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Random uniform sampling has been studied in various statistical tasks but fewof them have covered the Q-error metric for cardinality estimation (CE). Inthis paper, we analyze the confidence intervals of random uniform sampling withand without replacement for single-table CE. Results indicate that the upperQ-error bound depends on the sample size and true cardinality. Our bound givesa rule-of-thumb for how large a sample should be kept for single-table CE.

Q-error Bounds of Random Uniform Sampling for Cardinality Estimation