One way to do this is by using epoch time ie, the number of seconds since 00:00:00 UTC on 1 January 1970. You can use the number data type to represent a date or a timestamp.
Note: If number precision is required the numbers can be passed to DynamoDB as a string type which can be later converted into number type. However, DynamoDB treats them as number type attributes for mathematical operations. Leading and trailing zeroes are trimmed.Īll numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. In DynamoDB, numbers are represented as variable length. Numbers can have up to 38 digits of precision. Numbers can be positive, negative, or zero. The scalar types are number, string, binary, Boolean, and null. The following are descriptions of each data type, along with examples in JSON format. By comparison, relational databases require you to define the names and data types of each column when you create a table. This means that, other than the primary key attributes, you don’t have to define any attributes or data types when you create tables. Furthermore, each primary key attribute must be defined as type string, number, or binary.ĭynamoDB is a NoSQL database and is schemaless. When you create a table or a secondary index, you must specify the names and data types of each primary key attribute (partition key and sort key). The set types are string set, number set, and binary set. Set Types – A set type can represent multiple scalar values.Document Types – A document type can represent a complex structure with nested attributes, such as you would find in a JSON document.Scalar Types – A scalar type can represent exactly one value.ISRO CS Syllabus for Scientist/Engineer ExamĭynamoDB supports many different data types for attributes within a table.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
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