UPDATE ─┬─> table-name ─┬─┬─────>───────────────┬─┐
         └─> view-name ──┘ └─> correlation-name ─┘ │
   ┌───────────────────────────────────────────────┘
   └─> 
S
E
T ─┬─> column-name = ─┬─> value-expr ─┬─┬─┐
            │                  └─> typebox (N)typebox (U)typebox (L)typebox (L) ───────┘ │ │
            └────────────── , <──────────────────┘ │
   ┌──────────────────────────<────────────────────┘
   └┬──────────────────>─────────────────────┬───────> typebox (;)
    └─> 
W
H
E
R
E ─┬─> predicate ──────────────┬─┘
               └─> 
C
U
R
R
E
N
T 
O
F cursor-name ─┘

Additional information available:

SETWHERE

More Information

 The UPDATE statement modifies a row or rows in a table or view.

 The SET clause specifies which columns in the table or view get
 what values.  For each column you want to modify, you must
 specify the column name and either a value expression or the
 NULL keyword.  SQL assigns the value following the equal sign to
 the column preceding the equal sign.

 The WHERE clause specifies the rows of the target table or view
 that will be modified according to the values indicated in the
 SET clause.  If you omit the WHERE clause, SQL modifies all rows
 of the target table or view.  You can either specify a predicate
 or a cursor name in the WHERE clause.

 If the WHERE clause includes a predicate, all the rows of the
 target table for which the predicate is true are modified.  The
 columns named in the predicate must be columns of the target
 table or view.  The target table cannot be named in a column
 select expression within the predicate.

 If the WHERE clause uses CURRENT OF cursor-name, SQL modifies
 only the row on which the named cursor is positioned.