〈select name=*〉…〈/select〉标记的作用是( )。
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Evaluate these two SQL statements: SELECT last_name, salary , hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them? ()
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Evaluate this SQL statement: SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME FROM EMP e, DEPARTMENT d WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID; In the statement, which capabilities of a SELECT statement are performed?()
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Given the following query:SELECT last_name, first_name, age, hire_date FROM employee WHERE age > 40Which of the following clauses must be added to return the rows sorted by AGE, oldest first, and by LAST_NAME, from A to Z?()
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Evaluate the following command and its output: SQL>SELECT * FROM dba_temp_free_space; TABLESPACE_NAME TABLESPACE_SIZE ALLOCATED_SPACE FREE_SPACE LMTEMP 250609664 101048576 149561088 Which two statements correctly interpret the output?()
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Examine the following output: SQL> SELECT index_name,status FROM dba_indexes WHERE status=’UNUSABLE’; INDEX_NAME STATUS------------------------------ ----------- EIND UNUSABLE Which two statements about the above index are true()
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执行如下两个查询,结果为() Select ename name,sal salary from emp order by salary Select ename name,sal“salary”from emp order by sal asc
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Evaluate this SQL statement: SELECT e.emp_name, d.dept_name FROM employees e JOIN departments d USING (department_id) WHERE d.department_id NOT IN (10,40) ORSER BY dept_name; The statement fails when executed. Which change fixes the error?()
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Evaluate this SQL statement: SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME FROM EMPLOYEES e, DEPARTMENTS d WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID; In the statement, which capabilities of a SELECT statement are performed?()
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Select emp_id,emp_name,sex,title,wage from employee order by emp_name句子得到的结果集是按()排序。
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The PRODUCTS table has these columns: PRODUCT_ID NUMBER(4) PRODUCT_NAME VARCHAR2(45) PRICE NUMBER(8,2) Evaluate this SQL statement: SELECT * FROM PRODUCTS ORDER BY price, product _ name; What is true about the SQL statement? ()
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You executed the following query: SELECT operation, undo_sql, table_name FROM flashback_transaction_query; Which statement is correct regarding the query output?()
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You executed the following query: SELECT operation, undo_sql, table_name FROM flashback_transaction_query; Which statement is correct regarding the query output?()
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You executed the following query: SELECT operation, undo_sql, table_name FROM flashback_transaction_query; Which statement is correct regarding the query output?()
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HTML 代码 <select> </select> 的作用是什么?( )
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语句SELECT name,sex,birthday FROM human返回()列。
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BookStore数据库中有客户表Customer(CustomerCode, Name, Sex, Hometown, Email, Telephone, LoginDate, Password)查询Customer表中所有客户的信息,要求显示CustomerCode、Name、Hometown和Telephone字段信息。SQL语句:SELECT _________ FROM Customer
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When booking a flight, you can use your another name, which is different from the name on your selected ID.
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查询结果集ResultSet对象是以统一的行列形式组织数据的,执行ResultSet rs = stmt.executeQuery ('select bid,name,author,publish,price from book');语句,得到的结果集rs的列数为( )
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对于基本表S(S,Name,Sex,Birthday)和SC(S,C,Grade),其中S、Name、Sex、Birthday、C和G rade分别表示学号、姓名、性别、生日、课程号和成绩。与下列SQL语句等价的关系代数式是______。 SELECT S,Name FROM S WHERE S NOT IN (SELECT S FROM SC WHERE C='c102')。
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在SQL语言中,一个SELECT-FROM-WHERE语句称为一个()。将一个SELECT查询块嵌入另一个SELECT查询
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SELECT cust_name FROM Customers WHERE cust_name IN ('IL','IN','MI')的输出可以是如下选项中的哪些()?
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【判断题】BookStore数据库中有图书表 Book(BookCode, BookName, Author, PublisherCode, PublishTime,BookSort, ISBN, BookPicture, ContentInro, Price, Discount) 查询图书名称(BookName)含有“程序”的图书信息。SQL语句: SELECT BookCode,BookName,Author,Price,Discount FROM Book WHERE Name=“%程序%”
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查询:对于大学中所有讲授过课程的教师,找出他们的姓名及其所讲授课程的ID。 该查询可以写成: select name, course id from instructor natural join teaches;
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将各个系教师的平均工资定义为视图average_salary. create view average_salary as select dept_name,max(salary) from instructor; group by dept_name;
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