Question

In java :

Date d[] = new Date[2];
Date temp[] = {new Date(),new Date()};

In Oracle

temp date = (sysdate,sysdate);--it works 

but how to define size of temp as 2 as we do in java code.

Answer 1

I’m not quite sure that I understand the question. You’ve tagged it for PL/SQL so I assume that your “in Oracle” code is intended to be syntactically correct PL/SQL code but what you’ve posted isn’t valid syntax.

In PL/SQL, you have three different types of collections. You have nested tables, associative arrays, and varrays. You do not declare a size for nested tables or associative arrays at compile time– they will use whatever space they need. You do declare a size for varrays at compile time so you can declare a varray that stores two dates. I can’t envision a case where I would ever want to declare a varray of size 2 rather than using a nested table, though, since you get no benefit from limiting yourself to a 2 element collection. If you want to, though, you can declare the varray as I do below.

SQL> ed
Wrote file afiedt.buf

  1  declare
  2    -- Nested table
  3    type date_nt is table of date;
  4    -- Associative array
  5    type date_aa is table of date index by pls_integer;
  6    -- VArray
  7    type date_va is varray(2) of date;
  8    l_date_nt date_nt := date_nt( sysdate, sysdate );
  9    l_date_va date_va := date_va( sysdate, sysdate );
 10    l_date_aa date_aa;
 11  begin
 12    l_date_aa(1) := sysdate;
 13    l_date_aa(100) := sysdate;
 14* end;
 15  /

PL/SQL procedure successfully completed.