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If only one operand expression is of type String, then string conversion
is performed on the other operand to produce a string at run time. The
result is a reference to a String object (newly created, unless the
expression is a compile-time constant expression (§15.28))that is the
concatenation of the two operand strings. The characters of the left-hand
operand precede the characters of the right-hand operand in the newly
created string. If an operand of type String is null, then the string
"null" is used instead of that operand. "null" is used instead of that
operand.
Concatenates two or more character or binary strings, columns, or a
combination of strings and column names into one expression (a string
operator).
Parameters:
operand1 - the left expression
Parameters:
operand2 - the right expression The Expression for concatenation |