#Db2 json query example how to#

The first column is just a normal string, but the second column is an array of strings, containing the colors.įor Primary Colors and Secondary Colors, we see that each array contains three elements each.įor Black and White, the array only contains two elements. We have two columns: category and samples_array. SELECT 'Primary Colors' AS category, AS samples_array Here, we create a sample query using colors. This way, we can reference the colors table. Throughout this guide, we can add this WITH clause ( also known as CTE) on top of all our queries. Creating a Sample Query with ArraysĪn array can be created using the brackets, such as, or. Throughout this guide, we include actual screenshots from the BigQuery console. In the BigQuery Console, we can see an array as a multi-row entry.

An array cannot have another array inside.

An array may have zero, one, or more elements inside.

If it contains strings, then all elements (including numbers) will be treated as strings. If an array contains all numbers, then we can only store numbers.

The elements inside each array must all have the same data type.

Like our integers, numbers, and dates, an array is a data type in BigQuery. Think of an array in SQL as a special container.

Using BigQuery ARRAY_CONCAT and ARRAY_TO_STRING.

Error Message: array cannot have a null element error in writing field.

#Db2 json query example how to#

How to Check if an Array Contains an Element in BigQuery?.Scenario 2: Using JSON_EXTRACT_ARRAY and UNNEST.

Scenario 1: Using JSON_EXTRACT_ARRAY Only.