{ CHARACTER [VARYING] ( size )
| { CHAR | NCHAR } VARYING ( size )
| VARCHAR ( size )
| NATIONAL { CHARACTER | CHAR } [VARYING] ( size )
| { NUMERIC | DECIMAL | DEC } [( precision [, scale] )]
| { INTEGER | INT | SMALLINT }
| FLOAT [( size )]
| DOUBLE PRECISION
| REAL
}