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6 Resolved Adds an index on the derived table AS sb2 s32 AS sb3 FROM t1 AS sb MySQL will create a temporary table for SELECT s1 AS sb1 s2 AS sb2 s32 AS sb3 FROM t1 with no indexes fixed in MySQL 5. 68 sec limit 10 G Index is sorted Scan the whole table in the order of the index Filter results Stop after finding 10 rows matching the where condition If Index points to the beginning of the table physically fast As it stops after 10 rows LIMIT 10 Much more rows to scan and skip Subqueries...
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