Using Ajax to suggest unavaliable number using current list numbers - php

is it possible to using ajax with PHP/SQL to suggest the next avaliable number for a user based on the current numbers in the list? this is to avoid duplication.
I have a form/table http://i.stack.imgur.com/TYhSG.png and in this table I have for an example departments and a list(the numbers in the list needs to be unqiue). because of the way the system is disigned, users had to manually rearrange the numbers if they wanted to the same number in another department. for an example number "4" can only be used once, this example applies to any other numbers.
The numbers in those list are all avaliable in the database, what this means is that I have a select statement and i echo $list to redender those list you show in the image.
Tp avoid users having to manally tryping those numbers especially if the list is up to 100 or more. I basically want to use ajax to first check if the number in the list is already in used and if yes then suggest a number to them.
Can this be done? If so please show me an example.
Thanks for your time.
p.s.
i missed out an information piece of information they is another column called `values
tablename: check
values type list
cars 1 2
cars 1 4
cars 1 3
bicycle 1 2
bicycle 1 3
bicycle 1 4
the numbers in the list can be used again if the values is different so basically the list needs to be unique to the values is it in.


If the column list needs to be unique and automatically increment, you should be using MySQL's AUTO_INCREMENT
This will automatically populate the column with the next available number on row creation.

Related

Finding items in multiple arrays

Hello I am building a eCommerce web application using Laravel and for my products there are three types of filter for example: Color, Style, Industry and these each filter contains some values like this:
color => red, green, blue yellow....
Style => Bold,Conservative,Elegant,Floral...
Industry => Agriculture & Farming, Animals & Pet Care,Art & Entertainment...
and all products have all three filters so each product have some combination of each filter like Product_1 =>blue,Floral,Agriculture & Farming. I am not inserting filters in my product table instead of that I have created a list of all possible combination with an id of each combination so there are like total 4000 combinations of all three types filters so in my product table in just using a column like filter_ID which holds the ID of combination.
Now when I am showing products I need to count items available for each filter like Agriculture & Farming [ Total Numbers of product with this filler].
And in that combination list I am not using real filter name instead of that I given an Integer ID to each filter like:
Agriculture & Farming = 1, Animals & Pet Care = 2, blue = 3....
So now I have three things to counts available products in each filter.
