The use of these languages has been extended to the relational model.
这些语言的使用已经扩展到了关系模型中。
Today, the most common model is the relational model with the SQL standard.
目前，最常见的模型是采用SQL标准的关系模型。
Compared with the hierarchical model, the relational model is quite complicated.
与层次模型相比，关系模型相当复杂。
Compared with the hierarchical model, the relational model is quite complicated.
与层次模型相比，关系模型相当复杂。
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