MCQs Test!! VB Basic Test !! Essentials of VB !! Creating User Services !! function !! Anatomy !! GK March-2019 !! DATA TYPES IN JAVA !! Classes ,Constructor ,Methods,Inheritance !! Ecology-I !! Biology 2019 !! Gk april 2019 !! Biology (living world) !! Plant anatomy !! CELL STRUCTURES AND FUNCTION !! General biology !! Human physiology !! Data structure !! Ecology-II !! GK TEST !! Reproduction in plants !! Human reproduction !! The ABC of C !! Operating system set1 !! Operating system set2 !! Gk and current affairs !! Animal kingdom !! Number system !! Animal kingdom-II !! Gk TEST-III !! Number series !! Microorganisms !! Interview question in c !! Time and Work !! Percentage !! General history !! Average !! Cells !! Locomotion and Movement !! paging !! Bacteriology !! Page replacement policy !! Secondary memory and Disk scheduling !! Introduction of Nervous System and neurons !! Plant harmones !! Transport and Mineral Nutrition in Plants !! Neurotransmitters !! Modern Indian History !! Photosynthesis in Plants !! Modern Indian History-II !! Plant respiration !! Environment & Biodiversity !! Environment & Biodiversity - II !! Algae, Bryophytes, Pteridophytes !! Area !! Cricket !! Days of the Year (India and the World) !! Plant Pathology - I !! Indian Transport System !! Plant Pathology - II !! Aptitude !! Biology !! Botany !! C language !! Computer Science !! Core Java !! Gate !! GK !! Mysql !! Operating system !! Physics !! VB-Visual Basic !! Zoology

DATABASE & SQL/PLSQL

Limits the rows by using
Previous Home Next

Using TOP keyword

The TOP clause used with the SELECT statement. It is used to limits the number of rows returned in the result set

SELECT [TOP n] column_mame
FROM table_name
WHERE search_conditions 

'n'=number of rows that you want to retrieve.

Example


SELECT TOP 5 pub_id,pub_name,country
FROM publishers
WHERE country LIKE 'U%'
ORDER BY pub_id DESC

Returns all top 5 rows ,pub_id, pub_name and country,& from the publishers table in descending order & with respect to pub_id.

 

Using DISTINCT keyword

It also used to limit the result set. The DISTINCT keyword remove the duplicate row from the returned result set. It used with the SELECT statement.

SELECT  DISTINCTcolumn_mame
FROM table_name
WHERE search_conditions 

Example:

SELECT DISTINCT country
FROM publishers
WHERE city LIKE 'B%'

Return country name which started with a 'B' alphabet but no repetition, means no duplicate value of country.

Previous Home Next