Which symbol is used in standard sql as a wildcard to represent a series of one or more unspecified characters? % (percent sign) ; (semi-colon) _ (underscore) ! (exclamation mark) ? (question mark)

% (percent sign)

Explanation:

% (percent sign) in SQL is used to represent any number of unspecified characters. For example, Ex% will match Example, Expensive, Exclaim, etc

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