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In PL/SQL, you can create collections to store multiple values of the same datatype. There are three main types of collections in PL/SQL: associative arrays (also known as index-by tables), nested tables, and VARRAYs (variable-size arrays). VARRAY These are one-dimensional arrays with a fixed upper bound, specified at declaration. They are useful when you know the maximum number of elements that will be stored in the array. DECLARE TYPE num_array IS VARRAY(5) OF NUMBER; numbers num_array := num_array(10, 20, 30, 40, 50); total NUMBER := 0; BEGIN -- Loop through the VARRAY FOR i IN 1..numbers.COUNT LOOP total := total + numbers(i); END LOOP; DBMS_OUTPUT.PUT_LINE('Total sum: ' || total); END; NESTED TABLE These are one-dimensional arrays with no upper bounds. They are declared using the TYPE statement and instantiated with the CREATE TYPE statement. They behave similar to database tables and can be used in SQL oper