length limitation in '=' operator when comparing TEXT fields ?

Hi,

i have a little problem when selecting entries from a table, specified by a
 long match on a field of type TEXT. Is there a length limitation for the '='
operator when comparing a field of type TEXT to a given string ?

Example:

SELECT description FROM sequences_33 WHERE description LIKE 'gi 17559974%';

Result:

 gi 17559974 ref NP_506864.1  (NM_074463) acid phosphatase [Caenorhabditis
elega
ns] gi 7499536 pir  T21181 hypothetical protein F21A3.2 - Caenorhabditis
elegans
 gi 3876155 emb CAB04153.1  (Z81509) predicted using Genefinder Similarity to
As
pergillus acid phosphatase (TR:Q12546) cDNA EST yk3g4.5 comes from this gene
cDN
A EST yk69f10.5 comes from this gene cDNA EST yk231b3.5 comes from this gene
cDN
A EST yk285e4.5 comes from this gene cDN
(1 row)


Thats ok. And now:

SELECT description FROM sequences_33 WHERE description=' gi 17559974 ref
NP_506864.1  (NM_074463) acid phosphatase [Caenorhabditis elega
ns] gi 7499536 pir  T21181 hypothetical protein F21A3.2 - Caenorhabditis
elegans
 gi 3876155 emb CAB04153.1  (Z81509) predicted using Genefinder Similarity to
As
pergillus acid phosphatase (TR:Q12546) cDNA EST yk3g4.5 comes from this gene
cDN
A EST yk69f10.5 comes from this gene cDNA EST yk231b3.5 comes from this gene
cDN
A EST yk285e4.5 comes from this gene cDN'
(0 row)

The two strings are identical and there are no confusing characters in them.

Any idea ?

PS: The type of field description is TEXT

Thanx in advance

Michael

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