如何在mysql中限制使用group by
[英]How to limit using group by in mysql
問題描述
我有一個很大的問題。 我不知道如何限制分組依據。 下面有12套學生。 我想限制為10組學生。 我想刪除底部的最后2個。 當我嘗試使用10的限制時，它僅返回10行。 我嘗試了搜索，並嘗試了以下代碼：
SELECT
VSG.STUDENT_ID
, VSG.SCHOOL_YEAR_ID
, VSG.LEVEL_ID
, VSG.FNAME
, VSG.LNAME
, VSG.MNAME
, VSG.SUBJECT
, VSG.GRADE
,
(SELECT AVG(VSG.GRADE) FROM V_STUDENT_GRADES
WHERE STUDENT_ID = VSG.STUDENT_ID
) AS AVG_GRADE
FROM V_STUDENT_GRADES VSG
JOIN
(
SELECT * FROM
(
SELECT STUDENT_ID, AVG(GRADE) AS AVG_GRADE FROM
V_STUDENT_GRADES GROUP BY STUDENT_ID
) SG
ORDER BY AVG_GRADE DESC LIMIT 10
) VG ON VG.STUDENT_ID=VSG.STUDENT_ID
WHERE SCHOOL_YEAR_ID = 2
AND LEVEL_ID = 7
AND PERIOD_ID =1
AND SUBJECT_ID=SUBJECT_ID
GROUP BY STUDENT_ID, SUBJECT
ORDER BY AVG_GRADE DESC, SUBJECT ASC;
我有錯誤：
Error Code: 1242. Subquery returns more than 1 row
下表是12套學生的表格。 我要刪除具有STUDENT_ID和46和8的學生。
請幫忙。 謝謝。
+------------+----------------+----------+-----------+------------------------+-------------+--------------------+-------------+-------+-------------------+ | STUDENT_ID | SCHOOL_YEAR_ID | LEVEL_ID | PERIOD_ID | FNAME | LNAME | MNAME | SUBJECT | GRADE | AVG_GRADE | +------------+----------------+----------+-----------+------------------------+-------------+--------------------+-------------+-------+-------------------+ | 4 | 2 | 7 | 1 | ASD | QWERTY | ZXC | math 100 | 97 | 90.66666666666667 | | 4 | 2 | 7 | 1 | ASD | QWERTY | ZXC | CRIM 111 | 85 | 90.66666666666667 | | 4 | 2 | 7 | 1 | ASD | QWERTY | ZXC | BIOLOGY | 98 | 90.66666666666667 | | 4 | 2 | 7 | 1 | ASD | QWERTY | ZXC | ELECTIVE 1 | 95 | 90.66666666666667 | | 4 | 2 | 7 | 1 | ASD | QWERTY | ZXC | CIVIL 111 | 78 | 90.66666666666667 | | 4 | 2 | 7 | 1 | ASD | QWERTY | ZXC | ENGLISH 222 | 96 | 90.66666666666667 | | 4 | 2 | 7 | 1 | ASD | QWERTY | ZXC | COMPUTER | 82 | 90.66666666666667 | | 4 | 2 | 7 | 1 | ASD | QWERTY | ZXC | MAPEH | 92 | 90.66666666666667 | | 4 | 2 | 7 | 1 | ASD | QWERTY | ZXC | CONSTI 222 | 93 | 90.66666666666667 | | 34 | 2 | 7 | 1 | Edeline | Teh | S | MAPEH | 95 | 90 | | 34 | 2 | 7 | 1 | Edeline | Teh | S | CONSTI 222 | 84 | 90 | | 34 | 2 | 7 | 1 | Edeline | Teh | S | math 100 | 97 | 90 | | 34 | 2 | 7 | 1 | Edeline | Teh | S | CRIM 111 | 87 | 90 | | 34 | 2 | 7 | 1 | Edeline | Teh | S | BIOLOGY | 90 | 90 | | 34 | 2 | 7 | 1 | Edeline | Teh | S | ELECTIVE 1 | 93 | 90 | | 34 | 2 | 7 | 1 | Edeline | Teh | S | CIVIL 111 | 84 | 90 | | 34 | 2 | 7 | 1 | Edeline | Teh | S | ENGLISH 222 | 98 | 90 | | 34 | 2 | 7 | 1 | Edeline | Teh | S | COMPUTER | 82 | 90 | | 31 | 2 | 7 | 1 | John Farid | Macaludos | s | math 100 | 74 | 89.55555555555556 | | 31 | 2 | 7 | 1 | John Farid | Macaludos | s | CRIM 111 | 89 | 89.55555555555556 | | 31 | 2 | 7 | 1 | John Farid | Macaludos | s | BIOLOGY | 89 | 89.55555555555556 | | 31 | 2 | 7 | 1 | John Farid | Macaludos | s | ELECTIVE 1 | 96 | 89.55555555555556 | | 31 | 2 | 7 | 1 | John Farid | Macaludos | s | CIVIL 111 | 95 | 89.55555555555556 | | 31 | 2 | 7 | 1 | John Farid | Macaludos | s | ENGLISH 222 | 98 | 89.55555555555556 | | 31 | 2 | 7 | 1 | John Farid | Macaludos | s | COMPUTER | 87 | 89.55555555555556 | | 31 | 2 | 7 | 1 | John Farid | Macaludos | s | MAPEH | 96 | 89.55555555555556 | | 31 | 2 | 7 | 1 | John Farid | Macaludos | s | CONSTI 222 | 82 | 89.55555555555556 | | 15 | 2 | 7 | 1 | Dealson | Bagorio | S | MAPEH | 98 | 88.77777777777777 | | 15 | 2 | 7 | 1 | Dealson | Bagorio | S | CONSTI 222 | 83 | 88.77777777777777 | | 15 | 2 | 7 | 1 | Dealson | Bagorio | S | math 100 | 80 | 88.77777777777777 | | 15 | 2 | 7 | 1 | Dealson | Bagorio | S | CRIM 111 | 99 | 88.77777777777777 | | 15 | 2 | 7 | 1 | Dealson | Bagorio | S | BIOLOGY | 98 | 88.77777777777777 | | 15 | 2 | 7 | 1 | Dealson | Bagorio | S | ELECTIVE 1 | 96 | 88.77777777777777 | | 15 | 2 | 7 | 1 | Dealson | Bagorio | S | CIVIL 111 | 96 | 88.77777777777777 | | 15 | 2 | 7 | 1 | Dealson | Bagorio | S | ENGLISH 222 | 75 | 88.77777777777777 | | 15 | 2 | 7 | 1 | Dealson | Bagorio | S | COMPUTER | 74 | 88.77777777777777 | | 6 | 2 | 7 | 1 | Gintoki | Sakata | G | CIVIL 111 | 71 | 88.55555555555556 | | 6 | 2 | 7 | 1 | Gintoki | Sakata | G | ENGLISH 222 | 98 | 88.55555555555556 | | 6 | 2 | 7 | 1 | Gintoki | Sakata | G | COMPUTER | 74 | 88.55555555555556 | | 6 | 2 | 7 | 1 | Gintoki | Sakata | G | MAPEH | 92 | 88.55555555555556 | | 6 | 2 | 7 | 1 | Gintoki | Sakata | G | CONSTI 222 | 95 | 88.55555555555556 | | 6 | 2 | 7 | 1 | Gintoki | Sakata | G | math 100 | 99 | 88.55555555555556 | | 6 | 2 | 7 | 1 | Gintoki | Sakata | G | CRIM 111 | 85 | 88.55555555555556 | | 6 | 2 | 7 | 1 | Gintoki | Sakata | G | BIOLOGY | 98 | 88.55555555555556 | | 6 | 2 | 7 | 1 | Gintoki | Sakata | G | ELECTIVE 1 | 85 | 88.55555555555556 | | 7 | 2 | 7 | 1 | OfficeDump | SuperSchool | AccountsReceivable | ELECTIVE 1 | 84 | 88.33333333333333 | | 7 | 2 | 7 | 1 | OfficeDump | SuperSchool | AccountsReceivable | CIVIL 111 | 73 | 88.33333333333333 | | 7 | 2 | 7 | 1 | OfficeDump | SuperSchool | AccountsReceivable | ENGLISH 222 | 98 | 88.33333333333333 | | 7 | 2 | 7 | 1 | OfficeDump | SuperSchool | AccountsReceivable | COMPUTER | 72 | 88.33333333333333 | | 7 | 2 | 7 | 1 | OfficeDump | SuperSchool | AccountsReceivable | MAPEH | 93 | 