Combination list
Filter_IDs from Product table
Integer ID of each
Fillter
I tried to count using loops, but its not returning correct value my sample data is large so I can not insert here I am including link to my php file where you can find all data and also what results I need.Link to php file
Code:
// This is all three fillters possible combination in this array 1st level array is a combination
//And in 2nd level array it conatins 4 items which are:
//1st item is Combination ID and
//2nd item is Interger value of actual Fillter (Industry)
//3rd item is Interger value of actual Fillter (Style)
//4th item is Interger value of actual Fillter (color)
// Using this for faster performance
$filltersCombination_integer = [[1,1,14,28],[2,1,14,29],[3,1,14,30],[4,1,14,31],[5,1,14,32],[6,1,14,33],[7,1,14,34],[8,1,14,35],[9,1,14,36],[10,1,14,37],[11,1,14,38],[12,1,14,39],[13,1,14,40],[14,1,14,41],[15,1,14,42],[16,1,14,43],[17,1,14,44],[18,1,14,45],[19,1,14,46],[20,1,15,28],[21,1,15,29],[22,1,15,30],[23,1,15,31],[24,1,15,32],[25,1,15,33],[26,1,15,34],[27,1,15,35],[28,1,15,36],[29,1,15,37],[30,1,15,38],[31,1,15,39],[32,1,15,40],[33,1,15,41],[34,1,15,42],[35,1,15,43],[36,1,15,44],[37,1,15,45],[38,1,15,46],[39,1,16,28],[40,1,16,29],[41,1,16,30],[42,1,16,31],[43,1,16,32],[44,1,16,33],[45,1,16,34],[46,1,16,35],[47,1,16,36],[48,1,16,37],[49,1,16,38],[50,1,16,39],[51,1,16,40],[52,1,16,41],[53,1,16,42],[54,1,16,43],[55,1,16,44],[56,1,16,45],[57,1,16,46],[58,1,17,28],[59,1,17,29],[60,1,17,30],[61,1,17,31],[62,1,17,32],[63,1,17,33],[64,1,17,34],[65,1,17,35],[66,1,17,36],[67,1,17,37],[68,1,17,38],[69,1,17,39],[70,1,17,40],[71,1,17,41],[72,1,17,42],[73,1,17,43],[74,1,17,44],[75,1,17,45],[76,1,17,46],[77,1,18,28],[78,1,18,29],[79,1,18,30],[80,1,18,31],[81,1,18,32],[82,1,18,33],[83,1,18,34],[84,1,18,35],[85,1,18,36],[86,1,18,37],[87,1,18,38],[88,1,18,39],[89,1,18,40],[90,1,18,41],[91,1,18,42],[92,1,18,43],[93,1,18,44],[94,1,18,45],[95,1,18,46],[96,1,19,28],[97,1,19,29],[98,1,19,30],[99,1,19,31],[100,1,19,32],[101,1,19,33],[102,1,19,34],[103,1,19,35],[104,1,19,36],[105,1,19,37],[106,1,19,38],[107,1,19,39],[108,1,19,40],[109,1,19,41],[110,1,19,42],[111,1,19,43],[112,1,19,44],[113,1,19,45],[114,1,19,46],[115,1,20,28],[116,1,20,29],[117,1,20,30],[118,1,20,31],[119,1,20,32],[120,1,20,33],[121,1,20,34],[122,1,20,35],[123,1,20,36],[124,1,20,37],[125,1,20,38],[126,1,20,39],[127,1,20,40],[128,1,20,41],[129,1,20,42],[130,1,20,43],[131,1,20,44],[132,1,20,45],[133,1,20,46],[134,1,21,28],[135,1,21,29],[136,1,21,30],[137,1,21,31],[138,1,21,32],[139,1,21,33],[140,1,21,34],[141,1,21,35],[142,1,21,36],[143,1,21,37],[144,1,21,38],[145,1,21,39],[146,1,21,40],[147,1,21,41],[148,1,21,42],[149,1,21,43],[150,1,21,44],[151,1,21,45],[152,1,21,46],[153,1,22,28],[154,1,22,29],[155,1,22,30],[156,1,22,31],[157,1,22,32],[158,1,22,33],[159,1,22,34