Which option correctly completes the command to return the first item from a nested array column 'products' in the transactions table?
Understand the Problem
The question is asking which option correctly completes a command to access the first item of a nested array within a specified column in a database table. It focuses on understanding the correct syntax for retrieving data from an array in a programming or query language context.
Answer
Use an array subscript operator to access the first element of a nested array.
The final answer is to use an array subscript operator to access the first element of a nested array.
Answer for screen readers
The final answer is to use an array subscript operator to access the first element of a nested array.
More Information
Array subscript operators allow you to directly access elements within an array by their index position, which is often zero-based.
Tips
A common mistake is forgetting that array indexes are zero-based in most programming languages, so to access the first item, you should use index 0.
Sources
- Specify nested and repeated columns in table schemas | BigQuery - cloud.google.com
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