选择所有列数据但列上不同

Question

SELECT * DISTINCT `contact_id`  
 FROM `survey_response_single`  
  WHERE text_id = '1' LIMIT 0, 15 

i will want to fetch all columns data using distinct query

Answer 1

First of all, it looks like he wants to access all the columns. So while using DISTINCT, one has to specify all the columns but as you can't use *

But if we use GROUP BY, this problem could be solved. As in GROUP BY you will get only distinct values of contact_id as similar values would be grouped. Moreover now we can access all columns using *

SELECT * FROM `survey_response_single`  
WHERE text_id = '1' 
GROUP BY `contact_id`

Answer 2

Try below of any depends on which output you want:

SELECT DISTINCT contact_id, text_id, details  -- take your column names
FROM survey_response_single  
WHERE text_id = '1' LIMIT 0, 15 

http://sqlfiddle.com/#!2/3d502/4

or this(if you want only single column's distinct values):

SELECT DISTINCT contact_id
FROM survey_response_single  
WHERE text_id = '1' LIMIT 0, 15 

http://sqlfiddle.com/#!2/3d502/6

Answer 3

Easy going:

SELECT DISTINCT `contact_id`, *
FROM `survey_response_single`
WHERE `text_id` = '1' LIMIT 0, 15

What many doesnt know: '*' doesnt have to be the only statement within a SELECT. You can easily seperate it by comma and fetch more columns.

You call DISTINCT on the target column and also fetch all other columns with star.

The only side-effect is that your result table will contain two "contact_id" columns with identical content. But you dont need to worry about an alias when fetching the array with PHP this will work either way.

If you want a query without duplicate data you have no choice but to list all columns of the table by yourself instead of using *

Answer 4

$query=mysql_query("SELECT DISTINCT `contact_id`,column1,
column2 FROM `survey_response_single`
WHERE text_id = '1' LIMIT 0, 15  "); //You select here the required data 
//of column1,2... and having distinct contact_id values
$execute_query=mysql_query($query,$db_conn);
while($row=mysql_fetch_array($execute_query){
  //use you data
}

Answer 5

SELECT DISTINCT `contact_id`  
 FROM `survey_response_single`  
  WHERE text_id = '1' LIMIT 0, 15 

Answer 6

star (*) is not require

SELECT  DISTINCT `contact_id`  
 FROM `survey_response_single`  
  WHERE text_id = '1' LIMIT 0, 15 

remove * sign