SQL Questions

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

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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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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

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Q:

Write SQL Query to display current date?

Answer

The built in function called GetDate() returns the time stamp.

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Q:

How would apply date range filter?

Answer

One can use simple conditions like >= and <=, or use between/and but the trick here is to know your exact data type.


 


- Sometimes date fields contain time and that is where the query can go wrong so it is recommended to use some date related functions to remove the time issue. In SQL Server common function for accomplishing the task datediff () function.


- Interviewees also have to be aware of different time zones and server time zone.


-To increase query performance you may still want to use between however you should be aware of proper format you should use if not it might misbehave during filtering.

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