Re: Very slow query when too many joins
Posted by:
As Os
Date: June 06, 2016 03:33AM
I 'm trying to understand what is EAV: I found this on stackexchanege:
CLASSIC TABLE STRUCTURE
one column per attribute
ID...Ht_cm...wt_kg.....Age_yr
1........190......82.........43
2........170......60.........22
3........205......90.........51
EAV
one column for all attributes
ID.....Metric....Value
1......Ht_cm......190
1......Wt_kg.......82
1......Age_yr......43
1..................
2......Ht_cm......170
2......Wt_kg.......60
2......Age_yr......22
2..................
3......Ht_cm......205
3......Wt_kg.......90
3......Age_yr......51
3..................
Is this what you mean?
you 're saying that my table 'fields_values' has EAV structure and I should change it to classic table structure?
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Re: Very slow query when too many joins
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