sql - How to get the difference in different rows within a categories in the below table? PSQL -


enter image description here

i want ****compute diff**** , return rows have diff>2

i don't have index column in table , not allowed add index in table because temporary table

i psql beginner. helps appreciate

thanks

you can use window functions: https://www.postgresql.org/docs/9.6/static/functions-window.html

create table temp1(     client integer,     value integer );  insert temp1 values    (100,2), (100,5), (100,5), (102,2), (102,3);  select client, value,         lead(value) on (partition client order value) - value diff   temp1   order client, value;

you can try at: http://rextester.com/gbkz11796


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