SELECT ZYEAR,ZMONTH,IFNULL(ZZCPXLT,"无系列归集") ZZCPXLT,SUM(NETWR) VVD02 ,sum(VVD04) VVD04 FROM( SELECT a.ZYEAR, a.ZMONTH, a.KAUFN, a.KDPOS, a.MATNR, a.AUART, a.MFRGR, a.NETWR, b.VVD04, c.ZZCPXLT FROM dwm_dws_cbsjbz a left join dwm_dws_cbsjbc b on a.KAUFN = b.KAUFN and a.KDPOS = b.UEPOS left JOIN ( SELECT VBELN, POSNR, ZZCPXLT FROM dwm_sap_zsdt066 WHERE VBELN IN ( SELECT KAUFN FROM dwm_dws_cbsjbz WHERE AUART = 'OR1' AND ZYEAR = '2023' and zmonth = '05' ) ) c ON a.KAUFN = c.VBELN AND a.KDPOS = c.POSNR WHERE a.AUART = 'OR1' AND a.ZYEAR = '2023' AND a.ZMONTH = '05' ) AS SFDF GROUP BY ZYEAR,ZMONTH,ZZCPXLT 语句优化 ,dwm_dws_cbsjbz a 表数据必须完整。
时间: 2024-03-28 09:39:40 浏览: 21
我理解你的问题是关于如何优化这段 SQL 语句,并且需要保证 `dwm_dws_cbsjbz` 表的数据完整性。下面是我提供的一些优化建议:
1. 索引优化:根据查询条件,对 `dwm_dws_cbsjbz` 表的 `AUART`、`ZYEAR`、`ZMONTH` 字段建立索引,以加快查询速度。
2. 子查询优化:将 `dwm_dws_cbsjbz` 表中的 `AUART`、`ZYEAR`、`ZMONTH` 的查询结果缓存,避免重复查询。
3. LEFT JOIN 改为 INNER JOIN:因为 WHERE 子句中已经限定了 `AUART` = 'OR1',所以可以将 `dwm_dws_cbsjbz` 和 `dwm_sap_zsdt066` 表的 LEFT JOIN 改为 INNER JOIN,以减少查询的数据量。
4. 减少子查询:将 `dwm_sap_zsdt066` 表的子查询提取出来单独执行,将结果保存到一个临时表中,然后将临时表和其他表进行 JOIN。
5. 数据完整性:确保 `dwm_dws_cbsjbz` 表的数据完整性,可以通过数据校验、数据备份等方式来保障。
综上所述,可以通过索引优化、子查询优化、INNER JOIN、减少子查询等方式来优化这段 SQL 语句,并且保障 `dwm_dws_cbsjbz` 表的数据完整性。
相关问题
SELECT ZYEAR,ZMONTH,ZZCPXLT,SUM(VVD02) VVD02 FROM( SELECT a.ZYEAR, a.ZMONTH, a.KAUFN, a.KDPOS, a.MATNR, a.AUART, a.VVD02, c.ZZCPXLT FROM dwm_dws_cbsjbz a left JOIN ( SELECT VBELN, POSNR, ZZCPXLT FROM dwm_sap_zsdt066 WHERE VBELN IN ( SELECT KAUFN FROM dwm_dws_cbsjbz WHERE AUART = 'OR1' AND ZYEAR = '2023' AND ZMONTH = '04' ) ) c ON a.KAUFN = c.VBELN AND a.KDPOS = c.POSNR WHERE a.AUART = 'OR1' AND a.ZYEAR = '2023' AND a.ZMONTH = '04' ) AS SFDF GROUP BY ZYEAR,ZMONTH,ZZCPXLT 为关键字ZZCPXLT 是NULL的赋值为无系列
您可以使用如下SQL语句将关键字ZZCPXLT是NULL的赋值为“无系列”:
```
SELECT
ZYEAR,
ZMONTH,
NVL(ZZCPXLT,'无系列') AS ZZCPXLT,
SUM(VVD02) VVD02
FROM(
SELECT
a.ZYEAR,
a.ZMONTH,
a.KAUFN,
a.KDPOS,
a.MATNR,
a.AUART,
a.VVD02,
c.ZZCPXLT
FROM
dwm_dws_cbsjbz a
LEFT JOIN (
SELECT VBELN, POSNR, ZZCPXLT
FROM dwm_sap_zsdt066
WHERE VBELN IN (
SELECT KAUFN
FROM dwm_dws_cbsjbz
WHERE AUART = 'OR1'
AND ZYEAR = '2023'
AND ZMONTH = '04'
)
) c ON a.KAUFN = c.VBELN AND a.KDPOS = c.POSNR
WHERE
a.AUART = 'OR1'
AND a.ZYEAR = '2023'
AND a.ZMONTH = '04'
) AS SFDF
GROUP BY ZYEAR, ZMONTH, ZZCPXLT;
```
在查询结果中,关键字ZZCPXLT为NULL的记录将会被替换为“无系列”并显示出来。
SELECT ZYEAR,ZMONTH,IFNULL(ZZCPXLT,"无系列归集") ZZCPXLT,SUM(NETWR) VVD02 ,sum(VVD04) VVD04 FROM( SELECT a.ZYEAR, a.ZMONTH, a.KAUFN, a.KDPOS, a.MATNR, a.AUART, a.MFRGR, a.NETWR, b.VVD04, c.ZZCPXLT FROM dwm_dws_cbsjbz a left join dwm_dws_cbsjbc b on a.KAUFN = b.KAUFN and a.KDPOS = b.UEPOS left JOIN ( SELECT VBELN, POSNR, ZZCPXLT FROM dwm_sap_zsdt066 WHERE VBELN IN ( SELECT KAUFN FROM dwm_dws_cbsjbz WHERE AUART = 'OR1' AND ZYEAR = '2023' and zmonth = '05' ) ) c ON a.KAUFN = c.VBELN AND a.KDPOS = c.POSNR WHERE a.AUART = 'OR1' AND a.ZYEAR = '2023' AND a.ZMONTH = '05' ) AS SFDF GROUP BY ZYEAR,ZMONTH,ZZCPXLT 语句优化
这是一个对销售订单数据进行聚合统计的 SQL 语句,以下是一些可能的优化建议:
1. 尽量避免使用子查询,可以将子查询转换为连接查询或者使用临时表。
2. 避免在 SELECT 语句中使用 IFNULL 函数,可以使用 COALESCE 函数代替。
3. 如果可能的话,尽量使用 INNER JOIN 而不是 LEFT JOIN,因为 INNER JOIN 的查询效率更高。
4. 如果表中存在大量数据,可以考虑对表中的字段建立索引以提高查询效率。
5. 如果数据库版本支持,可以使用分区表来提高查询效率。
以下是经过优化的 SQL 语句,仅供参考:
```
SELECT a.ZYEAR, a.ZMONTH, COALESCE(c.ZZCPXLT, '无系列归集') AS ZZCPXLT, SUM(a.NETWR) AS VVD02, SUM(b.VVD04) AS VVD04
FROM dwm_dws_cbsjbz a
INNER JOIN dwm_dws_cbsjbc b ON a.KAUFN = b.KAUFN AND a.KDPOS = b.UEPOS
LEFT JOIN dwm_sap_zsdt066 c ON a.KAUFN = c.VBELN AND a.KDPOS = c.POSNR
WHERE a.AUART = 'OR1' AND a.ZYEAR = '2023' AND a.ZMONTH = '05'
GROUP BY a.ZYEAR, a.ZMONTH, ZZCPXLT;
```