8.10. 位元字串型別

bittype data must match the lengthnexactly; it is an error to attempt to store shorter or longer bit strings.bit varyingdata is of variable length up to the maximum lengthn; longer strings will be rejected. Writingbitwithout a length is equivalent tobit(1), whilebit varyingwithout a length specification means unlimited length.

Refer toSection 4.1.2.5for information about the syntax of bit string constants. Bit-logical operators and string manipulation functions are available; see.

A bit string value requires 1 byte for each group of 8 bits, plus 5 or 8 bytes overhead depending on the length of the string (but long values may be compressed or moved out-of-line, as explained inSection 8.3for character strings).