3 ms·
That's true for single-table queries, but less so for multi-table joins. The RDBMS may need to sort your tables (even multiple times) in order to join them toge
by BrentOzar 10y ago
That's true for single-table queries, but less so for multi-table joins. The RDBMS may need to sort your tables (even multiple times) in order to join them together, or the WHERE/GROUP/ORDER can be on combinations of fields and conditions.