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CDA認證小程序

The diagram below is an E-R diagram representing the dimension tables and fact table used in sales management. Please refer to the diagram to answer the following questions: Primary Chinese-English Correspondence. "產(chǎn)品" :"Product" "產(chǎn)品編號" : "Product ID" "產(chǎn)品經(jīng)理" :"Product Manager" “產(chǎn)品類型”: “Product Type” “產(chǎn)品系列”:“Product Series” “城市編號”:“ City Code” “城市經(jīng)理編號”:“ City Manager ID” “城市名”: “City Name” “區(qū)域編號“:“Regional Code” “區(qū)域經(jīng)理“:“Regional Manager” “區(qū)域名“:“Regional Name“ “第三方評級“:“Third-party Rating” “金額”:“Amount” “商機編號”: “Business Opportunity ID” “上周銷售階段”:“ Last Week's Sales Stage” “所屬領(lǐng)域“:“Relevant Domain” “所屬行業(yè)“:“Industry Affiliation” “預(yù)計簽約日“:“Expected Signing Date” Carefully observe the corresponding relationships between the tables in the above diagram and identify one incorrect connection by its number.
A. 1
B. 2
C. 3
D. No errors
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The Customer table and the Opportunity Records table should have a one-to-many relationship between a dimension table and a fact table, so the error is at the number 3, which corresponds to option C.

正確答案是:D: No errors

專業(yè)分析如下:

觀察給定的E-R圖,可以看到各個表之間的關(guān)系和連接。以下是對每個連接的分析:

1. **連接1**:產(chǎn)品(Product)表與事實表(Fact Table)通過產(chǎn)品編號(Product ID)連接。這是一個典型的維度表和事實表的連接方式,符合數(shù)據(jù)庫設(shè)計的規(guī)范。

2. **連接2**:城市(City)表與事實表通過城市編號(City Code)連接。這也是一個典型的維度表和事實表的連接方式,符合數(shù)據(jù)庫設(shè)計的規(guī)范。

3. **連接3**:區(qū)域(Region)表與事實表通過區(qū)域編號(Regional Code)連接。這同樣是一個典型的維度表和事實表的連接方式,符合數(shù)據(jù)庫設(shè)計的規(guī)范。

根據(jù)以上分析,各個連接都符合數(shù)據(jù)庫設(shè)計的規(guī)范和標準,未發(fā)現(xiàn)錯誤連接。因此,正確答案是D: No errors。