Hi Everyone,
I'm trying to perform a query on some responses I have stored. I want to be
able to add up a score (using SUM() ) but first checking that all the
questions have been answered.
I've tried
SELECT *
FROM `questions`
LEFT JOIN `responses`
ON `questions`.`qi d` = `responses`.`qi d`
AND `responses`.`ye arid` = 1 AND `responses`.`ui d` = 1
WHERE `value` = NULL OR '-1'
ORDER BY value DESC
but it only returns all the rows even if value is '1' those question
a entry for a question is created with a `value` value of -1 when it is
accessed.
In short, I need to be able to identify those question which either don't
have an entry in `responses` for them or have an entry set to `-1`
RESPONSES
+-------+---------+
| Field | Type |
+-------+---------+
| uid | int(11) |
| yearid | int(11) |
| qid | int(11) |
| value | int(1) |
+-------+---------+
QUESTIONS
+----------+--------------+
| Field | Type |
+----------+--------------+
| qid | int(11) |
| qtext | varchar(100) |
+----------+--------------+
This is really bugging me. I can seem to make sense of it in my head, but
not able to translate it to SQL
Hope someone can help,
Cheers,
Greg 2 1836
"The Wanderer" <no************ ***@spamdial.pi pex.com> wrote in message
news:bg******** **@newsg2.svr.p ol.co.uk... Hi Everyone,
I'm trying to perform a query on some responses I have stored. I want to
be able to add up a score (using SUM() ) but first checking that all the questions have been answered.
I've tried SELECT * FROM `questions` LEFT JOIN `responses` ON `questions`.`qi d` = `responses`.`qi d` AND `responses`.`ye arid` = 1 AND `responses`.`ui d` = 1 WHERE `value` = NULL OR '-1' ORDER BY value DESC
but it only returns all the rows even if value is '1' those question
a entry for a question is created with a `value` value of -1 when it is accessed.
In short, I need to be able to identify those question which either don't have an entry in `responses` for them or have an entry set to `-1`
RESPONSES +-------+---------+ | Field | Type | +-------+---------+ | uid | int(11) | | yearid | int(11) | | qid | int(11) | | value | int(1) | +-------+---------+
QUESTIONS +----------+--------------+ | Field | Type | +----------+--------------+ | qid | int(11) | | qtext | varchar(100) | +----------+--------------+
[snip]
I've come a little further with
SELECT *
FROM questions AS q
LEFT JOIN responses AS r1 ON q.qid = r1.qid
JOIN responses AS r2 ON r1.uid = 1 AND r1.uid = r2.uid AND r1.qid = r2.qid
AND r1.yearid = 1 AND r1.yearid = r2.masid
WHERE r1.value IS NULL OR r1.value = '-1'
but because of the join it only returns those values which have -1 in them,
not those with NULL.
I feel like I'm so close, maybe I just need one extra word or condition and
it'll all fall into place.
Greg
"The Wanderer" <no************ ***@spamdial.pi pex.com> wrote in message
news:bg******** **@newsg2.svr.p ol.co.uk... Hi Everyone,
I'm trying to perform a query on some responses I have stored. I want to
be able to add up a score (using SUM() ) but first checking that all the questions have been answered.
I've tried SELECT * FROM `questions` LEFT JOIN `responses` ON `questions`.`qi d` = `responses`.`qi d` AND `responses`.`ye arid` = 1 AND `responses`.`ui d` = 1 WHERE `value` = NULL OR '-1' ORDER BY value DESC
but it only returns all the rows even if value is '1' those question
a entry for a question is created with a `value` value of -1 when it is accessed.
In short, I need to be able to identify those question which either don't have an entry in `responses` for them or have an entry set to `-1`
RESPONSES +-------+---------+ | Field | Type | +-------+---------+ | uid | int(11) | | yearid | int(11) | | qid | int(11) | | value | int(1) | +-------+---------+
QUESTIONS +----------+--------------+ | Field | Type | +----------+--------------+ | qid | int(11) | | qtext | varchar(100) | +----------+--------------+
[snip]
I've come a little further with
SELECT *
FROM questions AS q
LEFT JOIN responses AS r1 ON q.qid = r1.qid
JOIN responses AS r2 ON r1.uid = 1 AND r1.uid = r2.uid AND r1.qid = r2.qid
AND r1.yearid = 1 AND r1.yearid = r2.masid
WHERE r1.value IS NULL OR r1.value = '-1'
but because of the join it only returns those values which have -1 in them,
not those with NULL.
I feel like I'm so close, maybe I just need one extra word or condition and
it'll all fall into place.
Greg This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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