联合类型 meaning in English

union type

Type as a member type of the union
当前， sql server不支持将qname作为成员类型的联合类型。
Sql server does not support restrictions from union types
Sql server不支持联合类型的限制。
Union types as list items
作为列表项的联合类型
Any simple type , except for a list or union type , is atomic
除列表类型或联合类型以外的所有简单类型都是原子类型。
List types and union types
列表类型和联合类型

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