What recommendations does the SQL Access Advisor provide for optimizing SQL queries？（） selection of SQL plan baselines。 partitioning of tables and indexes。 creation of index-organized tables。 creation of bitmap， function-based，and B-tree indexes。 optimization of materialized views for maximum query usage and fast refresh。
单相异步电动机启动一般有电阻分相启动、电容分相启动和（）。 单相启动。 单三相启动。 多极启动。 罩极启动。
The EMP table has some discrepancy in data entry with a particular employee ID. You execute the query as shown in the Exhibit to retrieve all versions of the row that exist between two SCNs.View the Exhibit. Which two statements about the results of the query shown in the Exhibit are correct? （）(Choose two.) The LAST_SCN value in the first row is NULL, which means that the versions of the row still exist at SCN 6636300.。 The LAST_SCN value in the second row in NULL, which means that the version of the row still exists at SCN 6636300.。 The LAST_SCN value in the third row is 6636280, which means that the version of row exists above SCN 6636280.。 The LAST_SCN value in the second row is NULL, which means that the version of the row no longer exists because it was deleted.。
Give; What is the result?（） b3。 b8。 b13。 f3。 f8。 f13。 Compilation fails.。 An exception is thrown at runtime.。
以下问句中哪些是错误的？（） 油比重较大时粘度大，流动点为-3至+3℃左右。 天燃气含甲烷在70%以上。 油层水和采水井中采上来的地下水相比较氯根要低。
为有利于石灰土强度的形成，用作路面基层的石灰土应在冰冻前（）完工。
