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Which statement about the behavior of multiple CTEs in a single WITH clause is TRUE?

hard📝 Conceptual Q10 of 15
SQL - Common Table Expressions (CTEs)
Which statement about the behavior of multiple CTEs in a single WITH clause is TRUE?
ACTEs cannot be recursive
BCTEs are evaluated simultaneously and cannot reference each other
CCTEs must be defined in separate WITH clauses
DCTEs are evaluated in order and can reference any previously defined CTEs
Step-by-Step Solution
Solution:

  1. Step 1: Understand CTE evaluation order

    Multiple CTEs in one WITH clause are evaluated in order, so later CTEs can reference earlier ones.

  2. Step 2: Check other statements

    CTEs are not evaluated simultaneously (B), can be in one WITH clause (C), and can be recursive (A is false).

  3. Final Answer:

    CTEs are evaluated in order and can reference any previously defined CTEs -> Option D

  4. Quick Check:

    CTEs order matters for references [OK]
Quick Trick: Later CTEs can use earlier CTEs in WITH clause [OK]
Common Mistakes:
  • Thinking CTEs evaluate simultaneously
  • Believing CTEs must be separate
  • Assuming no recursion allowed

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