],[160,1,22,35],[161,1,22,36],[162,1,22,37],[163,1,22,38],[164,1,22,39],[165,1,22,40],[166,1,22,41],[167,1,22,42],[168,1,22,43],[169,1,22,44],[170,1,22,45],[171,1,22,46],[172,1,23,28],[173,1,23,29],[174,1,23,30],[175,1,23,31],[176,1,23,32],[177,1,23,33],[178,1,23,34],[179,1,23,35],[180,1,23,36],[181,1,23,37],[182,1,23,38],[183,1,23,39],[184,1,23,40],[185,1,23,41],[186,1,23,42],[187,1,23,43],[188,1,23,44],[189,1,23,45],[190,1,23,46],[191,1,24,28],[192,1,24,29],[193,1,24,30],[194,1,24,31],[195,1,24,32],[196,1,24,33],[197,1,24,34],[198,1,24,35],[199,1,24,36],[200,1,24,37],[201,1,24,38],[202,1,24,39],[203,1,24,40],[204,1,24,41],[205,1,24,42],[206,1,24,43],[207,1,24,44],[208,1,24,45],[209,1,24,46],[210,1,25,28],[211,1,25,29],[212,1,25,30],[213,1,25,31],[214,1,25,32],[215,1,25,33],[216,1,25,34],[217,1,25,35],[218,1,25,36],[219,1,25,37],[220,1,25,38],[221,1,25,39],[222,1,25,40],[223,1,25,41],[224,1,25,42],[225,1,25,43],[226,1,25,44],[227,1,25,45],[228,1,25,46],[229,1,26,28],[230,1,26,29],[231,1,26,30],[232,1,26,31],[233,1,26,32],[234,1,26,33],[235,1,26,34],[236,1,26,35],[237,1,26,36],[238,1,26,37],[239,1,26,38],[240,1,26,39],[241,1,26,40],[242,1,26,41],[243,1,26,42],[244,1,26,43],[245,1,26,44],[246,1,26,45],[247,1,26,46],[248,1,27,28],[249,1,27,29],[250,1,27,30],[251,1,27,31],[252,1,27,32],[253,1,27,33],[254,1,27,34],[255,1,27,35],[256,1,27,36],[257,1,27,37],[258,1,27,38],[259,1,27,39],[260,1,27,40],[261,1,27,41],[262,1,27,42],[263,1,27,43],[264,1,27,44],[265,1,27,45],[266,1,27,46],[267,2,14,28],[268,2,14,29],[269,2,14,30],[270,2,14,31],[271,2,14,32],[272,2,14,33],[273,2,14,34],[274,2,14,35],[275,2,14,36],[276,2,14,37],[277,2,14,38],[278,2,14,39],[279,2,14,40],[280,2,14,41],[281,2,14,42],[282,2,14,43],[283,2,14,44],[284,2,14,45],[285,2,14,46],[286,2,15,28],[287,2,15,29],[288,2,15,30],[289,2,15,31],[290,2,15,32],[291,2,15,33],[292,2,15,34],[293,2,15,35],[294,2,15,36],[295,2,15,37],[296,2,15,38],[297,2,15,39],[298,2,15,40],[299,2,15,41],[300,2,15,42],[301,2,15,43],[302,2,15,44],[303,2,15,45],[304,2,15,46],[305,2,16,28],[306,2,16,29],[307,2,16,30],[308,2,16,31],[309,2,16,32],[310,2,16,33],[311,2,16,34],[312,2,16,35],[313,2,16,36],[314,2,16,37],[315,2,16,38],[316,2,16,39],[317,2,16,40],[318,2,16,41],[319,2,16,42],[320,2,16,43],[321,2,16,44],[322,2,16,45],[323,2,16,46],[324,2,17,28],[325,2,17,29],[326,2,17,30],[327,2,17,31],[328,2,17,32],[329,2,17,33],[330,2,17,34],[331,2,17,35],[332,2,17,36],[333,2,17,37],[334,2,17,38],[335,2,17,39],[336,2,17,40],[337,2,17,41],[338,2,17,42],[339,2,17,43],[340,2,17,44],[341,2,17,45],[342,2,17,46],[343,2,18,28],[344,2,18,29],[345,2,18,30],[346,2,18,31],[347,2,18,32],[348,2,18,33],[349,2,18,34],[350,2,18,35],[351,2,18,36],[352,2,18,37],[353,2,18,38],[354,2,18,39],[355,2,18,40],[356,2,18,41],[357,2,18,42],[358,2,18,43],[359,2,18,44],[360,2,18,45],[361,2,18,46],[362,2,19,28],[363,2,19,29],[364,2,19,30],[365