COF-C03 - Performance Optimization, Querying, and Transformation - Section 4.6

Query and transform semi-structured data using the VARIANT, OBJECT, and ARRAY types, FLATTEN, and dot and bracket notation.

Work with semi-structured data such as JSON: load it into a VARIANT column, navigate nested OBJECT and ARRAY values with dot and bracket notation, cast extracted values to typed columns, and use the FLATTEN table function with a LATERAL join to expand arrays into rows. Recognise when to keep data in a VARIANT versus shred it into columns.

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