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What causes Looker to generate inefficient SQL when users build complex custom dimensions, and how can I train my team to write better LookML?

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What causes Looker to generate inefficient SQL when users build complex custom dimensions, and how can I train my team to write better LookML?
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Looker LookML performance best practices generated SQL custom dimensions joins symmetric aggregates sql_trigger_value official documentationGoogle ↗
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Looker LookML performance best practices generated SQL custom dimensions joins symmetric aggregates sql_trigger_value official documentation
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