seiliki@so-net.net.tw writes:
> Data type of table1.c1 is bytea. That column stores binary data. The following matchings do not work. What is the
rightsyntax?
> TIA
> CN
> ---------------
> select c1 ~ E'\000' from table1;
> select c1 LIKE E'%\000%' from table1;
> ERROR: invalid byte sequence for encoding "UTF8": 0x00
The reason that doesn't work is that E'\000' is initially a text
literal, with the backslash sequence being processed by the string
literal parser; and a zero byte isn't allowed in text.
Try it with E'\\000'. What this gives rise to is a text constant
containing the four characters \ 0 0 0, and then when that gets
converted to bytea, another round of backslash processing will happen
to produce the (legal) bytea constant with a single zero byte.
regards, tom lane
