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Association query a small table. Does it affect performance (MySQL)

Source: Internet
Author: User
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Specific statements 
Selectdfm.id,dfm.member_code,dfm.member_name,dfm.recommend_code,dfm.member_rank,dfm.create_time,dfm.account, Dfm.have_account,dfm.member_img,dfmr.rank_name,dfmr.grade_commission_ratio,dfm1.member_name as Recommendnamefromd_fx_member Dfmleft join D_fx_member_rank dfmr on dfm.member_rank = dfmr.rankleft Join D_fx_member dfm1 O N Dfm.recommend_code = Dfm1.member_codeWHEREdfm.member_code = ' zqy04 '

Human Moon Myth: This has no effect as long as the amount of data does not exceed 10w

People's Month Myth: enlarge the cache OK

Association query a small table. Does it affect performance (MySQL)

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