oracle model子句学习笔记例 解析

学习 东方醉仙 的 “oracle model子句学习笔记例”，并记之

总看model子句 

SELECT PRODUCT, COUNTRY, YEAR, WEEKS, RECEIPTS, SALE, INVENTORY  FROM SALES_FACT
 WHERE /*COUNTRY = 'Australia'
   AND PRODUCT = 'Xtend Memory'
   AND */
 YEAR = '2001'
 AND WEEKS <= 5
 AND ROWNUM <= 50
/*MODEL 标示字*/
 MODEL
/*RETURN {ALL|UPDATED} ROWS 返回的结果集是否只包含修改或新增的记录,默认是ALL*/
 RETURN UPDATED ROWS
/*PARTITION BY 按参数中的列分组，之后的运算都是分组进行的；参数可以是表达式，但是必须有别名*/
 PARTITION BY(PRODUCT, COUNTRY)
/*DIMENSION BY 声明各分组中的维度字段，相当于多维键值对的建，字段值即键；参数可以是表达式，但是必须有别名*/
 DIMENSION BY(YEAR, WEEKS)
/*MEASURES 声明各分组中的指标字段，即键值对中的值；参数可以是表达式，但是必须有别名*/
 MEASURES(0 INVENTORY, RECEIPTS, SALE)
/*AUTOMATIC ORDER|SEQUENTIAL ORDER 指标计算的顺序，逻辑依赖顺序|书写顺序，默认是SEQUENTIAL ORDER 。*/
 RULES AUTOMATIC
 ORDER
/*-6.008 = 12.016 + 162.216 - 180.24*/
(INVENTORY [ YEAR, WEEKS ] = NVL(INVENTORY [ CV(YEAR), CV(WEEKS) - 1 ], 0)
/**/
+RECEIPTS [ CV(YEAR), CV(WEEKS) ]
/**/
-SALE [ CV(YEAR), CV(WEEKS) ]
/**/
)
 ORDER BY PRODUCT, COUNTRY, WEEKS, RECEIPTS, SALE

excel对应部分公式见 http://download.csdn.net/detail/jgmydsai/6014673

位置标记

SELECT PRODUCT, COUNTRY, YEAR, WEEKS, RECEIPTS, SALE, INVENTORY
  FROM SALES_FACT
 WHERE COUNTRY = 'Australia'
   AND PRODUCT = 'Xtend Memory'
   AND YEAR IN ('2001', '2002')
   AND WEEKS <= 5
/*MODEL 标示字*/
 MODEL
/*RETURN {ALL|UPDATED} ROWS 返回的结果集是否只包含修改或新增的记录,默认是ALL*/
 RETURN UPDATED ROWS
/*PARTITION BY 按参数中的列分组，之后的运算都是分组进行的；参数可以是表达式，但是必须有别名*/
 PARTITION BY(PRODUCT, COUNTRY)
/*DIMENSION BY 声明各分组中的维度字段，相当于多维键值对的建，字段值即键；参数可以是表达式，但是必须有别名*/
 DIMENSION BY(YEAR, WEEKS)
/*MEASURES 声明各分组中的指标字段，即键值对中的值；参数可以是表达式，但是必须有别名*/
 MEASURES(0 INVENTORY, RECEIPTS, SALE)
/*AUTOMATIC ORDER|SEQUENTIAL ORDER 指标计算的顺序，逻辑依赖顺序|书写顺序，默认是SEQUENTIAL ORDER 。*/
 RULES AUTOMATIC
 ORDER
/**/
(INVENTORY [ YEAR, WEEKS ] = NVL(INVENTORY [ CV(YEAR), CV(WEEKS) - 1 ], 0)
/**/
+RECEIPTS [ CV(YEAR), CV(WEEKS) ]
/**/
-SALE [ CV(YEAR), CV(WEEKS) ],
/*原数据中没有2002新增一行*/
SALE [ 2002, 1 ] = 0,
/**/
RECEIPTS [ 2002, 1 ] = 0
/**/
)

