _YEA.yea_id = _CON.yea_id
WHERE
_MOD.mod_id = '283' AND
_CON.mod_id = _MOD.mod_id AND
_CON.psd <= NOW() AND
_CON.ped > NOW() AND
_ENG.eng_id = _CON.eng_id AND
_ENG.eng_fue = _FUE.fue_id
I will be appreciated for you help.

ML


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[Karsten Hilbert]

> fine). PG returns: ERROR: Relation "_con" does not exist

This is my query:

SELECT
_CON.con_id,

Please make sure you get the quoting right regarding table
names. PostgreSQL will fold _CON into _con unless quoted
"_CON". So, it may be that you created the table with quotes
("_CON"). Now, in your query you don't use quotes and thusly
it is looking for a _con table. The simple rule of thumb is to
either always or never use quotes.

HTH,
Karsten
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GPG key ID E4071346 @ wwwkeys.pgp.net
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