,2,19,31],[366,2,19,32],[367,2,19,33],[368,2,19,34],[369,2,19,35],[370,2,19,36],[371,2,19,37],[372,2,19,38],[373,2,19,39],[374,2,19,40],[375,2,19,41],[376,2,19,42],[377,2,19,43],[378,2,19,44],[379,2,19,45],[380,2,19,46],[381,2,20,28],[382,2,20,29],[383,2,20,30],[384,2,20,31],[385,2,20,32],[386,2,20,33],[387,2,20,34],[388,2,20,35],[389,2,20,36],[390,2,20,37],[391,2,20,38],[392,2,20,39],[393,2,20,40],[394,2,20,41],[395,2,20,42],[396,2,20,43],[397,2,20,44],[398,2,20,45],[399,2,20,46],[400,2,21,28],[401,2,21,29],[402,2,21,30],[403,2,21,31],[404,2,21,32],[405,2,21,33],[406,2,21,34],[407,2,21,35],[408,2,21,36],[409,2,21,37],[410,2,21,38],[411,2,21,39],[412,2,21,40],[413,2,21,41],[414,2,21,42],[415,2,21,43],[416,2,21,44],[417,2,21,45],[418,2,21,46],[419,2,22,28],[420,2,22,29],[421,2,22,30],[422,2,22,31],[423,2,22,32],[424,2,22,33],[425,2,22,34],[426,2,22,35],[427,2,22,36],[428,2,22,37],[429,2,22,38],[430,2,22,39],[431,2,22,40],[432,2,22,41],[433,2,22,42],[434,2,22,43],[435,2,22,44],[436,2,22,45],[437,2,22,46],[438,2,23,28],[439,2,23,29],[440,2,23,30],[441,2,23,31],[442,2,23,32],[443,2,23,33],[444,2,23,34],[445,2,23,35],[446,2,23,36],[447,2,23,37],[448,2,23,38],[449,2,23,39],[450,2,23,40],[451,2,23,41],[452,2,23,42],[453,2,23,43],[454,2,23,44],[455,2,23,45],[456,2,23,46],[457,2,24,28],[458,2,24,29],[459,2,24,30],[460,2,24,31],[461,2,24,32],[462,2,24,33],[463,2,24,34],[464,2,24,35],[465,2,24,36],[466,2,24,37],[467,2,24,38],[468,2,24,39],[469,2,24,40],[470,2,24,41],[471,2,24,42],[472,2,24,43],[473,2,24,44],[474,2,24,45],[475,2,24,46],[476,2,25,28],[477,2,25,29],[478,2,25,30],[479,2,25,31],[480,2,25,32],[481,2,25,33],[482,2,25,34],[483,2,25,35],[484,2,25,36],[485,2,25,37],[486,2,25,38],[487,2,25,39],[488,2,25,40],[489,2,25,41],[490,2,25,42],[491,2,25,43],[492,2,25,44],[493,2,25,45],[494,2,25,46],[495,2,26,28],[496,2,26,29],[497,2,26,30],[498,2,26,31],[499,2,26,32],[500,2,26,33],[501,2,26,34],[502,2,26,35],[503,2,26,36],[504,2,26,37],[505,2,26,38],[506,2,26,39],[507,2,26,40],[508,2,26,41],[509,2,26,42],[510,2,26,43],[511,2,26,44],[512,2,26,45],[513,2,26,46],[514,2,27,28],[515,2,27,29],[516,2,27,30],[517,2,27,31],[518,2,27,32],[519,2,27,33],[520,2,27,34],[521,2,27,35],[522,2,27,36],[523,2,27,37],[524,2,27,38],[525,2,27,39],[526,2,27,40],[527,2,27,41],[528,2,27,42],[529,2,27,43],[530,2,27,44],[531,2,27,45],[532,2,27,46],[533,3,14,28],[534,3,14,29],[535,3,14,30],[536,3,14,31],[537,3,14,32],[538,3,14,33],[539,3,14,34],[540,3,14,35],[541,3,14,36],[542,3,14,37],[543,3,14,38],[544,3,14,39],[545,3,14,40],[546,3,14,41],[547,3,14,42],[548,3,14,43],[549,3,14,44],[550,3,14,45],[551,3,14,46],[552,3,15,28],[553,3,15,29],[554,3,15,30],[555,3,15,31],[556,3,15,32],[557,3,15,33],[558,3,15,34],[559,3,15,35],[560,3,15,36],[561,3,15,37],[562,3,15,38],[563,3,15,39],[564,3,15,40],[565,3,15,41],[566,3,15,42],[567,3,15,43],[568,3,15,44],[569,3,15,45],[570,3,15,