Mysql `索引（注意编号，重设计数）。。。换句话说，您需要仔细检查每个交付表所需的索引刚刚添加了索引，解释不再使用filesort（解释数据：）对大量行执行任何操作。遗憾的是，查询仍然需要同样长的时间。我已经为问题添加了最新的解释。。是的，在不知道表结构和索引的情
Mysql `索引（注意编号，重设计数）。。。换句话说，您需要仔细检查每个交付表所需的索引刚刚添加了索引，解释不再使用filesort（解释数据：）对大量行执行任何操作。遗憾的是，查询仍然需要同样长的时间。我已经为问题添加了最新的解释。。是的，在不知道表结构和索引的情,mysql,database-performance,query-performance,Mysql,Database Performance,Query Performance,`索引（注意编号，重设计数）。。。换句话说，您需要仔细检查每个交付表所需的索引刚刚添加了索引，解释不再使用filesort（解释数据：）对大量行执行任何操作。遗憾的是，查询仍然需要同样长的时间。我已经为问题添加了最新的解释。。是的，在不知道表结构和索引的情况下很难进一步改进..更新：通过按数量级删除组来加快查询速度MySQL的哪个版本？较新的版本在加入（选择…）方面做得更好；你需要这样的优化！ SELECT Concat(Concat(cust.first_name, ' '), cust.la
`索引（注意编号，重设计数）。。。换句话说，您需要仔细检查每个交付表所需的索引刚刚添加了索引，解释不再使用filesort（解释数据：）对大量行执行任何操作。遗憾的是，查询仍然需要同样长的时间。我已经为问题添加了最新的解释。。是的，在不知道表结构和索引的情况下很难进一步改进..更新：通过按数量级删除组来加快查询速度MySQL的哪个版本？较新的版本在加入（选择…）
方面做得更好；你需要这样的优化！
SELECT Concat(Concat(cust.first_name, ' '), cust.last_name) AS customerName,
TYPE.code AS transType,
ty1.nsfamount,
np.sumrebateamount,
trans.note_id AS note_id,
trans.createdate AS createdatestr,
n.totalamount,
n.currentfloat,
( ( n.costofborrowing * 100 ) / n.amounttolent ) AS fees,
n.amounttolent,
( 0 - ( trans.cashamount + trans.chequeamount
+ trans.debitamount
+ trans.preauthorizedamount ) ) AS paidamount,
sumpenaltyamount
FROM (SELECT *
FROM loan_transaction trans1
WHERE trans1.cashamount < 0
OR trans1.chequeamount < 0
OR trans1.debitamount < 0
OR trans1.preauthorizedamount < 0) trans
inner join customer cust
ON trans.customer_id = cust.customer_id
inner join (SELECT *
FROM lookuptransactiontypes ty
WHERE ty.code <> 'REB'
AND ty.code <> 'PN') TYPE
ON trans.transactiontype = TYPE.transactiontypesid
inner join note n
ON trans.note_id = n.note_id
inner join (SELECT note_id,
SUM(rebateamount) AS sumrebateamount
FROM note_payment np1
GROUP BY np1.note_id) np
ON trans.note_id = np.note_id
left join (SELECT note_id,
transactiontype,
( SUM(chequeamount) + SUM(cashamount)
+ SUM(debitamount) + SUM(preauthorizedamount) )AS
NSFamount
FROM (SELECT *
FROM loan_transaction trans4
WHERE trans4.cashamount > 0
OR trans4.chequeamount > 0
OR trans4.debitamount > 0
OR trans4.preauthorizedamount > 0)trans5
inner join (SELECT transactiontypesid
FROM lookuptransactiontypes ty2
WHERE ty2.code = 'NSF')type2
ON
trans5.transactiontype = type2.transactiontypesid
GROUP BY trans5.note_id) ty1
ON ty1.note_id = trans.refnum
left join (SELECT note_id AS noteid,
( SUM(tp.cashamount) + SUM(tp.chequeamount)
+ SUM(tp.debitamount)
+ SUM(tp.preauthorizedamount) ) AS sumpenaltyamount
FROM loan_transaction tp
inner join (SELECT transactiontypesid
FROM lookuptransactiontypes lp
WHERE lp.code = 'PN') lp
ON lp.transactiontypesid = tp.transactiontype
GROUP BY tp.note_id) p
ON p.noteid = trans.refnum
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived3> ALL 2241
1 PRIMARY <derived4> ALL 191441 Using join buffer
1 PRIMARY n eq_ref PK_NOTE PK_NOTE 8 np.note_id 1
1 PRIMARY <derived2> ALL 274992 Using where; Using join buffer
