sql nested table code example

Example 1: NESTED QUERY SQL

SELECT column_name [, column_name ]
FROM   table1 [, table2 ]
WHERE  column_name OPERATOR
   (SELECT column_name [, column_name ]
   FROM table1 [, table2 ]
   [WHERE])

Example 2: how to create nested table in sql

CREATE OR REPLACE TYPE my_tab_t AS TABLE OF VARCHAR2(30);
/
CREATE TABLE nested_table (id NUMBER, col1 my_tab_t)
       NESTED TABLE col1 STORE AS col1_tab;