Itqualityassurance
What is nested data example?
Nested data
Consider a hypothetical dataset containing information about pets and their toys. We could organize this information in two different tables (a pets table and a toys table). The toys table could contain a "Pet_ID" column that could be used to match each toy to the pet that owns it.
What is nested data types?
Nested data types are structured data types for some common data patterns. Nested data types support structs, arrays, and maps. Popular query engines such as Hive, Spark, Presto, and Redshift Spectrum support nested data types. The SQL syntax those engines support can be different.
How do I nest columns in Bigquery?
To create a column with nested data, set the data type of the column to RECORD in the schema. A RECORD can be accessed as a STRUCT type in Google Standard SQL. A STRUCT is a container of ordered fields. To create a column with repeated data, set the mode of the column to REPEATED in the schema.
