Of course, you can write more selective SQL queries that incorporate relational projection and restriction operations.
当然也可以编写更具选择性的SQL查询，使之包含关系投影和限制操作。
Of course, you can write more selective SQL queries that incorporate relational projection and restriction operations.
当然也可以编写更具选择性的SQL查询，使之包含关系投影和限制操作。
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