Oracle模式SQL基礎知識

--建立用於測試的表及資料

create table t603
(  code  varchar2(10),
year  varchar2(10),
month varchar2(10),
p_id  varchar2(7),
v1    number(10),
v2    number(10)
);comment on column t603.code is '工廠';
comment on column t603.year is '年份';
comment on column t603.month is '月份';
comment on column t603.p_id is '產品';
comment on column t603.v1 is '生產量';
comment on column t603.v2 is '銷售量';
insert into t603 values('600001',2012,11,'30',1,1);
insert into t603 values('600001',2012,11,'31',1,1);
insert into t603 values('600001',2012,11,'10',2,2);
insert into t603 values('600002',2012,12,'10',3,2);
insert into t603 values('600002',2012,12,'31',2,1);
insert into t603 values('600002',2012,12,'30',2,1);
select * from t603;

select code,

p_id,
v1 from t603
where code in ('600001', '600002') 
model return updated rows --model後面的return updated rows子句將結果限制為在該查詢中建立或更新的那些行，使結果集只包含新計算的值。
partition by(code)        --分割槽
dimension by(p_id)        --維度
measures(v1)              --度量
rules (v1['err1'] = v1['30'] + v1['31'] - v1['10']) --計算規則
order by code, p_id;

1600001err10

2600002err11

--按多個規則聚合，返回包括非聚合行

select code,

year,
p_id, 
month,
v1from t603
where year = '2012'
model
partition by (code,year)
dimension by (p_id,month)
measures (v1,v2)
rules (
v1['err1',11] = v1['30',11] + v1['31',11] - v1['10',11],
v2['err1',12] = v2['30',12] + v2['31',12] - v2['10',12])
order by code, p_id;

46000012012err112

56000012012err1110

96000022012err112

106000022012err111

--指定要聚合的維值

select code,

p_id, 
month,
v1from t603
where year = '2012'
model return updated rows
partition by (code)
dimension by (p_id,month)
measures (v1)
rules (
v1['err1',for month in(11,12)] = v1['30',cv(month)] + v1['31',cv(month)] -v1['10',cv(month)])
order by code, p_id, month;

1600001err1110

2600001err112

3600002err111

4600002err1121

--cv()函式獲取多行統計記錄的當前值，可以使用表示式進行計算

--為數值型可用語法：for month from 1 to 12 increment 1

--還可以使用子查詢：for year in (select year from t603)

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