关于SQL枢纽查询

Question

这是静态数据透视查询：

SELECT  
    *
FROM
    (SELECT
         PI.PRODID||' '||' ('||PI.PRODNAME||' - '||PI.PACKSIZE||')' PNAME,I.SIA_ID, IP.SALES_QTY
     FROM 
         DIS_INVOICE_INFO I, DIS_INVOICE_PRODUCT IP, MKT_PROD_INFO PI
     WHERE
         I.SLNO = IP.SLNO
         AND PI.PRODID = IP.PRODID) s
PIVOT  
    (SUM(SALES_QTY) 
        FOR SIA_ID IN (10080, 10084, 10082)
    ) pvt

但是我想要一个动态查询。

赞：

......
PIVOT 
    (SUM(SALES_QTY) 
         FOR SIA_ID IN (SELECT DISTINCT SIA_ID FROM DIS_INVOICE_INFO) 
    ) pvt

Answer 1

您没有提到您的DBMS，对于其他DBMS系统我也不知道，但是对于Oracle，只要您重新产生XML的结果，如下所示：

SELECT  
    *
FROM
    (SELECT PI.PRODID||' '||' ('||PI.PRODNAME||' - '||PI.PACKSIZE||')' PNAME,
            I.SIA_ID, IP.SALES_QTY
       FROM DIS_INVOICE_INFO I 
       INNER JOIN DIS_INVOICE_PRODUCT IP 
          ON (I.SLNO = IP.SLNO)
       INNER JOIN MKT_PROD_INFO PI
          ON (PI.PRODID = IP.PRODID)) s
PIVOT XML 
    (SUM(SALES_QTY) 
        FOR SIA_ID IN (SELECT DISTINCT SIA_ID FROM DIS_INVOICE_INFO)
    ) pvt;

通过使用以下DDL语句;

create table DIS_INVOICE_INFO(SIA_ID int, SLNO int);
create table DIS_INVOICE_PRODUCT(PRODID int, SALES_QTY int, SLNO int);
create table MKT_PROD_INFO(PRODID int,PRODNAME varchar(90),PACKSIZE int);

insert all 
       into DIS_INVOICE_INFO values(10080,1);
       into DIS_INVOICE_PRODUCT values(1,100,1);
       into MKT_PROD_INFO values(1,'Milk',200);
select * from dual;

对于上面的SQL-Select语句，您得到以下结果：

   PNAME       SIA_ID_XML
  ------------ ---------- 
  (Milk - 200)   <CLOB>

<CLOB>在哪里

<PivotSet><item><column name = "SIA_ID">10080</column>
<column name = "SUM(SALES_QTY)">100</column></item></PivotSet>

P.s。您不能动态地使用PIVOT，而没有 XML选项，这意味着需要像您的情况一样，在IN子句中明确列出所有参数。