SQL : MySQL: Difference between `... ADD INDEX(a); ... ADD INDEX(b);` and `... ADD INDEX(a,b);`?

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SQL : MySQL: Difference between `... ADD INDEX(a); ... ADD INDEX(b);` and `... ADD INDEX(a,b);`?
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SQL : MySQL: Difference between `... ADD INDEX(a); ... ADD INDEX(b);` and `... ADD INDEX(a,b);`?
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: ADD INDEX(a); ... INDEX(a,b);`? INDEX(b);` `... `... Difference SQL ADD and MySQL: ADD between



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