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inner join and into corresponding fields performance,

hi ,

i am still not very clear about the performance aspect of inner join and into corresponding fields...

i know that corresponding fields affects memory peformance ..but does it affect database performance also ie can we have time_out in a select into corresponding fields?

also i am not still clear why inner join sometimes improves databse performance for eg i want to select from mkpf and then mseg i have all the key fields so should i go for fae and select individually or do a inner join....

i am rellay confused with these two points and very interested to understand these concepts...

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