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The default level of consistency in SQL is

  • A.repeatable read

  • B.read committed

  • C.read uncommitted

  • D.serializable

Answer: D

Correct answer: serializable

The SQL standard's default isolation level is serializable, the strictest, in which concurrent execution must be equivalent to running the transactions one after another. Individual products often default to something weaker for performance, but the standard's default is this.

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