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What does ‘abc’ || ‘xyz’, when PIPES_AS_CONCAT is enabled, result in?

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What does ‘abc’ || ‘xyz’, when PIPES_AS_CONCAT is enabled, result in?

(a) 0

(b) 1

(c) abcxyz

(d) xyzabc

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My doubt is from External Security: Preventing Unauthorized Network Access in division Access Control and Security of MySQL

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The correct answer is (c) abcxyz

Explanation: If the SQL mode PIPES_AS_CONCAT has been enabled, the SQL standard ‘||’ operation for string concatenation becomes valid in MySQL. Both operands are concatenated to give ‘abcxyz’.

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