符号标记

SELECT PRODUCT, COUNTRY, YEAR, WEEKS, SALE
  FROM SALES_FACT
 WHERE PRODUCT = 'Xtend Memory'
   AND COUNTRY = 'Australia'
 MODEL
 /*只返回修改过和数据*/
 RETURN UPDATED ROWS
 PARTITION BY(PRODUCT, COUNTRY)
 DIMENSION BY(YEAR, WEEKS)
 MEASURES(SALE)
 RULES /**/
       (SALE [ YEAR IN ('2000', '2001'),
        WEEKS IN (1, 2) ] ORDER BY YEAR,
        WEEKS = SALE [ CV(YEAR),
        CV(WEEKS) ] * 1.2
        /**/)
 ORDER BY YEAR, WEEKS;

/*等价于*/

SELECT PRODUCT, COUNTRY, YEAR, WEEKS, SALE * 1.2 AS SALE
  FROM SALES_FACT
 WHERE PRODUCT = 'Xtend Memory'
   AND COUNTRY = 'Australia'
   AND YEAR IN ('2000', '2001')
   AND WEEKS IN (1, 2);

model子句中for循环

SELECT PRODUCT,COUNTRY,YEAR,WEEKS,RECEIPTS,SALE--,INVENTORY
FROM SALES_FACT
WHERE PRODUCT = 'Xtend Memory'
  AND COUNTRY = 'Australia'
  AND YEAR = '2001'
  AND WEEKS <= 10
MODEL RETURN UPDATED ROWS
PARTITION BY (PRODUCT,COUNTRY)
DIMENSION BY (YEAR,WEEKS)
MEASURES(RECEIPTS,SALE,0 INVENTORY)
RULES AUTOMATIC ORDER
(
INVENTORY[YEAR,WEEKS] = NVL(INVENTORY[CV(YEAR),CV(WEEKS)-1],0)
                      + RECEIPTS[CV(YEAR),CV(WEEKS)]
                      - SALE[CV(YEAR),CV(WEEKS)],
/*FOR 循环 符合条件数据改为0*/
SALE[2001,FOR WEEKS FROM 3 TO 10 INCREMENT 1] = 0,
RECEIPTS[2001,FOR WEEKS FROM 3 TO 10 INCREMENT 1] = 0
)
ORDER BY WEEKS,RECEIPTS,SALE

关于return updated rows子句

SELECT PRODUCT,COUNTRY,YEAR,WEEKS,SALE
FROM SALES_FACT
WHERE PRODUCT = 'Xtend Memory'
  AND COUNTRY = 'Australia'
MODEL
/*返回所有数据包括修改及未修改的*/
RETURN ALL ROWS
PARTITION BY (PRODUCT,COUNTRY)
DIMENSION BY (YEAR,WEEKS)
MEASURES(SALE)
RULES
(
SALE[YEAR IN('2000','2001'),WEEKS IN(1,2)]
ORDER BY YEAR,WEEKS
= SALE[CV(YEAR),CV(WEEKS)]*1.2
)
ORDER BY YEAR,WEEKS

在model子句中使用聚合函数

SELECT PRODUCT,COUNTRY,YEAR,WEEKS,SALE,AVG_SALE,INVENTORY,MAX_INVTY
FROM SALES_FACT
WHERE PRODUCT = 'Xtend Memory'
  AND COUNTRY = 'Australia'
  AND YEAR = '2001'
  AND WEEKS <= 10
MODEL RETURN UPDATED ROWS
PARTITION BY (PRODUCT,COUNTRY)
DIMENSION BY (YEAR,WEEKS)
MEASURES (RECEIPTS,SALE,0 INVENTORY,0 AVG_SALE,0 MAX_INVTY)
RULES AUTOMATIC ORDER
(
INVENTORY[YEAR,WEEKS] = NVL(INVENTORY[CV(YEAR),CV(WEEKS)-1],0)
                      + RECEIPTS[CV(YEAR),CV(WEEKS)]
                      - SALE[CV(YEAR),CV(WEEKS)],
AVG_SALE[YEAR,ANY] = AVG(SALE)[CV(YEAR),WEEKS],
MAX_INVTY[YEAR,ANY] = MAX(INVENTORY)[CV(YEAR),WEEKS]
)
ORDER BY WEEKS,SALE,INVENTORY