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Saturday, October 10, 2015

Izbor redova koje upit treba da vrati-limit (The selection of rows that query should return-LIMIT)

Limit je jedna od odredaba iskaza select koja omogucava da naznacite koji redovi iz rezultata treba da budu vraceni. Ova odredba ima dva parametra: broj pocetnog reda i ukupan broj redova koje upit treba da vrati.

Primer: 

select ime
from kupci
limit 2, 3;

Ovaj fajl sacuvajte kao limit.sql.

1. Pokrenite XAMPP. Kliknite na Admin u liniji MySQL-a ili ukucajte u address bar http://localhost/phpmyadmin/

2. Sa leve strane izaberite bazu podataka volimmotore, a sa desne izberite karticu SQL.

3. Ubacite ovaj kod i kliknite dugme "Go".





Objasnjenje: navedeni upit mozete citati kao: "ucitaj podatke iz kolone name; vrati 3 reda podataka. pocev od reda broj 2 u skupu rezultata". 

Napomena: brojevi redova pocinju od 0, sto znaci da je nula redni broj prvog reda u rezultatima.

Ovo je korisno, npr. kada kupac pretrazuje katalog a vi hocete da prikazete 10 artikala po stranici. 

Napomena: ANSI standard za SQL ne podrzava odredbu limit

The LIMIT is one of the clause of the statement SELECT which enable you to specify which rows from the result should be returned. This clause has two parameters: the number of the initial row and the total number of rows that a query should return.

Example:

SELECT name
FROM customers
LIMIT 2, 3;

Save this file as limit.sql.

1. Start XAMPP. Click on the Admin in line MySQL or type in the address bar 
http://localhost/phpmyadmin/

2. From the left select the database lovebikes, and on the right select the SQL tab.
3. Insert this code and click "Go".



Explanation: 

The query can read as: "load data from a column name, and return 3 rows of data. starting with the row number 2 in the result set."

Note: numbers of rows start from 0, which means that the zero is ordinal number of the first roe in the results.

This is useful, for example, when a customer searches the catalog and you want to display 10 items per page.

Note: 
The ANSI standard for SQL does not support the clause LIMIT.

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