This section describes functions and operators for examining and
    manipulating bit strings, that is values of the types
    bit and bit varying.  Aside from the
    usual comparison operators, the operators
    shown in Table 9.14 can be used.
    Bit string operands of &, |,
    and # must be of equal length.  When bit
    shifting, the original length of the string is preserved, as shown
    in the examples.
   
Table 9.14. Bit String Operators
| Operator | Description | Example | Result | 
|---|---|---|---|
| || | concatenation | B'10001' || B'011' | 10001011 | 
| & | bitwise AND | B'10001' & B'01101' | 00001 | 
| | | bitwise OR | B'10001' | B'01101' | 11101 | 
| # | bitwise XOR | B'10001' # B'01101' | 11100 | 
| ~ | bitwise NOT | ~ B'10001' | 01110 | 
| << | bitwise shift left | B'10001' << 3 | 01000 | 
| >> | bitwise shift right | B'10001' >> 2 | 00100 | 
    The following SQL-standard functions work on bit
    strings as well as character strings:
    lengthbit_lengthoctet_lengthpositionsubstringoverlay
    The following functions work on bit strings as well as binary
    strings:
    get_bitset_bit
    In addition, it is possible to cast integral values to and from type
    bit.
    Some examples:
44::bit(10) 0000101100 44::bit(3) 100 cast(-44 as bit(12)) 111111010100 '1110'::bit(4)::integer 14
    Note that casting to just “bit” means casting to
    bit(1), and so will deliver only the least significant
    bit of the integer.
   
      Casting an integer to bit(n) copies the rightmost
      n bits.  Casting an integer to a bit string width wider
      than the integer itself will sign-extend on the left.