Question

我正在使用Apache derbyDB（db2）和SQL Workbench作为环境。我有1万条数据记录，我想用维表和事实表创建一个星型模式。

dwh_price_paid_records = data table
dm_price_paid_records = data mart table (facts table)
dim_time =  data mart table (dimension)

DWH_PRICE_PAID_RECORDS.TRANSACTION_ID = VARCHAR(50)
DWH_PRICE_PAID_RECORDS.PRICE = INTEGER
DWH_PRICE_PAID_RECORDS.DATE_OF_TRANSFER = DATE
DIM_TIME.DATE_ID = Primary key of dim_time (autoincrement start with 1 increment by 1)
DM_PRICE_PAID_RECORDS.DATE_ID = Foreign key NOT NULL from DIM_TIME

在事实表（DM_PRICE_PAID_RECORDS）中，我只想拥有主键，价格（事实）和ID，以便与维度表建立关系，但它不起作用。

INSERT INTO DM_PRICE_PAID_RECORDS (TRANSACTION_ID, PRICE, DATE_ID) VALUES (SELECT TRANSACTION_ID FROM DWH_PRICE_PAID_RECORDS, SELECT PRICE FROM DWH_PRICE_PAID_RECORDS, SELECT DATE_ID FROM DIM_TIME join DWH_PRICE_PAID_RECORDS on DIM_TIME.DATE = DWH_PRICE_PAID_RECORDS.DATE_OF_TRANSFER WHERE DIM_TIME.DATE = 
DWH_PRICE_PAID_RECORDS.DATE_OF_TRANSFER);

我希望这是结果：

TRANSACTION_ID |价格| DATE_ID

1 | 2324 | 423

2 | 52315 | 234

但是我遇到了德语错误，内容如下： “ VALUES子句必须至少包含一个元素。不允许使用空元素”

“价值观-克劳塞尔·穆斯（Klausel musstenestens）感动了元素的热情。里尔·元素（Leere Elemente）犯罪了。

非常感谢！ Flippi

Answer 1

我认为您想要INSERT . . . SELECT：

INSERT INTO DM_PRICE_PAID_RECORDS (TRANSACTION_ID, PRICE, DATE_ID)
    SELECT ppr.TRANSACTION_ID, ppr.PRICE, t.DATE_ID
    FROM DWH_PRICE_PAID_RECORDS ppr JOIN
        DIM_TIME t 
        ON t.DATE = ppr.DATE_OF_TRANSFER ;

为什么我的“ INSERT INTO”语句不起作用？

1 个答案: