I am banging my head over this. I want to select distinct values from a varchar column and iterate through the values.
I want to select the distinct values from this column and loop through them (using as a variable) in a raise notice statement and also in an update statement.
I have not been able to do this trying dozens of different approaches. I could not find an example even after searching google.
So for example, suppose table: mytable has a column "value" that is defined as a varchar:
for tmp_var in select distinct(value) from mytable where value2='literal'
loop
raise notice 'I want to print a message here - the tmp_var is [' || tmp_var || ']'; <== error on this line
update table set somecolumn = ''' || tmp_var || '''
end loop;
I want to use each distinct value in a "raise notice" line and an update statement.
tmp_var has to be in ' ' ticks or will not work. it is failing on the first FOR statement stating: "invalid input syntax for integer: "some_distinct_value".
How do I select varchar distinct values and iterate using variables in a raise notice statement and inside another update statement?
this seems simple to do , but have not found a way.