1 PRIMARY cust eq_ref PRIMARY_97 PRIMARY_97 8 trans.CUSTOMER_ID 1
1 PRIMARY <derived5> ALL 2803
1 PRIMARY <derived8> ALL 14755
8 DERIVED <derived9> ALL 2 Using temporary; Using filesort
8 DERIVED tp ref TRANSACTIONTYPE TRANSACTIONTYPE 9 lp.transactionTypesID 110 Using where
9 DERIVED lp ALL 2206 Using where
5 DERIVED <derived7> ALL 98 Using temporary; Using filesort
5 DERIVED <derived6> ALL 314705 Using where; Using join buffer
7 DERIVED ty2 ALL 2206 Using where
6 DERIVED trans4 ALL 664587 Using where
4 DERIVED np1 index note_payment_idx_id_rebateamount 16 193366 Using index
3 DERIVED ty ALL 2206 Using where
2 DERIVED trans1 ALL 664587 Using where
SELECT
CONCAT(cust.first_name, ' ', cust.last_name) AS customerName,
TYPE.code AS transType,
ty1.nsfamount,
SUM(np.rebateamount) as sumrebateamount,
trans.note_id AS note_id,
trans.createdate AS createdatestr,
n.totalamount,
n.currentfloat,
((n.costofborrowing * 100) / n.amounttolent) AS fees,
n.amounttolent,
(0 - (trans.cashamount + trans.chequeamount
+ trans.debitamount
+ trans.preauthorizedamount)) AS paidamount,
sumpenaltyamount
FROM loan_transaction trans
INNER JOIN customer cust ON trans.customer_id = cust.customer_id
INNER JOIN lookuptransactiontypes TYPE ON trans.transactiontype = TYPE.transactiontypesid
INNER JOIN note n ON trans.note_id = n.note_id
INNER JOIN note_payment np ON trans.note_id = np.note_id
LEFT JOIN (SELECT
note_id,
transactiontype,
(SUM(chequeamount) + SUM(cashamount)
+ SUM(debitamount) + SUM(preauthorizedamount)) AS
NSFamount
FROM loan_transaction trans4
INNER JOIN lookuptransactiontypes type2 ON trans4.transactiontype = type2.transactiontypesid
WHERE (trans4.cashamount > 0
OR trans4.chequeamount > 0
OR trans4.debitamount > 0
OR trans4.preauthorizedamount > 0) AND type2.code = 'NSF'
GROUP BY trans5.note_id) ty1
ON ty1.note_id = trans.refnum
LEFT JOIN (SELECT
note_id AS noteid,
(SUM(tp.cashamount) + SUM(tp.chequeamount)
+ SUM(tp.debitamount)
+ SUM(tp.preauthorizedamount)) AS sumpenaltyamount
FROM loan_transaction tp
INNER JOIN (SELECT transactiontypesid
FROM lookuptransactiontypes lp
WHERE lp.code = 'PN') lp
ON lp.transactiontypesid = tp.transactiontype
GROUP BY tp.note_id) p
ON p.noteid = trans.refnum
WHERE
(trans.cashamount < 0
OR trans.chequeamount < 0
OR trans.debitamount < 0
OR trans.preauthorizedamount < 0)
AND TYPE.code <> 'REB'
AND TYPE.code <> 'PN'
GROUP BY trans.note_id;
-- this will force a full scan on customer table and ignores the filter
select whatever
from transactions inner join
(
select * from customer
) customer on transactions.customer_id = customer.customer_id
where customer.customer_id = 1;
select whatever
from transactions inner join customer on transactions.customer_id = customer.customer_id
where customer.customer_id = 1;
FROM loan_transaction trans
INNER JOIN customer cust ON trans.customer_id = cust.customer_id
FROM (SELECT * FROM customer LIMIT 50 OFFSET 0) cust
INNER JOIN loan_transaction trans ON trans.customer_id = cust.customer_id