• Q2查询改写

    Q2 is the rewritten table name by the query rewrite.

    youdao

  • 注意查询10获得,这是因为SQLgroupby函数null生成我们示例员工没有办公室信息

    Note that we get an extra row from Query 10, because SQL's group by also produces a group for NULL values, and there is one employee in our sample table with no office information.

    youdao

  • 注意查询10获得,这是因为SQLgroupby函数null生成我们示例员工没有办公室信息

    Note that we get an extra row from Query 10, because SQL's group by also produces a group for NULL values, and there is one employee in our sample table with no office information.

    youdao

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