MySQL查询计数选票

Question

I have a table with the following columns: user_id, key, value, and flag. The SELECT, FROM, WHERE, GROUP BY and ORDER BY work by themselves as expected. It's when I try to add the key to the table, I get an errors that says to check my syntax. The key is the question and the value are the answers. I want a result that shows all the questions with all possible answers and a count of how often that answer occurred.

SELECT value AS 'Answer', count(*) AS 'Total Votes'
FROM survey_data sd
INNER JOIN (SELECT key FROM sd GROUP BY key) T1 ON T1.key = sd.key
WHERE flag != 1
GROUP BY value
ORDER BY 'Total Votes' DESC

What am I missing here?

As a side note, when I run this query without the INNER JOIN, the result is not ordered DESC by 'Total Votes' -- does anyone know why or what the problem might be?

Thanks, Ryan

Answer 1

key is a reserved word.

http://dev.mysql.com/doc/refman/5.5/en/reserved-words.html

put it within backticks (alt+96) or rename your field

edit. If you use an alias with more than one word you have to use backtick too. So change your order by clause in

order by total votes desc without quotes

Put backtick before and after total votes. I don't see them in my post or even better change your field alias with a single word.

Answer 2

Im an MSSQL guy so not sure if this will help, but try use fully qualified columns eg. table.column

SELECT sd.value AS 'Answer', count(sd.*) AS 'Total Votes'
FROM survey_data sd
INNER JOIN (SELECT sd.key FROM sd GROUP BY sd.key) T1 ON T1.key = sd.key
WHERE sd.flag != 1
GROUP BY sd.value
ORDER BY 'Total Votes' DESC