单项选择题 You have two tables with referential integrity enforced between them. You need to insert data to  thechild table first because it is going to be a long transaction and data for the parent table will be available ina later stage， which can be inserted as part of the same transaction. View the Exhibit to examine the commands used to create tables. Which action would you take to delay the referential integrity checking until the end of the transaction（）

多项选择题 You execute this command to drop the ITEM table， which has the primary key referred in the ORDERtable：  SQL> DROP TABLE scott.item CASCADE CONSTRAINTS PURGE；  Which two statements are true about the effect of the command（）

多项选择题 WhichthreedescriptionsarecorrectabouttheeffectsoftheTRUNCATEcommandonatable（）