6.11. Binary Functions and Operators

Binary Operators

The || operator performs concatenation.

Binary Functions

length(binary) → bigint

Returns the length of binary in bytes.
concat(binary1, …, binaryN) → varbinary

Returns the concatenation of binary1, binary2, …, binaryN.This function provides the same functionality as theSQL-standard concatenation operator (||).
tobase64(_binary) → varchar

Encodes binary into a base64 string representation.
frombase64(_string) → varbinary

Decodes binary data from the base64 encoded string.
tobase64url(_binary) → varchar

Encodes binary into a base64 string representation using the URL safe alphabet.
frombase64url(_string) → varbinary

Decodes binary data from the base64 encoded string using the URL safe alphabet.
tohex(_binary) → varchar

Encodes binary into a hex string representation.
fromhex(_string) → varbinary

Decodes binary data from the hex encoded string.
tobig_endian_64(_bigint) → varbinary

Encodes bigint in a 64-bit 2’s complement big endian format.
frombig_endian_64(_binary) → bigint

Decodes bigint value from a 64-bit 2’s complement big endian binary.
tobig_endian_32(_integer) → varbinary

Encodes integer in a 32-bit 2’s complement big endian format.
frombig_endian_32(_binary) → integer

Decodes integer value from a 32-bit 2’s complement big endian binary.
toieee754_32(_real) → varbinary

Encodes real in a 32-bit big-endian binary according to IEEE 754 single-precision floating-point format.
fromieee754_32(_binary) → real

Decodes the 32-bit big-endian binary in IEEE 754 single-precision floating-point format.
toieee754_64(_double) → varbinary

Encodes double in a 64-bit big-endian binary according to IEEE 754 double-precision floating-point format.
fromieee754_64(_binary) → double

Decodes the 64-bit big-endian binary in IEEE 754 double-precision floating-point format.
lpad(binary, size, padbinary) → varbinary

Left pads binary to size bytes with padbinary.If size is less than the length of binary, the result istruncated to size characters. size must not be negativeand padbinary must be non-empty.
rpad(binary, size, padbinary) → varbinary

Right pads binary to size bytes with padbinary.If size is less than the length of binary, the result istruncated to size characters. size must not be negativeand padbinary must be non-empty.
crc32(binary) → bigint

Computes the CRC-32 of binary. For general purpose hashing, usexxhash64(), as it is much faster and produces a better quality hash.
md5(binary) → varbinary

Computes the md5 hash of binary.
sha1(binary) → varbinary

Computes the sha1 hash of binary.
sha256(binary) → varbinary

Computes the sha256 hash of binary.
sha512(binary) → varbinary

Computes the sha512 hash of binary.
xxhash64(binary) → varbinary

Computes the xxhash64 hash of binary.
hmacmd5(_binary, key) → varbinary

Computes HMAC with md5 of binary with the given key.
hmacsha1(_binary, key) → varbinary

Computes HMAC with sha1 of binary with the given key.
hmacsha256(_binary, key) → varbinary

Computes HMAC with sha256 of binary with the given key.
hmacsha512(_binary, key) → varbinary

Computes HMAC with sha512 of binary with the given key.

原文: https://prestodb.io/docs/current/functions/binary.html