php - MySQL LIMIT 1 but query 15 rows? -


basically i'm trying compare id's of rows against 15 results in mysql, eliminating 1 (using not in) , pull result.

now fine itself, order of 15 rows i'm doing sql query changing based on ranking, there possibility between time ranking updates, , ajax request (which submit id's not in) more 1 id has changed, of course bring more 1 row not want.

so in short, there way in can query 15 rows, return one? without having run 2 separate queries. appreciated, thank you.

example:

say have 7 items in database, , i'm displaying 5 on page user.

these being displayed user:

apple orange kiwi banana grape

but in database have

peach blackberry

now want if user deletes item list, add item (based on ranking have)

now issue is, in order know have on list @ moment send remaining items database (say deleted kiwi, send apple, orange, banana, , grape)

so select highest ranked 5 items remaining 6 items, make sure not ones displayed on page, , add new 1 list (either peach or blackberry)

all , well, except if both peach , blackberry outrank grape, returning 2 results instead of one. because would've queried...

apple orange banana peach blackberry

and excluded...

apple orange banana grape

which leaves both peach , blackberry, instead of peach or blackberry

i'm not sure understood requirements, i'll give try. following example based on understanding, , assumes want display top five rows.

select   ul.itemname   userlist ul   (ul.deleted = 0) -- take items not deleted  union -- union clause discards duplicate entries, unlike union  select   i.itemname   (select     il.itemname       itemlist il -- table containing items   order     il.ranking asc -- important items first, supposing lower number in ranking means higher priority   ) limit 5 -- display top 5 entries

note: query untested, , there's chance won't return items in correct order, since lacks order clause. therefore, should taken suggestion , not complete solution.


Comments

Post a Comment

Popular posts from this blog

java - Play! framework 2.0: How to display multiple image? -

i need display gallery of photos. here template: @(photos: list[photo]) @title = { <bold>gallery</bold> } @main(title,"photo"){ <ul class="thumbnails"> @for(photo <- photos) { <li class="span3"> <a href="#" class="thumbnail"> <img src="@photo.path" alt=""> </a> </li> } </ul> } and here controller method: public static result getphotos() { return ok(views.html.photo.gallery.render(photo.get())); } and here photo bean : @entity public class photo extends model { @id public long id; @required public string label; public string path; public photo(string path, string label) { this.path = path; this.label = label; } private static finder<long, photo> find = new finder<long, photo>( long.class, photo.class); public static list<phot...
Read more

gmail - Is there any documentation for read-only access to the Google Contacts API? -

i want read-only access user's google contacts. there stackoverflow member wanted this, , received following answer : yes, there is, use https://www.googleapis.com/auth/contacts.readonly scope , "view contacts". this exchange reference read-only access google contacts can find using google. simply using access token obtained attempt read usual google contacts api (i.e. https://www.google.com/m8/feeds ) fails insufficient permissions. similarly, using google contacts api on new target fails 404 errors (for example https://www.googleapis.com/auth/contacts.readonly/default/full ). is there documentation anywhere on how use api, or permissible way access google contacts api full read-write access?
Read more

php - Controller/JToolBar not working in Joomla 2.5 -

relevant code: jtoolbarhelper::custom('savecategories', 'save', '', 'save', false, false); ... <input type="hidden" name="controller" value="easyblogcontroller"> according can dig docs , own previous questions, should call savecategories() function in easyblogcontroller . i've tried setting value easyblog , easyblog.php (file name) current easyblogcontroller (class name). clicking on save button refreshes page. not redirect, echo or var_dump test code put in savecategories() function. var_dump ing jrequest::getvar('controller') , 'task' return correct values. creating controller object , using $controller->execute('task'); works. the values going depend on location of controller trying call, , have couple options here. typically there controller in base folder of component (likely components/com_easyblog) in file called controller.php , class name inside ...
Read more