問題文
An analyst reads the usage tracking table that logs logical queries and finds that the column holding the count of returned rows is still empty for a query that brought back a great deal of data. The analyst also finds one column holding None where another holds nothing at all. What does the documentation say about these two observations?
選択肢
- The column counting returned rows is filled in as soon as the database hands the rows over, and the column naming an impersonated user carries None where the column naming the catalog carries nothing.
- The column counting returned rows is filled in as soon as the database hands the rows over, and the column naming the catalog carries None where the column naming an impersonated user holds nothing.
- The column counting returned rows stays empty until the analyst has displayed the whole of that data, and the column naming the catalog carries None where the column naming an impersonated user holds nothing.
- The column counting returned rows stays empty until the analyst has displayed the whole of that data, and the column naming an impersonated user carries None where the column naming the catalog carries nothing.