A SELECT statement can be used to perform these three functions: 1. Choose rows from a table. 2. Choose columns from a table 3. Bring together data that is stored in different tables by creating a link between them. Which set of keywords describes these capabilities? （） difference, projection, join。 selection, projection, join。 selection, intersection, join。 intersection, projection, join。 difference, projection, product。
事故处理应严格按照“事故原因没查清不放过、责任人员没受到处理不放过.整改措施没落实不放过.（）”的原则。 有关单位没罚款不放过。 有关人员没罚款不放过。 事故过程没通报不放过。 有关人员没受到教育不放过。
Which statement is true about the plan being loaded into the SQL baseline by the above command?（） It is loaded with the FIXED status.。 It is loaded with the ACCEPTED status.。 It is not loaded with the ENABLED status.。 It is not loaded with the ACCEPTED status.。
多层小砌块房屋6度以下地震设防时的芯柱竖向插筋不应小于（），并贯通墙身与圈梁连接。 1φ12。 1φ14。 2φ12。 2φ14。
You are working in a dedicated server environment. Your database is running in the automatic Program Global Area （PGA） memory management mode. Which two statements are correct in this scenario？（） The WORK_AREASIZE_POLICY initialization parameter cannot be set to AUTO.。 The Oracle database automatically controls the amount of PGA memory allotted to SQL work areas.。 Setting the value of the SGA_TARGET initialization parameter to 0 will disable the automatic PGA memory management.。 The SORT_AREA_SIZE parameter is ignored by all the sessions running in the automatic PGA memory management mode.。
在OOA模型中，每个对象或分类结构要考虑的3类基础服务是（）
