This section describes functions and operators for examining and
manipulating values of type bytea
.
SQL defines some string functions that use key words, rather than commas, to separate arguments. Details are in Table 9.11. PostgreSQL also provides versions of these functions that use the regular function invocation syntax (see Table 9.12).
The sample results shown on this page assume that the server parameter
bytea_output
is set
to escape
(the traditional PostgreSQL format).
Table 9.11. SQL Binary String Functions and Operators
Additional binary string manipulation functions are available and are listed in Table 9.12. Some of them are used internally to implement the SQL-standard string functions listed in Table 9.11.
Table 9.12. Other Binary String Functions
get_byte
and set_byte
number the first byte
of a binary string as byte 0.
get_bit
and set_bit
number bits from the
right within each byte; for example bit 0 is the least significant bit of
the first byte, and bit 15 is the most significant bit of the second byte.
See also the aggregate function string_agg
in
Section 9.20 and the large object functions
in Section 34.4.