On Thu, Sep 1, 2011 at 11:14 AM, Sim Zacks <s...@compulab.co.il> wrote: > On 09/01/2011 12:26 PM, Pavel Stehule wrote: >> >> Hello >> >> postgres=# create table tt(a int, b varchar); >> CREATE TABLE >> postgres=# insert into tt values(10,'hello'); >> INSERT 0 1 >> >> postgres=# select md5(array_to_string(array_agg(md5(tt::text)),'')) from I do that as well, but it might have questionable performance when your table has 16M rows, and is 50GB +
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