获取错误＃1221 - UNION和LIMIT的使用不正确

时间：2016-01-13 10:03:38

标签： mysql

我尝试在查询之间使用union对这两个查询进行联合查询，但是收到错误＃121 UNION和LIMIT的使用不正确。请帮我制作这个联合查询以获得这些查询的结果。

QUERY1：

SELECT t1.TraineeID,
       t2.attnDate,
       MIN(t1.attnTime) AS inTime,
       (CASE WHEN MIN(t1.attnTime) < MAX(t1.attnTime) THEN MAX(t1.attnTime) else '' end) AS outTime,
       (CASE WHEN t5.Slot ='1' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '1')THEN 'P' 
             WHEN t5.Slot ='2' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '2')THEN 'P'
             WHEN t5.Slot ='3' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '3')THEN 'P'
             WHEN t5.Slot ='4' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '4')THEN 'P'
             WHEN t5.Slot ='1' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '1')THEN 'Early Out' 
             WHEN t5.Slot ='2' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '2')THEN 'Early Out'
             WHEN t5.Slot ='3' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '3')THEN 'Early Out'
             WHEN t5.Slot ='4' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '4')THEN 'Early Out'
             ELSE 'Late-In'
       END) AS Status

FROM tbl_attn_temp t1, tbl_assigned t3, tbl_batch t5
JOIN (SELECT DISTINCT attnDate FROM tbl_attn_temp) t2
WHERE t1.attndate = t2.attnDate and t3.BatchID=t5.BatchID AND t1.TraineeID = t3.TraineeID
AND t1.attnDate='2016-01-13'
AND(CASE WHEN t5.Slot ='1' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '1') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '1') 
         WHEN t5.Slot ='2' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '2') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '2')
         WHEN t5.Slot ='3' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '3') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '3')
         WHEN t5.Slot ='4' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '4') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '4')
    END)
GROUP BY t1.TraineeID, t2.attnDate

QUERY2：

SELECT t1.TraineeID,
       t2.attnDate,
       MIN(t1.attnTime) AS inTime,
              (CASE WHEN MIN(t1.attnTime) < MAX(t1.attnTime) THEN MAX(t1.attnTime) else '' end) AS outTime,
       (CASE WHEN t4.Slot ='1' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '1')THEN 'P' 
             WHEN t4.Slot ='2' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '2')THEN 'P'
             WHEN t4.Slot ='3' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '3')THEN 'P'
             WHEN t4.Slot ='4' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '4')THEN 'P'
             WHEN t4.Slot ='1' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '1')THEN 'Early Out' 
             WHEN t4.Slot ='2' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '2')THEN 'Early Out'
             WHEN t4.Slot ='3' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '3')THEN 'Early Out'
             WHEN t4.Slot ='4' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '4')THEN 'Early Out'
             ELSE 'Late-In'
       END) AS Status

FROM tbl_attn_temp t1, tbl_assigned t3, tbl_instructor_info t4
JOIN (SELECT DISTINCT attnDate FROM tbl_attn_temp) t2
WHERE t1.attndate = t2.attnDate AND t1.TraineeID = t4.InstructorID
AND t1.attnDate='2016-01-13'
AND(CASE WHEN t4.Slot ='1' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '1') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '1') 
         WHEN t4.Slot ='2' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '2') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '2')
         WHEN t4.Slot ='3' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '3') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '3')
         WHEN t4.Slot ='4' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '4') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '4')
    END)
GROUP BY t1.TraineeID, t2.attnDate

3 个答案:

答案 0 :(得分：12)

只需在这些联合语句中添加括号即可。它对我有用，例如： （选择...限制1） 联盟 （选择...限制1） 联盟 （选择...限制1）

将所有括号括起来。

答案 1 :(得分：0)

它是由MySQL 5.7的变化引起的。要解决这个问题，你必须'＆＃34; nest＆＃34;你的选择，如下：

SELECT * FROM(

    SELECT t1.TraineeID,
           t2.attnDate,
           MIN(t1.attnTime) AS inTime,
           (CASE WHEN MIN(t1.attnTime) < MAX(t1.attnTime) THEN MAX(t1.attnTime) else '' end) AS outTime,
           (CASE WHEN t5.Slot ='1' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '1')THEN 'P' 
                 WHEN t5.Slot ='2' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '2')THEN 'P'
                 WHEN t5.Slot ='3' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '3')THEN 'P'
                 WHEN t5.Slot ='4' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '4')THEN 'P'
                 WHEN t5.Slot ='1' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '1')THEN 'Early Out' 
                 WHEN t5.Slot ='2' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '2')THEN 'Early Out'
                 WHEN t5.Slot ='3' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '3')THEN 'Early Out'
                 WHEN t5.Slot ='4' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '4')THEN 'Early Out'
                 ELSE 'Late-In'
           END) AS Status

    FROM tbl_attn_temp t1, tbl_assigned t3, tbl_batch t5
    JOIN (SELECT DISTINCT attnDate FROM tbl_attn_temp) t2
    WHERE t1.attndate = t2.attnDate and t3.BatchID=t5.BatchID AND t1.TraineeID = t3.TraineeID
    AND t1.attnDate='2016-01-13'
    AND(CASE WHEN t5.Slot ='1' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '1') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '1') 
             WHEN t5.Slot ='2' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '2') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '2')
             WHEN t5.Slot ='3' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '3') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '3')
             WHEN t5.Slot ='4' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '4') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '4')
        END)
    GROUP BY t1.TraineeID, t2.attnDate
) AS query1

UNION 

SELECT * FROM(
SELECT t1.TraineeID,
       t2.attnDate,
       MIN(t1.attnTime) AS inTime,
              (CASE WHEN MIN(t1.attnTime) < MAX(t1.attnTime) THEN MAX(t1.attnTime) else '' end) AS outTime,
       (CASE WHEN t4.Slot ='1' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '1')THEN 'P' 
             WHEN t4.Slot ='2' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '2')THEN 'P'
             WHEN t4.Slot ='3' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '3')THEN 'P'
             WHEN t4.Slot ='4' AND t1.attnTime<=(SELECT inTime FROM tbl_threshold WHERE id = '4')THEN 'P'
             WHEN t4.Slot ='1' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '1')THEN 'Early Out' 
             WHEN t4.Slot ='2' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '2')THEN 'Early Out'
             WHEN t4.Slot ='3' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '3')THEN 'Early Out'
             WHEN t4.Slot ='4' AND max(t1.attnTime)<(SELECT outTime FROM tbl_threshold WHERE id = '4')THEN 'Early Out'
             ELSE 'Late-In'
       END) AS Status

FROM tbl_attn_temp t1, tbl_assigned t3, tbl_instructor_info t4
JOIN (SELECT DISTINCT attnDate FROM tbl_attn_temp) t2
WHERE t1.attndate = t2.attnDate AND t1.TraineeID = t4.InstructorID
AND t1.attnDate='2016-01-13'
AND(CASE WHEN t4.Slot ='1' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '1') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '1') 
         WHEN t4.Slot ='2' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '2') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '2')
         WHEN t4.Slot ='3' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '3') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '3')
         WHEN t4.Slot ='4' THEN t1.attnTime BETWEEN(SELECT minLimit FROM tbl_threshold WHERE id = '4') AND (SELECT maxLimit FROM tbl_threshold WHERE id = '4')
    END)
GROUP BY t1.TraineeID, t2.attnDate
) as query2

答案 2 :(得分：-2)

尝试关键字union all而不是union

<强>尝试： 

select * from (query 1)
union all
(query 2)
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