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SQLize.online is a free online SQL environment for quickly running, experimenting with and sharing code.
You can run your SQL code on top of the most popular RDBMS including MySQL, MariaDB, SQLite, PostgreSQL, Oracle and Microsoft SQL Server.
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create table arr1( k integer[]); insert into arr1 VALUES('{700,1200,1700,100,900}'); insert into arr1 VALUES('{985,129,680,348,0,808,295}'); create or replace function foxes_in_array(arr int[]) returns int as $$ declare lval int := 0; nval int; sval int := 0; x int; begin foreach x in array $1 loop if lval=0 then lval=x; elsif lval<x then nval=x-lval; lval=x; sval=sval+nval; elsif lval>x then lval=x; end if; end loop; return sval; end; $$ language 'plpgsql'; select foxes_in_array(k), ( WITH dat AS ( SELECT CASE WHEN v > LAG(v) OVER w THEN v - LAG(v) OVER w ELSE 0 END AS res FROM unnest(k) WITH ORDINALITY AS u(v, n) WINDOW w AS (ORDER BY n) ) SELECT COALESCE(SUM(res), 0) FROM dat ) AS correct_res from arr1;
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