1
Q:

Write a SQL Query to find year from date. 

Answer:



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 & Explanation 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.

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2 1206
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.

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1 2442
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

1 1152
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

5 4649
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 3869
Q:

Write an SQL Query to check whether date passed to Query is date of given format or not.

Answer

SQL has IsDate() function which is used to check passed value is date or not of specified format ,it returns 1(true) or 0(false) accordingly.


SELECT  ISDATE('1/08/13') AS "MM/DD/YY";


It will return 0 because passed date is not in correct format.

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Subject: SQL - Technology

4 5014
Q:

What is Catalog Views?

Answer

Catalog views return information that is used by the SQL Server Database Engine. Catalog Views are the most general interface to the catalog metadata and provide the most efficient way to obtain, transform, and present customized forms of this information. All user- available catalog metadata is exposed through catalog views.

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Subject: SQL - Technology

1 728
Q:

How to rebuild Master Database?

Answer

Master database is system database and it contains information about running server's configuration. When SQL Server 2005 is installed it usually creates master, model, msdb, tempdb resource and distribution system database by default. Only Master database is th one which is absolutely must have database. Without Master database SQL Server cannot be started. This is the reason it is extremely important to backup Master database.


To rebuild the Master database, Run Setup.exe, verify, and repair a SQL Server instance, and rebuild the system databases. This procedure is most often used to rebuild the master database for a corrupted installation of SQL Server.

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Subject: SQL - Technology

0 1103