多项选择题
Which two are true about aggregate functions?（）
A. You can use aggregate functions in any clause of a SELECT statement.
B. You can use aggregate functions only in the column list of the SELECT clause and in the WHERE clause of a SELECT statement.
C. You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.
D. You can pass column names, expressions, constants, or functions as parameters to an aggregate function.
E. You can use aggregate functions on a table, only by grouping the whole table as one single group.
F. You cannot group the rows of a table by more than one column while using aggregate functions.
相关考题
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多项选择题
Which two are attributes of iSQL*Plus? （）
A./SQL*Plus commands cannot be abbreviated.
B./SQL*Plus commands are accessed from a browser.
C./SQL*Plus commands are used to manipulate data in tables.
D./SQL*Plus commands manipulate table definitions in the database.
E./SQL*Plus is the Oracle proprietary interface for executing SQL statements. -
单项选择题
Examine the structure if the EMPLOYEES and NEW EMPLOYEES tables: Which MERGE statement is valid?（）
A.
B.
C.
D.
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单项选择题
Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE You issue these statements: CREATE table new_emp ( employe_id NUMBER, name VARCGAR2(30)); INSERT INTO new_emp SELECT employee_id, last_name from employees; Savepoint s1; UPDATE new_emp set name = UPPER(name); Savepoint s2; Delete from new_emp; Rollback to s2; Delete from new_emp where employee_id=180; UPDATE new_emp set name = James; Rollback to s2; UPDATE new_emp sey name = James Where employee_id=180; Rollback; At the end of this transaction, what is true?（）
A. You have no rows in the table.
B. You have an employee with the name of James.
C. You cannot roll back to the same savepoint more than once.
D. Your last update fails to update any rows because employee ID 180 was already deleted.