88.33333333333333 | | 7 | 2 | 7 | 1 | OfficeDump | SuperSchool | AccountsReceivable | CONSTI 222 | 92 | 88.33333333333333 | | 7 | 2 | 7 | 1 | OfficeDump | SuperSchool | AccountsReceivable | math 100 | 98 | 88.33333333333333 | | 7 | 2 | 7 | 1 | OfficeDump | SuperSchool | AccountsReceivable | CRIM 111 | 98 | 88.33333333333333 | | 7 | 2 | 7 | 1 | OfficeDump | SuperSchool | AccountsReceivable | BIOLOGY | 87 | 88.33333333333333 | | 21 | 2 | 7 | 1 | Nivea | Gegone | M | CRIM 111 | 87 | 88.22222222222223 | | 21 | 2 | 7 | 1 | Nivea | Gegone | M | BIOLOGY | 89 | 88.22222222222223 | | 21 | 2 | 7 | 1 | Nivea | Gegone | M | ELECTIVE 1 | 98 | 88.22222222222223 | | 21 | 2 | 7 | 1 | Nivea | Gegone | M | CIVIL 111 | 95 | 88.22222222222223 | | 21 | 2 | 7 | 1 | Nivea | Gegone | M | ENGLISH 222 | 98 | 88.22222222222223 | | 21 | 2 | 7 | 1 | Nivea | Gegone | M | COMPUTER | 72 | 88.22222222222223 | | 21 | 2 | 7 | 1 | Nivea | Gegone | M | MAPEH | 98 | 88.22222222222223 | | 21 | 2 | 7 | 1 | Nivea | Gegone | M | CONSTI 222 | 82 | 88.22222222222223 | | 21 | 2 | 7 | 1 | Nivea | Gegone | M | math 100 | 75 | 88.22222222222223 | | 13 | 2 | 7 | 1 | Jasima | Alonto | D | ENGLISH 222 | 82 | 87.55555555555556 | | 13 | 2 | 7 | 1 | Jasima | Alonto | D | COMPUTER | 83 | 87.55555555555556 | | 13 | 2 | 7 | 1 | Jasima | Alonto | D | MAPEH | 98 | 87.55555555555556 | | 13 | 2 | 7 | 1 | Jasima | Alonto | D | CONSTI 222 | 94 | 87.55555555555556 | | 13 | 2 | 7 | 1 | Jasima | Alonto | D | math 100 | 100 | 87.55555555555556 | | 13 | 2 | 7 | 1 | Jasima | Alonto | D | CRIM 111 | 72 | 87.55555555555556 | | 13 | 2 | 7 | 1 | Jasima | Alonto | D | BIOLOGY | 87 | 87.55555555555556 | | 13 | 2 | 7 | 1 | Jasima | Alonto | D | ELECTIVE 1 | 79 | 87.55555555555556 | | 13 | 2 | 7 | 1 | Jasima | Alonto | D | CIVIL 111 | 93 | 87.55555555555556 | | 12 | 2 | 7 | 1 | Roderick | Almero | A | MAPEH | 92 | 87.22222222222223 | | 12 | 2 | 7 | 1 | Roderick | Almero | A | CONSTI 222 | 96 | 87.22222222222223 | | 12 | 2 | 7 | 1 | Roderick | Almero | A | math 100 | 100 | 87.22222222222223 | | 12 | 2 | 7 | 1 | Roderick | Almero | A | CRIM 111 | 79 | 87.22222222222223 | | 12 | 2 | 7 | 1 | Roderick | Almero | A | BIOLOGY | 87 | 87.22222222222223 | | 12 | 2 | 7 | 1 | Roderick | Almero | A | ELECTIVE 1 | 74 | 87.22222222222223 | | 12 | 2 | 7 | 1 | Roderick | Almero | A | CIVIL 111 | 75 | 87.22222222222223 | | 12 | 2 | 7 | 1 | Roderick | Almero | A | ENGLISH 222 | 100 | 87.22222222222223 | | 12 | 2 | 7 | 1 | Roderick | Almero | A | COMPUTER | 82 | 87.22222222222223 | | 10 | 2 | 7 | 1 | MA. LOURDES ANTOINNETE | THREE ROSES | DE ASIS | BIOLOGY | 78 | 86.88888888888889 | | 10 | 2 | 7 | 1 | MA. LOURDES ANTOINNETE | THREE ROSES | DE ASIS | ELECTIVE 1 | 92 | 86.88888888888889 | | 10 | 2 | 7 | 1 | MA. LOURDES ANTOINNETE | THREE ROSES | DE ASIS | CIVIL 111 | 94 | 86.88888888888889 | | 10 | 2 | 7 | 1 | MA. LOURDES ANTOINNETE | THREE ROSES | DE ASIS | ENGLISH 222 | 97 | 86.88888888888889 | | 10 | 2 | 7 | 1 | MA. LOURDES ANTOINNETE | THREE ROSES | DE ASIS | COMPUTER | 75 | 86.88888888888889 | | 10 | 2 | 7 | 1 | MA. LOURDES ANTOINNETE | THREE ROSES | DE ASIS | MAPEH | 96 | 86.88888888888889 | | 10 | 2 | 7 | 1 | MA. LOURDES ANTOINNETE | THREE ROSES | DE ASIS | CONSTI 222 | 83 | 86.88888888888889 | | 10 | 2 | 7 | 1 | MA. LOURDES ANTOINNETE | THREE ROSES | DE ASIS | math 100 | 84 | 86.88888888888889 | | 10 | 2 | 7 | 1 | MA. LOURDES ANTOINNETE | THREE ROSES | DE ASIS | CRIM 111 | 83 | 86.88888888888889 | | 46 | 2 | 7 | 1 | Archi | Masa | A | ENGLISH 222 | 81 | 86.22222222222223 | | 46 | 2 | 7 | 1 | Archi | Masa | A | COMPUTER | 82 | 86.22222222222223 | | 46 | 2 | 7 | 1 | Archi | Masa | A | MAPEH | 99 | 86.22222222222223 | | 46 | 2 | 7 | 1 | Archi | Masa | A | CONSTI 222 | 92 | 86.22222222222223 | | 46 | 2 | 7 | 1 | Archi | Masa | A | math 100 | 100 | 86.22222222222223 | | 46 | 2 | 7 | 1 | Archi | Masa | A | CRIM 111 | 75 | 86.22222222222223 | | 46 | 2 | 7 | 1 | Archi | Masa | A | BIOLOGY | 86 | 86.22222222222223 | | 46 | 2 | 7 | 1 | Archi | Masa | A | ELECTIVE 1 | 76 | 86.22222222222223 | | 46 | 2 | 7 | 1 | Archi | Masa | A | CIVIL 111 | 85 | 86.22222222222223 | | 8 | 2 | 7 | 1 | FN | LN | MN | CONSTI 222 | 94 | 82.88888888888889 | | 8 | 2 | 7 | 1 | FN | LN | MN | math 100 | 100 | 82.88888888888889 | | 8 | 2 | 7 | 1 | FN | LN | MN | CRIM 111 | 78 | 82.88888888888889 | | 8 | 2 | 7 | 1 | FN | LN | MN | BIOLOGY | 78 | 82.88888888888889 | | 8 | 2 | 7 | 1 | FN | LN | MN | ELECTIVE 1 | 82 | 82.88888888888889 | | 8 | 2 | 7 | 1 | FN | LN | MN | CIVIL 111 | 76 | 82.88888888888889 | | 8 | 2 | 7 | 1 | FN | LN | MN | ENGLISH 222 | 65 | 82.88888888888889 | | 8 | 2 | 7 | 1 | FN | LN | MN | COMPUTER | 79 | 82.88888888888889 | | 8 | 2 | 7 | 1 | FN | LN | MN | MAPEH | 94 | 82.88888888888889 | +------------+----------------+----------+-----------+------------------------+-------------+--------------------+-------------+-------+-------------------+
1 個解決方案
解決方案1
0 2014-10-30 09:12:49
試試這個。
...... GROUP BY STUDENT_ID IN（從TableName LIMIT 10中選擇DISTINCT STUDENT_ID），SUBJECT ORDER BY AVG_GRADE DESC，SUBJECT ASC；
我認為這會對您有所幫助。
MYSQL在分組依據中使用限制
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