How to get result properly from MySQL table - php

Question

This is my product table
and I want to get all product where product_sizes in (Xl, M)
I am trying into this code
SELECT `id`,`name`,`sell_price`,`product_sizes`,`product_colors`
FROM `view_product_listing`
WHERE `product_sizes` in ('XL', 'M')
return to me productId 15 and 16 but I want to productId 4,14,15,16

Answer 1

You should seriously avoid storing the sizes as CSV (comma separated) data, see below for an alternative table design. As a workaround, we can use FIND_IN_SET:
SELECT id, name, sell_price, product_sizes, product_colors
FROM view_product_listing
WHERE FIND_IN_SET('M', product_sizes) > 0 OR FIND_IN_SET('XL', product_sizes) > 0;
But note that a much better database design would be to have a separate table for products, sizes, and colors: (colors omitted)
products
id | name | sell_price |
4 | Women Maxi White Dress | 550.00 |
14 | Women Maxi Blue Dress | 700.00 |
15 | Women Fit and Flare Multicolor Dress | 750.00 |
16 | Floral Print Straight Kurta | 699.00 |
sizes
product_id | product_size
4 | XL
4 | M
14 | XL
14 | XXL
14 | L
14 | M
15 | XL
16 | M
Now we can use a straightforward join to find all products, and their metadata, which have either the medium or XL size:
SELECT
p.id,
p.name,
p.sell_price,
s.product_size
FROM products p
INNER JOIN sizes s
ON p.id = s.product_id
WHERE
s.product_size IN ('M', 'XL');

Answer 2

use find_in_set()
SELECT `id`,`name`,`sell_price`,`product_sizes`,`product_colors`
FROM `view_product_listing`
WHERE FIND_IN_SET(product_sizes,'XL,M')

Answer 3

If you are only searching for one size you could use the built-in MySQL function FIND_IN_SET()
SELECT `id`,`name`,`sell_price`,`product_sizes`,`product_colors`
FROM `view_product_listing`
WHERE FIND_IN_SET('XL', product_sizes)
However it only supports a single string (unless you add additional OR's, but that quickly becomes tedious).
The best approach would be to restructure your database so that the product sizes of items are in a seperate table with a reference to the item table and a size table.
That way you don't have to update your queries whenever you want to introduce new sizes and it will improve performance for your query.
A word of warning,
Do not attempt a LIKE clause, because search for LIKE '%XL%' will also match XXL

Answer 4

You can use FIND_IN_SET like this,
Version 1:
SELECT `id`,`name`,`sell_price`,`product_sizes`,`product_colors`
FROM `view_product_listing`
WHERE FIND_IN_SET('XL',product_sizes) OR FIND_IN_SET('M',product_sizes)
EDIT 1
There is one more approach to achieve this,
Version 2:
SELECT `id`,`name`,`sell_price`,`product_sizes`,`product_colors`
FROM `view_product_listing`
WHERE CONCAT(',',product_sizes,',') REGEXP ",(XL|M),"
Source link for second version.
EDIT 2
You product_sizes is having spaces after commas, which is not the behaviour find_in_set is expecting. To trim all spaces from that column,
UPDATE `table` SET `product_sizes` = REPLACE(`product_sizes`, ' ', '')
And now run any version query you want to try, it will work.