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indexable and none indexable compund predicates in query


MySQL: Index when joining to tables not being used (Performance optimizing question)Oracle concatenation of queries and function index usageEfficiently select beginning and end of multiple contiguous ranges in Postgresql queryMS-SQL index not using all the available columns as seek predicatesYet another slow query Postgresql 9.3Is database record access sequential after retrieving the indexed page from disk?Unused index in range of dates queryB Tree and B+Tree differencesTrigram index for ILIKE patterns not working as expectedWhy is mysql using the wrong index for order by query?






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I was reading about predicates being indexable or stageable then i found out that AND is indexable and OR is not indexable. why?

I cant't find the reason why AND and OR behave like this. I tried to understand with an example but I got more confused.

can someone explain this with an example?









share





























    0















    I was reading about predicates being indexable or stageable then i found out that AND is indexable and OR is not indexable. why?

    I cant't find the reason why AND and OR behave like this. I tried to understand with an example but I got more confused.

    can someone explain this with an example?









    share

























      0












      0








      0








      I was reading about predicates being indexable or stageable then i found out that AND is indexable and OR is not indexable. why?

      I cant't find the reason why AND and OR behave like this. I tried to understand with an example but I got more confused.

      can someone explain this with an example?









      share














      I was reading about predicates being indexable or stageable then i found out that AND is indexable and OR is not indexable. why?

      I cant't find the reason why AND and OR behave like this. I tried to understand with an example but I got more confused.

      can someone explain this with an example?







      index query





      share












      share










      share



      share










      asked 3 mins ago









      BlackCrystalBlackCrystal

      1014




      1014






















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