Question

我的transactionDetail表有3亿个数据。要获取我的查询数据需要很长时间。

下面是我的查询

 select 
 MerchantId as y_m,BoothId ,
 TransactionTypeId , 
 count(Amount) , 
 sum(Amount)  
 from TransactionDetail  
 where TransactionDate>='2014-02-26' 
 and TransactionDate<'2019-02-27' 
 and not (BoothId like 'TEST%')  
 and MerchantId in (select MerchantId from MerchantGroup where  MerchantClassId='MD-SAFAL') 
 group by MerchantId, BoothId, TransactionTypeId 
 order by y_m asc, BoothId asc, TransactionTypeId asc;

TransactionDetail表具有以下键和索引

主键（TransactionId）

索引低于

密钥idxTransactionDetail003（MerchantId），
密钥idxTransactionDetail004（TransactionDate）

MerchantGroup表在MerchantId列上具有索引

Answer 1

您可以在TransactionDetail列（MerchantId，TransactionDate，BoothId）上添加一个复合索引

，您可以使用内部联接代替IN子句

并使用not like代替not（like）

    select d.MerchantId as y_m
    ,d.BoothId 
    ,d.TransactionTypeId 
    , count(d.Amount) , sum(d.Amount)  
    from TransactionDetail d
    INNER JOIN (
        select MerchantId 
        from MerchantGroup 
        where MerchantClassId='MD-SAFAL'
    ) t t.MerchantId = d.MerchantId
    where d.TransactionDate>='2014-02-26' 
        and d.TransactionDate<'2019-02-27' 
    and d.BoothId not like 'TEST%'  
    group by d.MerchantId, d.BoothId, d.TransactionTypeId 
    order by y_m asc, d.BoothId asc, d.TransactionTypeId asc;

myquery在mysql中花费太长时间

1 个答案: