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;

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。

dwm_dws_cbsjbz 小表，dwm_sap_zsdt066大表 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 inner 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 = '04' ) AS SFDF GROUP BY ZYEAR,ZMONTH,ZZCPXLT 优化这个语句

这个语句的优化可以从以下几个方面入手：

1. 添加索引：在dwm_dws_cbsjbz表的KAUFN和KDPOS列上添加联合索引，以及在dwm_sap_zsdt066表的VBELN和POSNR列上添加联合索引，可以提高连接查询的效率。

2. 使用子查询：将连接查询的结果作为子查询，避免了大表和小表的直接连接，减少了计算量。

优化后的SQL语句如下：

SELECT ZYEAR, ZMONTH, ZZCPXLT, SUM(VVD02) VVD02
FROM(
    SELECT a.ZYEAR, a.ZMONTH, a.VVD02, c.ZZCPXLT
    FROM dwm_dws_cbsjbz a
    INNER 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;

以上是一种可能的优化方式，具体实现还需要根据你的实际情况进行调整。