如何从sql表中提取值

Question

> ID    ProductID   OptionName  OptionValue             SKU
> 
> 1           709      Title      Como  test
> 2           709     Color          Cobalt test
> 3           709     Color          Crimson            RNA.331.02.MM1K
> 4           709     Title          Como G2            RNA.331.02.MM1K
> 7           709     Color          another color      test ipn
> 8           709     Title          another title      test ipn

From the above table i want the following

Select distinct OptionName from myTable where ProductID = 709 group by OptionValue

but sql server is giving error on the group by clause and dont know how can i have all the different values grouped to distinct OptionName?

or i just can not ?

the result i want is as follows

[0] => array

    [Color] => array
        [0] => Cobalt test
        [1] => Crimson
        [2] => another color
   [Title] => array
       [0] => Como test
       [1] => Como G2
       [2] => another title

Answer 1

You need to use an aggregate function on the fields (like FIRST(), LAST(), MAX(), AVG() ...) you are selecting when you have a GROUP BY-clause. Also, distinct is not necessary when you have GROUP BY. Can you explain what data you want to extract and not only post a faulty query?

EDIT :

SELECT OptionName, OptionValue FROM myTable WHERE ProductID = 709 ORDER BY OptionName ASC

Will produce this:

> OptionName    OptionValue             
> 
> Color          Cobalt test
> Color          Crimson                
> Color          another color   
> Title          Como   test    
> Title          Como G2
> Title          another title

Converting to arrays etc. is something you have to do in your application, not with SQL.

Answer 2

Here is one solution

Select OptionName from myTable where ProductID = 709 limit 1

why does group by have an underscore

Answer 3

Try it without the distinct and with the OptionValue in there

select OptionName
from myTable 
where ProductID = 709 
group by OptionName, OptionValue

Using the GROUP BY will give you the distinct combinations.

Answer 4

By using GROUP BY OptionValue you're saying this...
- Get all the records from my query as normal
- Group records up that have the same OptionValue
- Return only one record for each of those groups

In your case, you then try to return the OptionName. This is a problem because there are multiple OptionName's to display per group, but only one record to do so per group.

As has been said, the right Query depends on what you need, and I'm not 100% clear on that from what you have written. (Giving an example of the results you need, and how to get those results, would help.)

My guess is that you just want two records ( Color and Title ). If so you can do either of these...

SELECT DISTINCT OptionName FROM myTable WHERE ProductID = 709

SELECT OptionName FROM myTable WHERE ProductID = 709 GROUP BY OptionName