mysql - How to get All categories comma separated from this query -


i have 2 tables posts, categories. here in posts table stored category values comma separated string 5,8,23,7. while displaying posts, want show post categories comma separated flower, birds, animals. tried queries nothing helped me it. posts table example.

id  post title      categories 3   example post     5,7,23,8

and categories table this

id   name   5    flowers 7    animals 8    birds 23   naturals

and want result 

id  post tile        category 3   example post     flowers, animals, birds

for tried query didn't me .

select post.id, post.post_title, (select cat.name categories cat cat.id in (post.category)) categories posts post

and returns 1 category, retrieves first category name only.

edit: updated consider fact posts.categories csv value.

you need use group_concat() function, , trick posted in sql split comma separated row in order split join csv , create output csv:

select     posts.id,     posts.post_title,     group_concat(categories.name separator ',') `category` posts inner join categories     on categories.id in (         select substring_index(substring_index(posts.categories, ',', n.n), ',', -1) value         (             select a.n + b.n * 10 + 1 n                         (select 0 n union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9)             ,(select 0 n union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) b             order n         ) n         n.n <= 1 + (length(posts.categories) - length(replace(posts.categories, ',', '')))         order value     ) group     posts.id,     posts.post_title

fiddle: http://sqlfiddle.com/#!9/b1ddc9/4


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more