You will need to learn about increasingly complex types of SQL, including joins, subselects, unions, and more.

您需要学习日益增多的 SQL 的复杂类型，包括连接、子选择和联合等。

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Credit unions offer car loans, home equity loans, and other types of loans at highly competitive rates.

合作社为客户提供车贷房贷和其他贷款，利率却不高。

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In addition, there is a hierarchy of derived data types created with pointers, arrays, structures and unions.

另外，还有从指针，数据，结构和联合而产生的导出数据类型层次。

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