46],[571,3,16,28],[572,3,16,29],[573,3,16,30],[574,3,16,31],[575,3,16,32],[576,3,16,33],[577,3,16,34],[578,3,16,35],[579,3,16,36],[580,3,16,37],[581,3,16,38],[582,3,16,39],[583,3,16,40],[584,3,16,41],[585,3,16,42],[586,3,16,43],[587,3,16,44],[588,3,16,45],[589,3,16,46],[590,3,17,28],[591,3,17,29],[592,3,17,30],[593,3,17,31],[594,3,17,32],[595,3,17,33],[596,3,17,34],[597,3,17,35],[598,3,17,36],[599,3,17,37],[600,3,17,38],[601,3,17,39],[602,3,17,40],[603,3,17,41],[604,3,17,42],[605,3,17,43],[606,3,17,44],[607,3,17,45],[608,3,17,46],[609,3,18,28],[610,3,18,29],[611,3,18,30],[612,3,18,31],[613,3,18,32],[614,3,18,33],[615,3,18,34],[616,3,18,35],[617,3,18,36],[618,3,18,37],[619,3,18,38],[620,3,18,39],[621,3,18,40],[622,3,18,41],[623,3,18,42],[624,3,18,43],[625,3,18,44],[626,3,18,45],[627,3,18,46],[628,3,19,28],[629,3,19,29],[630,3,19,30],[631,3,19,31],[632,3,19,32],[633,3,19,33],[634,3,19,34],[635,3,19,35],[636,3,19,36],[637,3,19,37],[638,3,19,38],[639,3,19,39],[640,3,19,40],[641,3,19,41],[642,3,19,42],[643,3,19,43],[644,3,19,44],[645,3,19,45],[646,3,19,46],[647,3,20,28],[648,3,20,29],[649,3,20,30],[650,3,20,31],[651,3,20,32],[652,3,20,33],[653,3,20,34],[654,3,20,35],[655,3,20,36],[656,3,20,37],[657,3,20,38],[658,3,20,39],[659,3,20,40],[660,3,20,41],[661,3,20,42],[662,3,20,43],[663,3,20,44],[664,3,20,45],[665,3,20,46],[666,3,21,28],[667,3,21,29],[668,3,21,30],[669,3,21,31],[670,3,21,32],[671,3,21,33],[672,3,21,34],[673,3,21,35],[674,3,21,36],[675,3,21,37],[676,3,21,38],[677,3,21,39],[678,3,21,40],[679,3,21,41],[680,3,21,42],[681,3,21,43],[682,3,21,44],[683,3,21,45],[684,3,21,46],[685,3,22,28],[686,3,22,29],[687,3,22,30],[688,3,22,31],[689,3,22,32],[690,3,22,33],[691,3,22,34],[692,3,22,35],[693,3,22,36],[694,3,22,37],[695,3,22,38],[696,3,22,39],[697,3,22,40],[698,3,22,41],[699,3,22,42],[700,3,22,43],[701,3,22,44],[702,3,22,45],[703,3,22,46],[704,3,23,28],[705,3,23,29],[706,3,23,30],[707,3,23,31],[708,3,23,32],[709,3,23,33],[710,3,23,34],[711,3,23,35],[712,3,23,36],[713,3,23,37],[714,3,23,38],[715,3,23,39],[716,3,23,40],[717,3,23,41],[718,3,23,42],[719,3,23,43],[720,3,23,44],[721,3,23,45],[722,3,23,46]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// Available Filter_IDs from Product table
$items = [17,815,2411,839,400,1200,12,19,1,15,16,18,11,8,9,13,3,274,282,285,273,283,267,275,281,810,814,809,806,807,801,800,533,541,537,594,599,608,535,605,542,606,547,596,598,600,540,548,607,549,534,592,539,601,544,551,546,550,538,536,0,543,1067,1081,1074,1069,1070,1073,1079,1065,1066,1072,1336,1339,1335,1331,1333,1332,1338,1347,1340,1344,1342,1341,1345,1337,1871,1868,1863,1870,1872,1875,1877,1879,1869,1865,1878,2136,2139,2138,2131,2143,2134,2137,2135,2146,2133,2132,2130,2129,2140,2409,2404,2405,2403,2401,2396,2410,2412,2400,2413];
//Fillter_1 Numeric IDS are 1 To 13
//Fillter_2 Numeric IDS are 14 To 27
//Fillter_3 Numeric IDS are 28 To 46

