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Leftmost prefix principle of index

2022-07-29 04:12:00 【Fanzongshen】

stay a,b,c Create a union index on three fields (a,b,c)
What statement will go index1 Index? ？

select * from table where a = '1'  
select * from table where a = '1' and b = ‘2’  
select * from table where a = '1' and b = ‘2’  and c='3'

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