Re: [SQL] avoid select expens_expr(col) like unneccessary calculations

2003-07-21 Thread Bruce Momjian
Stephan Szabo wrote: > On 8 Jul 2003, Markus Bertheau wrote: > > > when you have > > select expensive_expression(column), * from table offset 20 limit 40 > > > > can you somehow save the cost for the first 20 calculations of > > expensive_expression? > > Right now the only way I can think of that

Re: [SQL] avoid select expens_expr(col) like unneccessary calculations

2003-07-07 Thread scott.marlowe
On 8 Jul 2003, Markus Bertheau wrote: > Hi, > > when you have > select expensive_expression(column), * from table offset 20 limit 40 > > can you somehow save the cost for the first 20 calculations of > expensive_expression? Might a functional or partial index work here?

Re: [SQL] avoid select expens_expr(col) like unneccessary calculations

2003-07-07 Thread Stephan Szabo
On 8 Jul 2003, Markus Bertheau wrote: > when you have > select expensive_expression(column), * from table offset 20 limit 40 > > can you somehow save the cost for the first 20 calculations of > expensive_expression? Right now the only way I can think of that might work is to push the offset/limit

[SQL] avoid select expens_expr(col) like unneccessary calculations

2003-07-07 Thread Markus Bertheau
Hi, when you have select expensive_expression(column), * from table offset 20 limit 40 can you somehow save the cost for the first 20 calculations of expensive_expression? -- Markus Bertheau. Berlin, Berlin. Germany. ---(end of broadcast)--- TIP