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I noticed on the grammar documentation for INSERT in the H2 Database Engine, the optional word DIRECT. The documentation says:

When using DIRECT, then the results from the query are directly applied in the target table without any intermediate step.

When is data inserted not “directly applied”? What are these “intermediated steps”?

➥ What is the purpose of DIRECT?

➥ In what scenarios might one be motivated to use this feature?

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