Syntax:
|

Bitwise OR.

The result type depends on whether the arguments are evaluated as
binary strings or numbers:

o Binary-string evaluation occurs when the arguments have a binary
  string type, and at least one of them is not a hexadecimal literal,
  bit literal, or NULL literal. Numeric evaluation occurs otherwise,
  with argument conversion to unsigned 64-bit integers as necessary.

o Binary-string evaluation produces a binary string of the same length
  as the arguments. If the arguments have unequal lengths, an
  ER_INVALID_BITWISE_OPERANDS_SIZE
  (https://dev.mysql.com/doc/mysql-errors/8.0/en/server-error-reference
  .html#error_er_invalid_bitwise_operands_size) error occurs. Numeric
  evaluation produces an unsigned 64-bit integer.

For more information, see the introductory discussion in this section.

URL: https://dev.mysql.com/doc/refman/8.0/en/bit-functions.html

