mysql update query in the indexed table

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One of my table having combintaion of primary key, both i did index for that table.

EX: TableName -> StudentMark

Primay Key -> ClassName, RollNo (Both are i set index)

Now i am doing the query

Update StudentMark set name ='XXX' where ClassName ="X" and RollNo = 1

Update StudentMark set name ='XXX' where RollNo = 1 and ClassName ="X"

which query is proper. because i did the index classname, rollno.

Posted 20-Feb-13 22:35pm

@BangIndia

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MalwareTrojan · Answer 1 · 2013-02-20T23:04:00

Your table structure is wrong. Table should have only 1 Primary Key with datatype Number/Numeric.
If other Columns you want to have different values then give constraint a "Unique".

Plz know basic concept of Primary Key & Unique Key before implementing.
Primary Key is having indexes by default.

Thanking you meanwhile, Vardhan Desai.