有没有办法改进更多这个查询

Question

我一直在学习如何使用 INNER JOIN，所以我修改了以下查询以使用 inner join，但是我在查询的最后一个片段上遇到了问题，是否可以在那里使用 inner join？我遇到了麻烦，因为“MOV”是在此片段之前完成的查询...有人可以帮助我了解如何在那里使用吗？以下查询有效，尽我所能改进它们

片段：

FROM   TBLMOVOBLIGACIONES MOV1
                                  WHERE MOV1.STRMOVANOMES = :periodo
                                   AND  MOV1.STRCLINIT = MOV.STRCLINIT
                                   AND  MOV1.STROBLOBLIGSARC = MOV.STROBLOBLIGSARC

完整查询：

SELECT * FROM (

 

SELECT MOV.NUMPROCODIGO APLICATIVO,
       MOV.STRCLINIT NIT,
       CL.STRCLINOMBRE CLIENTE,
       MOV.STROBLOBLIGSARC OBLIGACION,
       MOV.NUMMOVVLRCAPCREDITO + MOV.NUMMOVVLRINTCREDI + MOV.NUMMOVVLRCAPOTRO SALDO_OBL,
       MOV.NUMMOVTIPOCREDITO TIPO_CREDITO,
       MOV.NUMMOVNRODIASCAP DIAS_CAP,
       MOV.NUMMOVNRODIASINT DIAS_INT,
       MOV.STRMOVCALIFEDAD,
       CASE 
        WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=0 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 30 THEN 'A'
        WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=31 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 90 THEN 'B'
        WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=91 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 180 THEN 'C'
        WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=181 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 360 THEN 'D'
        WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=361 THEN 'E'
       END AS CALIFEDAD_REAL
FROM TBLMOVOBLIGACIONES MOV INNER JOIN TBLCLIENTES CL ON MOV.STRCLINIT = CL.STRCLINIT 
WHERE MOV.STRMOVANOMES = :periodo
 AND  MOV.NUMPROCODIGO NOT IN (24)
 AND MOV.NUMMOVVLRCAPCREDITO + MOV.NUMMOVVLRINTCREDI + MOV.NUMMOVVLRCAPOTRO > 0
 AND  MOV.NUMMOVTIPOCREDITO = 1
 AND  NVL(MOV.STRMOVCALIFEDAD,'N') != (SELECT CASE 
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=0 AND GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) <= 30  THEN 'A'
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=31 AND GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) <= 90 THEN 'B'
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=91 AND GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) <= 180 THEN 'C'
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=181 AND GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) <= 360 THEN 'D'
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=361 THEN 'E'
                                     END AS CALIF_CALC
                              FROM   TBLMOVOBLIGACIONES MOV1
                              WHERE MOV1.STRMOVANOMES = :periodo
                               AND  MOV1.STRCLINIT = MOV.STRCLINIT
                               AND  MOV1.STROBLOBLIGSARC = MOV.STROBLOBLIGSARC)

Answer 1

我会质疑你的这部分查询：

 AND  NVL(MOV.STRMOVCALIFEDAD,'N') != (SELECT CASE 
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=0 AND GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) <= 30  THEN 'A'
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=31 AND GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) <= 90 THEN 'B'
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=91 AND GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) <= 180 THEN 'C'
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=181 AND GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) <= 360 THEN 'D'
                                      WHEN GREATEST(NVL(MOV1.NUMMOVNRODIASCAP,0), NVL(MOV1.NUMMOVNRODIASINT,0)) >=361 THEN 'E'
                                     END AS CALIF_CALC
                              FROM   TBLMOVOBLIGACIONES MOV1
                              WHERE MOV1.STRMOVANOMES = :periodo
                               AND  MOV1.STRCLINIT = MOV.STRCLINIT
                               AND  MOV1.STROBLOBLIGSARC = MOV.STROBLOBLIGSARC)

要么 (strmovanomes, strclinit, stroblobligsarc) 包含（或恰好是）tblmovobligaciones 的主键，要么不包含。

If if does，则子查询正在查询 tblmovobligaciones 中您已有的同一行。在这种情况下，应删除子查询并将条件替换为：

 AND  NVL(MOV.STRMOVCALIFEDAD,'N') != CASE 
                                      WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=0 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 30  THEN 'A'
                                      WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=31 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 90 THEN 'B'
                                      WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=91 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 180 THEN 'C'
                                      WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=181 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 360 THEN 'D'
                                      WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=361 THEN 'E'
                                     END

如果它不那么是什么阻止该子查询返回多行（这会在运行时导致错误）？

您也可以 select 那个大表达式一次并重复使用它。这是一个偏好问题。看起来像这样：

SELECT MOV.NUMPROCODIGO APLICATIVO,
       MOV.STRCLINIT NIT,
       CL.STRCLINOMBRE CLIENTE,
       MOV.STROBLOBLIGSARC OBLIGACION,
       MOV.NUMMOVVLRCAPCREDITO + MOV.NUMMOVVLRINTCREDI + MOV.NUMMOVVLRCAPOTRO SALDO_OBL,
       MOV.NUMMOVTIPOCREDITO TIPO_CREDITO,
       MOV.NUMMOVNRODIASCAP DIAS_CAP,
       MOV.NUMMOVNRODIASINT DIAS_INT,
       MOV.STRMOVCALIFEDAD,
       mov.califedad_real_expr CALIFEDAD_REAL
FROM ( SELECT mov.*,
              CASE 
                WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=0 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 30 THEN 'A'
                WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=31 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 90 THEN 'B'
                WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=91 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 180 THEN 'C'
                WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=181 AND GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) <= 360 THEN 'D'
                WHEN GREATEST(NVL(MOV.NUMMOVNRODIASCAP,0), NVL(MOV.NUMMOVNRODIASINT,0)) >=361 THEN 'E'
              END AS califedad_real_expr
        FROM TBLMOVOBLIGACIONES MOV) MOV 
INNER JOIN TBLCLIENTES CL ON MOV.STRCLINIT = CL.STRCLINIT 
WHERE MOV.STRMOVANOMES = :periodo
 AND  MOV.NUMPROCODIGO NOT IN (24)
 AND MOV.NUMMOVVLRCAPCREDITO + MOV.NUMMOVVLRINTCREDI + MOV.NUMMOVVLRCAPOTRO > 0
 AND  MOV.NUMMOVTIPOCREDITO = 1
 AND  NVL(MOV.STRMOVCALIFEDAD,'N') != mov.califedad_real_expr

（假设我认为子查询是不必要的是对的）

有没有办法改进更多这个查询

Is there a way to improve more this query

sql

oracle

query-performance