[求面试双语幼儿园的英文自我介绍]Good morning, my name is ———, You can call me ——(英文名) if you like.It is really a great honor to have this opportunity for a interview ,I would like to answ...+阅读
What are two methods of retrieving SQL? What cursor type do you use to retrieve multiple recordsets? What is the difference between a “where” clause and a “having” clause? - “Where” is a kind of restiriction statement. You use where clause to restrict all the data from DB.Where clause is using before result retrieving. But Having clause is using after retrieving the data.Having clause is a kind of filtering command. What is the basic form of a SQL statement to read data out of a table? The basic form to read data out of table is 'SELECT * FROM table_name; ' An answer: 'SELECT * FROM table_name WHERE xyz= 'whatever';' cannot be called basic form because of WHERE clause. What structure can you implement for the database to speed up table reads? - Follow the rules of DB tuning we have to: 1] properly use indexes ( different types of indexes) 2] properly locate different DB objects across different tablespaces, files and so on.3] create a special space (tablespace) to locate some of the data with special datatype ( for example CLOB, LOB and …) What are the tradeoffs with having indexes? - 1. Faster selects, slower updates. 2. Extra storage space to store indexes. Updates are slower because in addition to updating the table you have to update the index.
为管理业务培训信息,建立3个表: S(S#,SN,SD,SA)S#,SN,SD,SA分别代表学号,学员姓名,所属单位,学员年龄 C(C#,CN)C#,CN分别代表课程编号,课程名称 SC(S#,C#,G) S#,C#,G分别代表学号,所选的课程编号,学习成绩
(1)使用标准SQL嵌套语句查询选修课程名称为'税收基础'的学员学号和姓名? 答案:select s# ,sn from s where S# in(select S# from c,sc where c.c#=sc.c# and)
(2) 使用标准SQL嵌套语句查询选修课程编号为'C2'的学员姓名和所属单位? 答:select sn,sd from s,sc where s.s#=sc.s# and sc.c#='c2' (3) 使用标准SQL嵌套语句查询不选修课程编号为'C5'的学员姓名和所属单位? 答:select sn,sd from s where s# not in(select s# from sc where c#='c5') (4)查询选修了课程的学员人数 答:select 学员人数=count(distinct s#) from sc (5) 查询选修课程超过5门的学员学号和所属单位? 答:select sn,sd from s where s# in(select s# from sc group by s# having count(distinct c#)>5)
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