Subscribe between fields In sql - mysql

Question

i have a table with these fields
id,cid,cv
with these data
1,5,code
2,3,code4
3,3,cod2
1,4,code5
1,3,code4
] want select id what cid=5 and cv=code and cid=3 or 4 and cv=code4.
I expect that id=1.
I used this query,but result is 0
SELECT id FROM table WHERE (cid='5' and cv='code') and (cid in ('3','4') and cv='code4')
sorry for bad english.

Answer 1

SELECT id FROM my_table
WHERE (cid=5 and cv='code')
or ((cid = 3 and cv='code4')
and (cid = 4 and cv='code4'))
group by id
SQL Fiddle Example

Answer 2

Try this (change the AND between the parenteses to OR):
SELECT id
FROM table
WHERE (cid='5' and cv='code') OR (cid in ('3','4') and cv='code4')

Answer 3

You should try using ORs instead of ANDs
SELECT id
FROM table
WHERE (cid='5' and cv='code')
OR (cid in ('3','4') and cv='code4')

Answer 4

I put this at http://sqlfiddle.com/#!2/40054/51 (you can tell by the last number being 51 I took some wrong turns). I think this is called "Key Value," I proposed an edit to the tags for this post, but I think you should re-tag it to include key-value. Anyway: databases like this are difficult to query compared to approaches where one row refers to one thing - instead you have one row referring to one attribute. So if you want to know something about what "things" have certain attributes, you have to paste the attributes for each thing together in one row. Run the query below and you'll see what I mean:
SELECT laptops.laptop, rams.termvalue as ramCount,
cpus.termvalue as cpusCount,
maker.termvalue as company
FROM (SELECT DISTINCT laptop FROM my_table) As Laptops
LEFT JOIN (SELECT laptop, termvalue FROM my_table
WHERE term = 'ram') AS rams
ON rams.laptop = laptops.laptop
LEFT JOIN (SELECT laptop, termvalue FROM my_table
WHERE term = 'cpu') AS cpus
ON cpus.laptop = laptops.laptop
LEFT JOIN (SELECT laptop, termvalue FROM my_table
WHERE term = 'company') AS maker
ON maker.laptop = laptops.laptop
If you put up other questions about this type of database, you should always mention that you're using a "key/value" arrangement, it's uncommon and not what any of us assumed.
In your fiddler example you wanted to find company = dell and cpu = 2 or ram = 2, so you would query that whole query by wrapping it in parentheses and giving it an alias, like this:
SELECT * FROM (
SELECT laptops.laptop, rams.termvalue as ramCount,
cpus.termvalue as cpusCount,
maker.termvalue as company
FROM (SELECT DISTINCT laptop FROM my_table) As Laptops
LEFT JOIN (SELECT laptop, termvalue FROM my_table
WHERE term = 'ram') AS rams
ON rams.laptop = laptops.laptop
LEFT JOIN (SELECT laptop, termvalue FROM my_table
WHERE term = 'cpu') AS cpus
ON cpus.laptop = laptops.laptop
LEFT JOIN (SELECT laptop, termvalue FROM my_table
WHERE term = 'company') AS maker
ON maker.laptop = laptops.laptop
) as laps
WHERE company = 'dell' AND (cpuscount = 2 OR ramcount = 2)