codeomnitrix codeomnitrix - 1 year ago 88
SQL Question

what is use of question mark in sql

I was just surfing the net and found a query something like:

sql = "select milk_rate from special_milk_rate
where code_producer_id=? and effective_from <= ?
and effective_till >= ?"

what exactly this query means i means what is the use of ? in this statement.

and one thing more what is use of & in sql.

Answer Source

This usually implies a prepared statement, where the parameters are filled in later. (see e.g.

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