SQL sentences are the key part of database application, and SQL optimization is very important in improving the responding speed and decreasing the inquiry time.
SQL语句是数据库应用中一个非常关键的部分，SQL优化对提高数据库的响应速度、减少查询时间具有重要的作用。
SQL sentences are the key part of database application, and SQL optimization is very important in improving the responding speed and decreasing the inquiry time.
SQL语句是数据库应用中一个非常关键的部分，SQL优化对提高数据库的响应速度、减少查询时间具有重要的作用。
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