This kind of approach to solve such tasks is too JS! Some fundamental back-end programming lessons would be helpful in the long run.
For this one I could recommend to re-consider your data model or at least the usage of it. Assuming you're using a proper relational ER-Model, it's better to avoid re-inventing the wheel and just use the DB query builder provided by the framework and leave the rest (counting etc...) to the existing PHP methods… Eventually no need for any primitive loops or similar complex solutions. So you'll have a convention-friendly code and won't need to attach the whole large file in the future as well!
Good Luck!

how to make a ranking with mysql and php

Me and my friends are choosing a group name, and I'm trying to make this ranking where all of us sort the name order by our preferences.
My program should do a calculation based on the order.
Example, if I sort "JAIME" 1 and "CERSEI" 2, "JAIME" gets 10 points and "CERSEI" 8 points. If my friend sort "JAIME" 1 and "CERSEI" 6, "JAIME gets 10 points and "CERSEI" get's no points.
So, the rank will be:
1- JAIME with 20 points
2- CERSEI with 8 points
I have a simple table in mysql called "NAMES" with these fields
"id"
"name"
"riccardo"
"roberto"
"marika"
(and others friend names)
With a Jquery script, every friend can sort the name list. The order number is automatically entered in the mysql db.
So, for example:
"id" --> 1
"name" --> JAIME
"riccardo" --> 1
"roberto" --> 2
"marika" --> 5
1, 2, 5 are the order list number
Now that I got here, I have no idea how to proceed to obtain a rank based on the orders lists :(
hope my question is understandable
thank you

Firstly I'd consider changing your schema somewhat. Currently adding friends means adding columns (which also means updating your queries). Better to have say a friends table and then a table for friends-names ratings.
However with what you have the calculation for a score given a position is:
10-((score-1)*2)
Given this we can create a query to get scores for names:
SELECT id, name, 10-((riccardo-1)*2) + 10-((roberto-1)*2) as score-- Plus all other names
FROM names
ORDER BY score
Using a more usual schema the query would look something like:
SELECT names.id, names.name, SUM(10-((names_ratings.rating-1)*2)) as score
FROM names
LEFT JOIN names_ratings ON (names.id = names_rating.name_id)
ORDER BY score
The second query means that you can add and remove friends much more easily and this wont change the code or the database schema.

MySQL or PHP to merge 2 tables to give me over table

I am running a competition where a user enters a team of 3 golfers chosen form a specific list. These entries are then stored in a table - entries with username,player1,player2,player3.
In a different table in the same database I have players results with each player have a player_name,round1score,round2score,round3score,round4score & totalscore.
I want to create a results set which adds the results of a users 3 players (their team) and sorts them with the lowest score for the combined 3 players.
I am having trouble combining the 2 tables and some people are saying the to merge them using PHP afterwards but not sure the best option.
Also I need to after the final round if there is a tie for 1st place make the team with the lowest round4score the top of the results.
Any help or advice on how to achieve this would be greatly appreciated.
Thanks

