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row. Even though they are fast, table variables do not perform well in joins. Tip 3: Use conditional WHERE clause Conditional WHERE clauses are used for subsetting. Let’s say you have a situation like this: -if SEQ_VAR in (1, 2, 3) & diff(DATE_VAR2, DATE_VAR1)≥ 0 — elif SEQ_VAR in (4, 5, 6) &