assignment-clause::

1.0+ ,
1.0 column-name  = 
1.0.1 expression
1.0.1 NULL
1.0.1 DEFAULT
1.0 (
1.0.1+ ,
1.0.1 column-name
1.0.2 )  =  (
1.0.2.1.0.0+ ,
1.0.2.1.0.0 expression
1.0.2.1.0.0 NULL
1.0.2.1.0.0 DEFAULT
1.0.2.1.0 row-fullselect
1.0.2.1.1 )
1 ROW  =  (
1.1.0.0+ ,
1.1.0.0 expression
1.1.0.0 NULL
1.1.0.0 DEFAULT
1.1.0 row-fullselect
1.1.1 )