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full table scan for an OR in a WHERE statement...

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Understanding Rails / PG Explain...

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MySQL has indexed tables and EXPLAIN looks good, but still not using index...

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MySql Explain ignoring the unique index in a particular query...

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mysql - OR operator not using index...

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Indexes not being shown as possible keys...

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MySQL EXPLAIN statement shows ALL on type...

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Understanding the output of an EXPLAIN statement (MySQL)...

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MySQL EXPLAIN automatic analyzing...

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MYSQL query EXPLAIN SELECT...

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MySQL. Creating an index for "OR" queries...

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There is no possible_keys available, but there exists keys in the where clause...

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How to determine what is more effective: DISTINCT or WHERE EXISTS?...

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indexed query, but still searching every row...

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Efficiency of multicolumn indexes in MySQL...

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joining table in mysql not using index properly?...

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Mysql Order by clause using "FileSort"...

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Mysql query optimisation, EXPLAIN and slow execution...

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MySQL: 'EXPLAIN' showing different explanations for similar queries...

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Optimise query using filesort and temporary...

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Slow query grouping on blob column...

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mysql foreign key does not work...

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Judging Length of SQL Query based on Explain...

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SELECT statement not using possible_keys...

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mysql using temporary table with subqueries, but not group by and order by...

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