[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] [Y] nested tables  NEW_TIME function  NEXT_DAY Function  nodes     hierarchical queries      leaf, finding      root         finding          finding parents          listing  non-equi self joins  non-equi-joins compared to equi-joins  noncorrelated subqueries      multiple-column      multiple-row      overview      scalar  nonprocedural languages  NOT BETWEEN operator  NOT IN operator      multiple-row subqueries  NOT operator     pattern-matching and      WHERE clause  NTILE analytic function  NULL expression  NULL values      aggregate functions      analytic ranking functions      compound queries      GROUP BY clause      NVL function compared to GROUPING function      testing for  numbers, converting to dates  2nd  NUMTODSINTERVAL function  NUMTOYMINTERVAL function  NVL function      averages      NULL values, compared to GROUPING function      syntax  2nd  NVL2 function, syntax  2nd