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How to write a SQL request less?


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  #1  
Old December 22nd, 2012, 01:26 PM
Dimaz Dimaz is offline
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Question How to write a SQL request less?
Hello from Russia! I have a code like this:
sql Code:
Original - sql Code 
  1. SELECT `cabinet`.`name_test`, `answers`.`answer_id`, (
  2. SELECT `answer_id` FROM `answers` WHERE `user_id` = '353281' AND `answers`.`test_id` = `cabinet`.`test_id`
  3. ) AS answer_2 FROM `cabinet` INNER JOIN `answers`
  4.  WHERE `user_id` = '184918649' AND `friend_id` = '353281' AND `answers`.`test_id` = `cabinet`.`test_id`

How not to write twice: `answers`.`test_id` = `cabinet`.`test_id`?
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  #2  
Old December 22nd, 2012, 04:14 PM
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could you please do a SHOW CREATE TABLE for each table

also, in your own words, please, what is the query supposed to do or trying to do?
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  #3  
Old December 23rd, 2012, 03:15 AM
Dimaz Dimaz is offline
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Select from the table, responses of the first and second users. If the other user has not responded to one of the tests, in this case is written NULL.
Is it possible to write `answers`.`test_id` = `cabinet`.`test_id` once? My code queries the table twice. Is it possible to query a table only once?
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Old December 23rd, 2012, 04:37 AM
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Quote:
Originally Posted by Dimaz
Is it possible to query a table only once?
sure, but that depends on what you're trying to accomplish

i don't understand "first and second users"
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Old December 23rd, 2012, 04:58 AM
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For `user_id` = '184918649' and `user_id` = '353281', get a list of response IDs. Tests are the same.
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Old December 23rd, 2012, 06:24 AM
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Quote:
Originally Posted by Dimaz
For `user_id` = '184918649' and `user_id` = '353281', get a list of response IDs.

Code:
SELECT answer_id 
  FROM answers 
 WHERE user_id IN ( '184918649' , '353281' )
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Old December 23rd, 2012, 06:57 AM
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sql Code:
Original - sql Code 
  1. SELECT `cabinet`.`name_test`, `answers`.`answer_id`, `answers`.`answer_id` AS answer2
  2.  FROM `cabinet` INNER JOIN `answers` ON `answers`.`test_id` = `cabinet`.`test_id`
  3.  WHERE `user_id` IN('184918649' AND `friend_id` = '353281', '353281')

name_test answer_id answer2
Test1_______111_______111
Test2_______222_______222
I need this:
name_test answer_id answer2
Test1_______111_______NULL
Test2_______222_______211
Сondition for user1: `user_id` = '184918649' AND `friend_id` = '353281'
Сondition for user2: `user_id` = '353281'. friend_id need not.
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  #8  
Old December 23rd, 2012, 08:19 AM
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Quote:
Originally Posted by Dimaz
Code:
 WHERE `user_id` IN('184918649' AND `friend_id` = '353281', '353281')
that's clearly invalid sql

and you still need to explain what you're actually trying to do
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Old December 23rd, 2012, 08:50 AM
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See my first post. I want to do the same, but not to write twice `answers`.`test_id` = `cabinet`.`test_id`.
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