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Which character function can be used to return a specified portion of a character string?

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Which character function can be used to return a specified portion of a character string? (a) INSTR (b) SUBSTRING (c) SUBSTR (d) POS I had been asked this question during an interview for a job. Enquiry is from A Simple Transaction Model topic in chapter Transactions of Database Management

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Correct choice is (c) SUBSTR Best explanation: SUBSTR are used to match the particular characters in a string.

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