Question

The _ character is used for concatenation of strings

Answer 1

Answer:

Concatenation Operator

Operator Purpose Example

|| Concatenates character strings and CLOB data. SELECT 'Name is ' || last_name FROM employees;

Answer 2

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..

The + (plus) operator is often overloaded to denote concatenation for string arguments: "Hello, " + "World" has the value "Hello, World" . In other languages there is a separate operator, particularly to specify implicit type conversion to string, as opposed to more complicated behavior for generic plus.