php - Join two tables on the basis of two case obtained from parent table -


i have coin table provides information uploaded coins, , there owner table gives information owner of particular coin. in coin_owners table, there field 'ownership_mode' either 'transfer' or 'reward'. if mode 'transfer', want left join transfer table, , if mode 'reward', want join rewards table.

i have tried using case clause, it's not working.

the query tried is:

select * , coins.id coinid coins left join coin_owners on coin_owners.coin_id = coins.id left join (case when coin_owners.`ownership_mode` = 'transfer' transfer_detail on   transfer_detail.transfer_to = coin_owners.current_owner , transfer_detail.transfer_from = substring_index( coin_owners.previous_owner,  ',',  '-1' )   when coin_owners.`ownership_mode` = 'reward' rewards on rewards.`coin_ids` = coin_owners.coin_id , coin_owners.`ownership_mode` =  'reward' , status =  '0' ) coins.id ='".validstring($_request["coinid"])."' limit 0,1

thanks lot...but have used following query , works fine >----> 

select * , coins.id coinid coins  left join coin_owners on coin_owners.coin_id = coins.id  left join transfer_detail on transfer_detail.coin_id = coin_owners.coin_id , transfer_detail.transfer_to = coin_owners.current_owner , transfer_detail.transfer_from = substring_index( coin_owners.previous_owner,  ',',  '-1' ) , coin_owners.`ownership_mode` =  'transfer' left join rewards on rewards.`coin_ids` = coin_owners.coin_id  , coin_owners.`ownership_mode` =  'reward' , status =  '0'  coins.id ='".mysql_real_escape_string(trim($_request["coinid"]))."' limit 0,1

thanks of help


Comments

Post a Comment

Popular posts from this blog

linux - xterm copying to CLIPBOARD using copy-selection causes automatic updating of CLIPBOARD upon mouse selection -

i've tried various ways coerce xterm (versions 285 , 292) copy selection clipboard clipboard whenever press ctrl-shift-c. promising way far has been, in ~/.xresources, put this: xterm*vt100.translations: #override \ ctrl shift <keypress> c: copy-selection(clipboard) \n\ ctrl shift <keypress> v: insert-selection(clipboard) ctrl-shift-v works perfectly, copying has nuance... if restart xterm, highlighting text puts things in primary clipboard; expected, proper, default behavior. if hit ctrl-shift-c, copies current selection clipboard clipboard. the bug, however, if highlight text after first time pressed ctrl-shift-c, you'll see highlighting copies both primary and clipboard. cannot figure out how stop xterm updating clipboard upon selection... , doesn't make sense me in first place. i said, @ specific point in time, copy selection clipboard... yet starts updating automatically upon selection after doing once... anyone have workaround...
Read more

c++ - qgraphicsview horizontal scrolling always has a vertical delta -

Image
i've subclassed qgraphicsview custom canvas used in cad application. i've reimplemented qgraphicsview::wheelevent check keyboard modifiers control key and, if control key pressed, zoom. i'm trying implement horizontal scroll when user holds shift , uses wheel. the problem i'm having horizontal scrolling always scrolls 0.279. not huge problem, hugely annoying , points else being wrong. so, here questions: is right way implement horizontal scrolling? if not, is? how eliminate delta of 0.279? thanks in advance. code , sample output below void myview::zoom(int delta) { double factor = pow(1.2, delta/abs(delta)); this->scale(factor, factor); } void myview::scrollhorizontal(int level) { qpointf center = maptoscene(viewport()->rect().center()); qdebug() << "center: " << center.x() << ", " << center.y(); centeron(qpointf(center.x() - level, center.y())); } void myview::wheelevent(qwheeleve...
Read more