SQL 日期功能中以下查询的查询优化

Question

我创建了查询以从数据库中获取数据，但是当我将它用于其他角色时，它需要很长时间才能加载。

我正在尝试优化以下查询。

SELECT
  *
FROM
  (
    SELECT
      ROWNUM AS RN,
      *
    FROM
      (        select
          t.closedate,
          CASE when t.AbbrevType = 'INV' THEN 'Accounts Receivable' ELSE 'Accounts Payable' End as Account,
          BUILTIN.DF(t.Entity) as Name,
          BUILTIN.DF(tl.subsidiary) as Subsidiary,
          t.Tranid AS SourceTransactionNumber,
          t.TranDate as SourceTransactionDate,
          CASE when t.AbbrevType = 'BILL' THEN 'BILL' WHEN t.AbbrevType = 'INV' THEN 'INVOICE' ELSE 'BILL PAYMENT' End as SourceTransactionType,
          ap.periodname AS UnrealizedGainPostingPeriod,
          CASE WHEN (TO_CHAR (t.TranDate, 'YYYY')) >= (TO_CHAR (ap.startdate, 'YYYY'))
          AND (TO_CHAR (t.TranDate, 'MM')) >= (TO_CHAR (ap.startdate, 'MM')) THEN t.exchangerate WHEN (TO_CHAR (t.TranDate, 'YYYY')) > (TO_CHAR (ap.startdate, 'YYYY'))
          AND (TO_CHAR (t.TranDate, 'MM')) <= (TO_CHAR (ap.startdate, 'MM')) THEN t.exchangerate ELSE cr1.Exchangerate END as BeginningFxRate,
          cr2.Exchangerate as EndFXRate,
          BUILTIN.DF(t.currency) as ForeignCurrency,
          Round(ForeignTotal, 2) as ForeignCurrencyBalance,
          Round(
            (
              (
                cr2.Exchangerate - CASE WHEN (TO_CHAR (t.TranDate, 'YYYY')) >= (TO_CHAR (ap.startdate, 'YYYY'))
                AND (TO_CHAR (t.TranDate, 'MM')) >= (TO_CHAR (ap.startdate, 'MM')) THEN t.exchangerate WHEN (TO_CHAR (t.TranDate, 'YYYY')) > (TO_CHAR (ap.startdate, 'YYYY'))
                AND (TO_CHAR (t.TranDate, 'MM')) <= (TO_CHAR (ap.startdate, 'MM')) THEN t.exchangerate ELSE cr1.Exchangerate END
              ) * ForeignTotal
            ),
            2
          ) AS NetGainLoss,
          cexr.averagerate as ConsolidatedExchangeRate,
          Round(
            (
              (
                cr2.Exchangerate - CASE WHEN (TO_CHAR (t.TranDate, 'YYYY')) >= (TO_CHAR (ap.startdate, 'YYYY'))
                AND (TO_CHAR (t.TranDate, 'MM')) >= (TO_CHAR (ap.startdate, 'MM')) THEN t.exchangerate WHEN (TO_CHAR (t.TranDate, 'YYYY')) > (TO_CHAR (ap.startdate, 'YYYY'))
                AND (TO_CHAR (t.TranDate, 'MM')) <= (TO_CHAR (ap.startdate, 'MM')) THEN t.exchangerate ELSE cr1.Exchangerate END
              ) * (ForeignTotal * cexr.averagerate)
            ),
            2
          ) AS ConsolidatedGainLoss,
        from
          Transaction t
          INNER JOIN TransactionLine tl ON (tl.Transaction = t.ID)
          AND (tl.MainLine = 'T')
          AND (
            (t.CloseDate IS NULL)
            OR (
              t.CloseDate >= TO_DATE('5/01/2019', 'MM-DD-YYYY')
            )
            AND (t.TranDate <= TO_DATE('5/31/2019', 'MM/DD/YYYY'))
          )
          INNER JOIN Subsidiary sb ON sb.id = tl.subsidiary
          INNER JOIN AccountingPeriod ap ON (
            (
              ap.id BETWEEN (298)
              AND (298)
            )
            AND ap.isposting = 'T'
          )
          INNER JOIN CurrencyRate cr1 ON (
            cr1.BaseCurrency = sb.currency
            AND cr1.TransactionCurrency = t.Currency
            AND cr1.EffectiveDate = TO_DATE(ap.startdate, 'MM/DD/YYYY')
          )
          INNER JOIN CurrencyRate cr2 ON (
            cr2.BaseCurrency = sb.currency
            AND cr2.TransactionCurrency = t.Currency
            AND cr2.EffectiveDate = TO_DATE(ap.enddate, 'MM/DD/YYYY')
          )
          INNER JOIN consolidatedexchangerate cexr ON (
            cexr.postingperiod = t.PostingPeriod
            AND cexr.fromsubsidiary = tl.subsidiary
            AND cexr.tosubsidiary = 1
          )
        Where
          (
          
            t.AbbrevType LIKE  ('%INV')
              OR t.AbbrevType LIKE ('%BILL')         
            
     
          AND 
            tl.subsidiary IN (
              1,
              2,
              3,
              4,
              5,
              6,
              7,
              10,
              11,
              12,
              13,
              19,
              21,
              30,
              32,
              33,
              34,
              35,
              39,
              42,
              49,
              52,
              55,
              63,
              64,
              65,
              66,
              68,
              8,
              9,
              15,
              16,
              31,
              36,
              37,
              41,
              43,
              47,
              48,
              54,
              56,
              57,
              58,
              59,
              69,
              70
            )
          )
            AND 
            t.CloseDate IS NULL
            OR 
              t.CloseDate >= TO_DATE('7/01/2021', 'MM-DD-YYYY')
            
            AND t.TranDate <= TO_DATE('7/31/2021', 'MM/DD/YYYY')
         )
  )
WHERE
  (
    RN BETWEEN 1
    AND 5000
  )

它所带的负载在区域

 AND 
            t.CloseDate IS NULL
            OR 
              t.CloseDate >= TO_DATE('7/01/2021', 'MM-DD-YYYY')
            
            AND t.TranDate <= TO_DATE('7/31/2021', 'MM/DD/YYYY')

我发现查询中的日期功能在获取数据时占用了更多负载。

还有其他可以优化的地方吗？

Answer 1

我需要你的那些“tables”和“数据”来全面测试和优化这个查询，所以我可以只看查询并向你解释那些对性能有负面影响的部分.

当你在where子句中使用“OR”时，数据库不能使用索引字段。 table 将是全面扫描。这是一个糟糕的表现。您可以使用 UNION 而不是 OR。例如：
```
 select * from products
 where price = 25 or price = 10;

 select * from products
 where price = 25 
 union all 
 select * from products
 where price = 10;
```
你也在连接条件中使用 OR，这是非常糟糕的性能。
当条件中总是使用两个或三个字段时，因此为组合这些字段创建一个索引比为每个字段创建一个单独的索引具有更高的性能，例如：

CREATE UNIQUE INDEX products_name_idx ON products USING btree (name, price);

SQL 日期功能中以下查询的查询优化

SQL Query optimization for the following query in Date functionality

sql

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