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## Background
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In Milvus, a collection has multiple fields, mainly there are two kinds fields: vector field and scalar field. We call a row as an entity, one entity encapsulates multiple vectors and scalar values.
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In Milvus, a collection has multiple fields, mainly there are two kinds of fields: vector field and scalar field. We call a row as an entity, one entity encapsulates multiple vectors and scalar values.
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When creating a collection, you can specify using the primary key generated automatically, or using the user-provided primary key.
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If a user sets to use the user-provided primary key, each entity inserted must contain the primary key field. Otherwise, the insertion fails.
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