sql - mysql search words in text column sorted by # world matched -


problem:

the text input 3 or 4 words, want show field contain @ least 1 of these words.

for example if words "alpha bravo charlie delta" want allow results

charlie bravo name charlie alphaness alpha , delta addeltas bravo delta , alpha , bravo bbbbravoooo charlieeeee

no problem till here, use query:

select * subject name '%alpha%' or name '%bravo%' or name '%charlie%' or name '%delta%

but want show results in particular order, results more relevant when

  • more words occurance more relevante result should be, "charlie bravo" shows before "bravo"

i found solution that

select  * ,       (           (char_length(col1) - char_length(replace(col1,'alpha','')))           / char_length('alpha')   +           (char_length(col1) - char_length(replace(col1,'bravo','')))           / char_length('bravo')   +           (char_length(col1) - char_length(replace(col1,'delta','')))           / char_length('delta')   +           (char_length(col1) - char_length(replace(col1,'charlie','')))           / char_length('charlie')          ) occurances    yourtable order         occurances desc

but need other order rules:

  • if record begin searched word more relevant es."alpha and..."
  • if word in record begin searched word more relevant es."what alphaness"
  • searched word inside record es."addeltas"

i find solution these order problem but, how combine both?

 select id, name     subjects     name '%alpha%'     order        name 'alpha%' desc,       ifnull(nullif(instr(name, ' alpha'), 0), 99999),       ifnull(nullif(instr(name, 'alpha'), 0), 99999),       name;

so conclude if search "alpha bravo" results should be:

delta , alpha , bravo (contain both words first) alpha , delta (begin first word searched) bravo (begin second word searched) alphaness (has first word searched begin of word) charlie bravo (has second word searched begin of word) bbbbravoooo charlieeee (has second word searched inside)

ps need case insensitive , without distinction accented letters òàùèìé è = e

looks need stored function calculate weight used in ordering.

e.g. weight 0.

if word found in field weight+=1000

if word beginning of record weight+=100

if word beginning of word weight+=10

weight+=(amount of words - word index) order of word

so passing search "alpha bravo" returns 

1000+10+1 + 1000+10 delta , alpha , bravo (contain both words first) 1000+100+1 alpha , delta (begin first word searched) 1000+100 bravo (begin second word searched) 1000+10+1 alphaness (has first word searched begin of word) 1000+10 charlie bravo (has second word searched begin of word) 1000 bbbbravoooo charlieeee (has second word searched inside)

Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more