我有一个MySQL语句,我需要一点帮助。我拉正确的数据,但我只需要一些帮助,排除不需要的记录。如果候选剩余尝试等于0,我不想拉取该记录,但正如您所看到的,我正在使用子查询来生成候选人可能具有的提醒尝试次数。如何从查询中排除不需要的记录
有没有办法使用WHERE语句中的remaining_attempts字段来排除不需要的记录?
SELECT (
SELECT count(*) AS Number_Attempts_Used
FROM candidate_exam_record
WHERE candidate_exam_record.idcandidate_eligibilty = candidate_eligibilty.idcandidate_eligibilty
) AS remaining_attempts
, (
SELECT CASE WHEN count(*) > '0' THEN candidate_exam_record.idcandidate_eligibilty END
FROM candidate_exam_record
WHERE candidate_exam_record.idcandidate_eligibilty = candidate_eligibilty.idcandidate_eligibilty) AS EL_ID
FROM candidate_eligibilty
INNER JOIN candidate ON candidate_eligibilty.idcandidate = candidate.idcandidate
INNER JOIN exam ON candidate_eligibilty.exam_id = exam.exam_id
INNER JOIN jurisdiction ON exam.jurisdiction_id = jurisdiction.jurisdiction_id
WHERE jurisdiction.jurisdiction_id = 'xxxx'
AND candidate_eligibilty.eligibility_end_date >= '2013-02-19'
AND remaining_attempts > '0'
你需要这个计数吗(我的意思是你需要返回的数据中的remaining_attempts)? – 2013-02-19 22:29:42
没有必要返回remaining_attempts。 – 2013-02-19 22:38:24