How to Store Multiple Options selected by User in a Table

So I want my users to be able to restrict who may contact them.
There are several factors they should be able to filter, including Age (e.g. Must be between 18 - 29), income (must earn between $25,000 - $60,000), what they're looking for (e.g. Friendship, Hang out, etc.), what drugs they do (Marijuana, Meth, Cocaine, etc), etc.
The problem is, I want them to be able to select and store multiple choices for some of the criteria (e.g. drugs), but I do not know how I should store that in the DB or how I should structure the table to best accomplish that.
For example, how would I store a user's row that for "drugs" chose "Marijuana", "Cocaine", and "Heroin" within this context? Would I simply store those as comma-separated values in the "Drugs" column? Or should I do it in a completely different way?
What would be the best way to do this (considering I will obviously have to retrieve and check this information every time a user wants to contact another user) and why?

No, don't store the values in CSV format in the database. Instead create a join table called user_drug and store one row for each user/drug combination:
user
id name income
1 Foo 10000
2 Bar 20000
3 Baz 30000
drug
id name
1 Marijuana
2 Cocaine
3 Heroin
user_drug
user_id drug_id
1 1
1 2
2 1
2 3
3 3

A DB column (at least theorethically) should NOT hold multiple values. Unfortunately, there are some programmers that store multiple values in a single column (values separated by comma for examples) - those programmers (in most cases) destroy the concept of DB and SQL.
I suggest you to read about Database Normalization to get a start in organizing your tables. And, do your best to achieve the Codd's Third Normal Form

You can try with this:
criterium
------------
user_id type value
1 AGE_MIN 18
1 AGE_MAX 29
1 INCOME_MIN 25000
1 INCOME_MAX 60000
1 DRUGS Marijuana
1 DRUGS Meth

Storing table references in text field (for Agile Toolkit)

I have been experimenting with RDB design lately, and I was wondering about storing items in a field that can have more than one value:
CARS Color_avail
1 corvette 1, 2, 3 <<<<<<<
2 ferrari 2
3 civic 1
COLORS
1 red
2 White
3 black
so on CRUD I would like to add more than one item via a drop down / checkboxes or something that would hold multiple values.

I can see the benefit of displaying the output like this in a form, but do you really want to store it like this in the database ?
For example with a datamodel that holds a comma separated list as in your example, what SQL would you use to identify all the cars available in white ?
The traditional way to hold a many to many relationship like this is to use an additional table e.g. you have a separate table that holds CAR_COLOUR with the following contents
CAR COLOUR
1 1
1 2
1 3
2 2
3 1
So now you can easily query things like, get a list of all cars and colours
SELECT CAR, COLOUR
FROM CARS CA,
COLOUR COL,
CAR_COLOUR CACOL
WHERE CA.CAR=CACOL.CAR
AND CACOL.COL=COL.COLOUR
OR if you just want the white cars, add the following to the WHERE clause
AND COL.COLOUR='White'
an index on the id fields and on both fields in CAR_COLOUR will mean you get great performance even if you have thousands of rows whereas putting them all in a comma separated list in a single field will mean you have to use substr or like which would prevent the use of indexes and mean as the amount of data grows, the performance will degrade rapidly.

Storing relations in the coma-separated list makes sense in some senses. You don't need commas though. There are 2 existing controls which can help you with that.
Displaying list of values with checkboxes in a form:
$form->addField('CheckboxList','corvette')->setValueList($array);
(you can populate array through $model->getRows() although I think it needs to be associative. You can probably join them with var_dump and foreach).
Your other options is to use a hidden field with selectable grid.
$field = $form->addField('line','selection');
$grid = $form->add('MVCGrid');
$grid->setModel('Colors',array('name'));
$grid->addSelectable($field);
$form->addSubmit();
To hide the actual field, you can either use "hidden" instead of "line" or use JavaScript to hide it:
$field->js(true)->hide();
or
$field->js(true)->closest('dl')->hide();
if you need to hide markup around the field too.

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