Read committed -- The transaction can read data committed by other transactions.
Read committed（读已提交） ——事务可以读取由另一事务提交的数据。
Read-Committed is the minimum level required for optimistic locking to work.
Read-Committed是乐观锁工作所需的最低级别。
Read committed, Read uncommitted, Repeatable Read, Serializable.
提交读，未提交读，可重复读，可串行读。
Read committed, Read uncommitted, Repeatable Read, Serializable.
提交读，未提交读，可重复读，可串行读。
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