8.11.6 BITXOR

(1) Specification format

scalar-function-BITXOR ::= BITXOR(target-data-1,target-data-2)
 
  target-data-1 ::= value-expression
  target-data-2 ::= value-expression

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(2) Explanation of specification format

target-data-1 and target-data-2:

Specifies the target binary data.

The following rules apply:

• Specify target-data-1 and target-data-2 in the form of value expressions. For details about value expressions, see 7.20 Value expression.

• Specify BINARY or VARBINARY type data for target-data-1 and target-data-2.

• Make sure that target-data-1 and target-data-2 have the same data length (if the target data is BINARY type), or actual length (if the target data is VARBINARY type).

• You cannot specify a dynamic parameter by itself for target-data-1.

• If you specify a dynamic parameter by itself for target-data-2, the data type and data length of target-data-1 are assumed for the data type and data length of the dynamic parameter.

The following example illustrates the result of executing the scalar function BITXOR.

Examples:

Return the bitwise exclusive OR of two binary data items.

BITXOR(B'01011011',B'01001110') → B'00010101'

BITXOR(B'01011011',X'FF') → B'10100100'

BITXOR(X'0F',X'FF') → X'F0'

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(3) Rules

1. The execution result of the scalar function BITXOR (value of the nth bit) is shown in the following table.

   Table 8‒42: Execution result of the scalar function BITXOR (value of the nth bit)

   Value of the nth bit of target-data-1	Value of the nth bit of target-data-2	Execution result of the scalar function BITXOR (value of the nth bit)
   0	0	0
   	1	1
   1	0	1
   	1	0

2. The data type and data length of the execution result are determined by the data types and data lengths of target-data-1 and target-data-2. The data type and data length of the execution result of the scalar function BITXOR are shown in the following table.

   Table 8‒43: Data type and data length of the execution result of the scalar function BITXOR

   Data type and data length of target-data-1	Data type and data length of target-data-2	Data type and data length of the execution result
   BINARY(m)	BINARY(m)	BINARY(m)
   	VARBINARY(Y) Actual length of target data: m	VARBINARY(Y) Actual length of target data: m
   VARBINARY(X) Actual length of target data: m	BINARY(m)	VARBINARY(X) Actual length of target data: m
   	VARBINARY(Y) Actual length of target data: m	VARBINARY(MAX(X,Y)) Actual length of target data: m

   Legend:

   m: Data length or actual length

   X: Data length (when X ≥ m)

   Y: Data length (when Y ≥ m)

3. The NOT NULL constraint does not apply to the value of the execution result (the null value is allowed).

4. If either target-data-1 or target-data-2 has a null value, the execution result will be a null value.

5. If the actual length of target-data-1 and target-data-2 is 0 bytes, the execution result will be binary data whose actual length is 0 bytes.

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