Insert command falls in which sub-language of SQL ?

Correct Answer: Executive plan can be defined as: * SQL Server caches collected procedure or the plan of query execution and used thereafter by subsequent calls * An important feature in relation to performance enhancement * Data execution plan can be viewed textually or graphically

Correct Answer: TRUE

Explanation:

The code segments B and D will compile without any error. A is not a valid way to construct a StringBuffer, you need to create a StringBuffer object using "new". B is a valid construction of a Boolean (any string other than "true" or "false" to the Boolean constructor will result in a Boolean with a value of "false"). C will fail to compile because the valid range for a byte is -128 to +127 (i.e., 8 bits, signed). D is correct, 0x1234 is the hexadecimal representation in java. E fails to compile because the compiler interprets 1.2 as a double being assigned to a float (down-casting), which is not valid. You either need an explicit cast, as in "(float)1.2" or "1.2f", to indicate a float.

Correct Answer: Compilation and output of "Not equal! 10"

Explanation:

The output will be "Not equal! 10". Please note that && is logical AND operator. If first operand before (&&) is false then the other operand will not be evaluated. This illustrates that the Output +=10 calculation was never performed because processing stopped after the first operand was evaluated to be false. If you change the value of b1 to true, processing occurs as you would expect and the output would be "We are equal 20".

Correct Answer: A database that contains multiple tables related through common fields A common field is a field of data that is shared among all forms in a database Without them, it would be difficult and/or time-consuming to create other forms

Correct Answer: Candidate Key ? A Candidate Key can be any column or a combination of columns that can qualify as unique key in database There can be multiple Candidate Keys in one table Each Candidate Key can qualify as Primary Key Primary Key ? A Primary Key is a column or a combination of columns that uniquely identify a record Only one Candidate Key can be Primary Key One needs to be very careful in selecting the Primary Key as an incorrect selection can adversely impact the database architect and future normalization For a Candidate Key to qualify as a Primary Key, it should be Non-NULL and unique in any domain

Correct Answer: Tabular structure

Explanation:

Data is organized in the form of row and columns, thus it is in tabular structure.

Correct Answer: SQL statements are broadly classified into three They are 1 DDL ? Data Definition Language DDL is used to define the structure that holds the data For example, Create, Alter, Drop and Truncate table 2 DML ? Data Manipulation Language DML is used for manipulation of the data itself Typical operations are Insert, Delete, Update and retrieving the data from the table The Select statement is considered as a limited version of the DML, since it can't change the data in the database But it can perform operations on data retrieved from the DBMS, before the results are returned to the calling function 3 DCL ? Data Control Language DCL is used to control the visibility of data like granting database access and set privileges to create tables, etc Example - Grant, Revoke access permission to the user to access data in the database

Correct Answer: 3

Explanation:

To join 'n' tables 'n-1' conditions should be satisfied.

So to join 4 tables 3 conditions should be satisfied.

Correct Answer: Alter database backup control file to trace

Correct Answer: An index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval Index can be created on one or more columns of a table