'Mysql Complex Where Clause

I really surprised when I tried below code in MySQL:

SELECT * FROM table 
  WHERE (key='free_shipping' and value='yes') 
  AND (key='price' and value='5')

It doesn't work. I need to get product that is both free_shipping is 'yes' AND price equal '5' at the same time. How can I create this query properly?

Table Structure:

contents: (TABLE 1)

CONTENT_ID   TITLE  DESCRIPTION  DATE

content_fields: (TABLE 2)

FIELD_ID   CONTENT_ID    KEY_NAME    VALUE

Example (Get product that has 1 ID and its shipping is FREE):

SELECT *  FROM `contents` as c LEFT JOIN `content_fields` as cf ON  c.content_id = cf.content_id WHERE c.content_id = 1 AND  cf.key_name = 'free_shipping' AND cf.value = 'yes'
sqlmysqldatabase


Solution 1:[1]

Try this:

WHERE free_shipping='yes' AND price='5'

or:

WHERE free_shipping=yes AND price=5

if the fields aren't strings

Solution 2:[2]

The brackets don't change the meaning of this statement. Without them you have:

key='free_shipping' and value='yes' and key='price' and value='5'
=>
key='free_shipping' and key='price'
=>
nothing!

try WHERE free_shipping='yes' AND price='5'

edit: scrap that, I'm now completely confused by your table. Is it just a load of key/value pairs? Could we see the table structure?

Solution 3:[3]

To get product titles that have free shipping and worth 5....... select distinct x.TITLE from contents x, content_fields y, content_fields z where x.CONTENT_ID = y.CONTENT_ID and y.CONTENT_ID = z.CONTENT_ID and y.key_name = 'free_shipping' and y.value='yes' and z.key_name = 'price' and z.value='5'

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Andrew Cooper
Solution 2 fredley
Solution 3 shubhn

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