Question

我只需要知道如何获得明智的年度总数即可。这是我的代码，需要获得以下预期结果：

SELECT /*+parallel(v,32) +parallel(mm,32) +parallel(c,32) */
    'BUS' VEH_TYPE,
    MM.MAKE_MO,
     SUM (CASE WHEN SUBSTR (V.YEAR_Val, 1, 4) = '1990' THEN 1 ELSE 0 END)
        AS FY1990,
     SUM (CASE WHEN SUBSTR (V.YEAR_VAL, 1, 4) = '1991' THEN 1 ELSE 0 END)
        AS FY1991,
     SUM (CASE WHEN SUBSTR (V.YEAR_VAL, 1, 4) = '1992' THEN 1 ELSE 0 END)
        AS FY1992,
     SUM (CASE WHEN SUBSTR (V.YEAR_VAL, 1, 4) = '1993' THEN 1 ELSE 0 END)
        AS FY1993,
     SUM (CASE WHEN SUBSTR (V.YEAR_VAL, 1, 4) = '1994' THEN 1 ELSE 0 END)
        AS FY1994,
     SUM (CASE WHEN SUBSTR (V.YEAR_VAL, 1, 4) = '1995' THEN 1 ELSE 0 END)
        AS FY1995,
     COUNT (MM.MAKE_MO) Total_Count
     FROM VEHICLE V, MAKE mm, CATEGORY c
     WHERE C.MAKE_MO = mm.MAKE_MO
     AND c.CATEGORY_CD = v.CATEGORY_CD
     AND V.p_MONTH BETWEEN '199001' AND '199501' --using this as data is huge 
     AND C.TYPE_CODE=01
     AND MM.VEH_CODE='B' 
GROUP BY 'BUS,'MM.MAKE_MO, V.YEAR_Val
ORDER BY V.YEAR_Val;

这是预期的结果：

VEH TYPE  YEAR MODEL     TOTAL   
-------   -----        --------  
Bus       1990        7,808,658  
Bus       1991        5,474,809  
Bus       1992        54,839,221  
Bus       1993        54,680,000  
Bus       1994        15,000,000
Bus       1995        17,899,668

Answer 1

评论太久了。展开此查询后，您似乎只是在尝试按车型年份来计算“公共汽车”的数量（<div *ngIf="array['data']"> //business logic </div>表中的所有车辆都被标记为“公共汽车”）。如果是这样，您可以大大简化查询。

VEHICLE

如果您的车龄只有1990-1995，则可能不需要SELECT VEH_TYPE , theYear AS YEAR_MODEL , COUNT(*) AS TOTAL FROM ( SELECT 'BUS' AS VEH_TYPE , SUBSTR(V.YEAR_Val,1,4) AS theYear FROM VEHICLE V INNER JOIN CATEGORY c ON v.CATEGORY_CD = c.CATEGORY_CD AND C.TYPE_CODE='01' INNER JOIN MAKE mm ON c.MAKE_MO = mm.MAKE_MO AND MM.VEH_CODE='B' WHERE V.p_MONTH BETWEEN '199001' AND '199501' ) s1 WHERE theYear IN ('1990','1991','1992','1993','1994','1995') GROUP BY theYear子句。如果WHERE和VEHICLE中没有CATEGORY_CD匹配项，并且如果没有VEHICLE匹配项，那么JOINed表除了限制CATEGORY表外似乎没有做任何其他事情MAKE_MO和MAKE中的CATEGORY个匹配项。如果您要过滤CATEGORY或MAKE中的特定列，或者您在VEHICLE中有孤立的记录，那么您想将这些JOIN添加回去。否则，我不会认为他们真的在做什么。

请注意，SUBSTR(V.YEAR_Val,1,4)会排除您在V.YEAR_Val上拥有的任何索引，如果您经常需要该列，或者如果有很多VEHICLE记录，则可能需要将该值分成自己的列。

需要在下面的所需输出格式中计算逐年总计，但是我得到逐列数据

1 个答案: