Jack Orenstein wrote:
If x is an integer column with an index, then select ... from T where x > 1 and select ... from T where x > 1000000000could be optimized differently. So how is optimization done for a prepared statement containing a variable, e.g.select ... from T where x > $1
http://www.postgresql.org/docs/current/static/sql-prepare.html#AEN58703 explains this.
If your parameter is a unique key, then you won't see any difference. If your parameter is a non-unique key, there may be differences depending on your data/distribution etc.
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