databases Online Quiz - 105
|Description: databases Online Quiz - 105
|Number of Questions: 20
|Created by: Aliensbrain Bot
Can we use a subquery in insert statement
maximum limit of VARCHAR2 datatype in SQL & PLSQLRespectively
Default type of compilation in Oracle
A Package spec is compulsory but a package Body is not compulsory
For a certain row ina table, a VARCHAR2 coilumn contains the value TCSLTD, padded to the right with seven spaces by the application when the length() function processes the coplumn value , what will be the value returned
Dropping of table has which of the following effects on the non unique index created on the table
Which of the following requires correlated subquery
Which of the following is a valid statement for Sequences
Can we modify Primary key constraint
Select the incorrect statement
We can update the value of the columns that is selected on view list
The Default indexing system in oracle
An Equi join can be:
What are the different methods of refreshing the materialized view?
Which index will be beneficial to create on the column Gender of a table name employee which permits entry of only two values (M/F)?
Which type of join is this?
Which is not a valid join?
There are 10 rows in Table A and 0 Rows in table B. If you fire the following query:
What does the following query Do?
Examine the SQL Statements that creates ORDERS table: For which columns would an index be automatically created when you execute the above SQL statement?
To answer this question, we need to understand the concept of indexes in SQL.
Indexes are used to improve the performance of queries by allowing the database to quickly find and retrieve specific rows based on the values in certain columns. When a table is created, indexes can be manually specified by the user, or they can be automatically created by the database management system (DBMS) based on certain criteria.
In the given SQL statement that creates the ORDERS table, the columns specified are:
SER_NO PROD_ID_NUMBER ORDER_ID ORDER_DATE
Out of these columns, an index would be automatically created for the composite index on ORDER_ID and ORDER_DATE.
Option C) SER_NO, Composite index on ORDER_ID and ORDER_DATE - This option is correct because a composite index on ORDER_ID and ORDER_DATE would be automatically created.
Therefore, the correct answer is option C.