SQL 면접 질문과 답변
Test your skills through the online practice test: SQL Quiz Online Practice Test
Ques 96. Which is the subset of SQL commands used to manipulate Oracle Database structures, including tables?
Data Definition Language (DDL).
도움이 되었나요?
Add Comment
View Comments
Ques 97. What is the use of DESC in SQL?
DESC has two purposes. It is used to describe a schema as well as to retrieve rows from table in descending order.
Explanation :
The query SELECT * FROM EMP ORDER BY ENAME DESC will display the output sorted on ENAME in descending order.
도움이 되었나요?
Add Comment
View Comments
Ques 98. What command is used to create a table by copying the structure of another table?
CREATE TABLE .. AS SELECT command
Explanation:
To copy only the structure, the WHERE clause of the SELECT command should contain a FALSE statement as in the following.
CREATE TABLE NEWTABLE AS SELECT * FROM EXISTINGTABLE WHERE 1=2;
If the WHERE condition is true, then all the rows or rows satisfying the condition will be copied to the new table.
도움이 되었나요?
Add Comment
View Comments
Ques 99. TRUNCATE TABLE EMP; DELETE FROM EMP; Will the outputs of the above two commands differ?
Both will result in deleting all the rows in the table EMP..
도움이 되었나요?
Add Comment
View Comments
Ques 100. What is the output of the following query SELECT TRUNC(1234.5678,-2) FROM DUAL;?
1200.
도움이 되었나요?
Add Comment
View Comments
Most helpful rated by users: