单项选择题
A. Removes the table B. Removes all rows from a table C. Shortens the table to 10 rows D. Removes all columns from a table E. Removes foreign keys from a table
Which is an /SQL*Plus command? （）A. INSERTB. UPDATEC. S...
单项选择题Which is an /SQL*Plus command? （）
A. INSERT B. UPDATE C. SELECT D. DESCRIBE E. DELETE F. RENAME
Which SELECT statement should you use to extract the ye...
单项选择题Which SELECT statement should you use to extract the year from the system date and display it in the format "1998"? （）
A. SELECT TO_CHAR(SYSDATE,'yyyy') FROM dual; B. SELECT TO_DATE(SYSDATE,'yyyy') FROM dual; C. SELECT DECODE(SUBSTR(SYSDATE, 8), 'YYYY') FROM dual; D. SELECT DECODE(SUBSTR(SYSDATE, 8), 'year') FROM dual; E. SELECT TO_CHAR(SUBSTR(SYSDATE, 8,2),'yyyy') FROM dual;
The EMPLOYEES table contains these columns: LAST_NAME V...
The EMPLOYEES table contains these columns: LAST_NAME VARCHAR2 (25) SALARY NUMBER (6,2) COMMISSION_PCT NUMBER (6) You need to write a query that will produce these results: 1. Display the salary multiplied by the commission_pct. 2. Exclude employees with a zero commission_pct. 3. Display a zero for employees with a null commission value. Evaluate the SQL statement: SELECT LAST_NAME, SALARY*COMMISSION_PCT FROM EMPLOYEES WHERE COMMISSION_PCT IS NOT NULL; What does the statement provide? （）
A. All of the desired results B. Two of the desired results C. One of the desired results D. An error statement
