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which must faster?



select col1, col2, (select col3 from tableb t2 where t2.colx = t1.colx) as co3

from tablea t1



or



select t1.col1, t1.col2, t2.col3

from tablea t1 leftjoin tableb t2 on t1.colx = t2.colx





which query will result to a faster execution?Let say the colx is index. Will the difference bevery big in a large dataset?



by the way do we call the first query as embeded select or nested select or sub select?



thanks





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