3
Q:

Which is the subset of SQL commands used to manipulate Oracle Database structures, including tables ?

A) Data Manipulation Language(DML) B) Data Definition Language(DDL)
C) Both A & B D) None

Answer:   B) Data Definition Language(DDL)



Explanation:

The Data Definition Language (DDL) is used to manage table and index structure.

CREATE,

ALTER,

RENAME,

DROP and

TRUNCATE

statements are the names of few data definition elements.

Q:

What operator tests column for the absence of data?

A) NOT operator B) IS NULL operator
C) EXISTS operator D) All of the above
 
Answer & Explanation Answer: B) IS NULL operator

Explanation:

SELECT "column_name"


FROM "table_name"


WHERE "column_name" IS NULL.

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0 84
Q:

We can modify an existing Company from

A) Company Info > Alter B) Gateway of Tally > Modify Company
C) Company Info > Alter Company D) All of the above
 
Answer & Explanation Answer: A) Company Info > Alter

Explanation:
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1 110
Q:

The multi part identifier could not be bound is

Answer

One of the most common errors that you might face in join statements is 


 


Server: Msg 4104, Level 16, State 1, Line 1
The multi-part identifier could not be bound.


 


A multipart identifier is any description of a field or table that contains multiple parts - for instance MyTable.SomeRow - if it can't be bound that means there's something wrong with it - either you've got a simple typo, or a confusion between table and column. It can also be caused by using reserved words in your table or field names and not surrounding them with [].


 


The main reason for this error is that the source table cannot be found, for example if you have statement such as Table1.OrderDate, and then if you get error above, this means that Table1 cannot be found in the query. Sometimes you can see that source table exists in the query, but T-SQL cannot understand it, especially when you write join statements.

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0 125
Q:

What UNION does in SQL?

Answer

In SQL, UNION  merges the contents of two structurally-compatible tables into a single combined table.

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0 116
Q:

Which operator performs pattern matching ?

A) LIKE operator B) EXISTS operator
C) BETWEEN operator D) None of these
 
Answer & Explanation Answer: A) LIKE operator

Explanation:

LIKE is a keyword that is used in the WHERE clause. Basically, LIKE allows us to do a search based operation on a pattern rather than specifying exactly what is desired (as in IN) or spell out a range (as in BETWEEN).

 

The syntax is as follows:
SELECT "column_name"
FROM "table_name"
WHERE "column_name" LIKE {PATTERN}

 

{PATTERN} often consists of wildcards.

 

In SQL, there are two wildcards:


% (percent sign) represents zero, one, or more characters.

_ (underscore) represents exactly one character.

 

More :: Certification Questions on SQL

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6 12352
Q:

Write SQL Query to find second highest salary of Employee.

Answer

There are many ways to find second highest salary of Employee in SQL, you can either use SQL Join or Subquery to solve this problem. Here is SQL query using Subquery :


SELECT MAX(Salary) from Employee WHERE Salary NOT IN (select MAX(Salary) FROM Employee );

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Subject: SQL - Technology

2 1871
Q:

Write an SQL Query find number of employees according to gender whose DOB is between 01/01/1960 to 31/12/1975.

Answer

SELECT COUNT(*), sex from Employees  WHERE  DOB BETWEEN ‘01/01/1960 ' AND ‘31/12/1975’  GROUP BY sex;

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Subject: SQL - Technology

8 6962
Q:

find all Employee records containing the word "Joe", regardless of whether it was stored as JOE, Joe, or joe.

Answer

SELECT  * from Employees  WHERE  upper(EmpName) like upper('joe%');

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Subject: SQL - Technology

4 5475