In this episode, we’ll explore field compatibility in the Google Ads Query Language (GAQL) and explain why certain segments, metrics, and resources can or cannot be present in the same GAQL query. This episode builds upon prior episodes in the GAQL playlist to demonstrate how to use the GoogleAdsFieldService to determine which fields are selectable with each other. We’ll then flip our attention to the Google Ads Query Builder, an interactive, browser-based tool in the Google Ads API documentation site, and explain how to use this tool to easily determine field compatibility and build GAQL queries.
GAQL Query Validation: Field Compatibility
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Last updated 2025-08-20 UTC.