V$RESERVED_WORDS

V$RESERVED_WORDS displays a list of all SQL keywords. To determine whether a particular keyword is reserved in any way, check the RESERVED, RES_TYPE, RES_ATTR, and RES_SEMI columns.

Column	Datatype	Description
`KEYWORD`	`VARCHAR2(30)`	Name of the keyword
`LENGTH`	`NUMBER`	Length of the keyword
`RESERVED`	`VARCHAR2(1)`	Indicates whether the keyword cannot be used as an identifier (`Y`) or whether the keyword is not reserved (`N`)
`RES_TYPE`	`VARCHAR2(1)`	Indicates whether the keyword cannot be used as a type name (`Y`) or whether the keyword is not reserved (`N`)
`RES_ATTR`	`VARCHAR2(1)`	Indicates whether the keyword cannot be used as an attribute name (`Y`) or whether the keyword is not reserved (`N`)
`RES_SEMI`	`VARCHAR2(1)`	Indicates whether the keyword is not allowed as an identifier in certain situations, such as in DML (`Y`) or whether the keyword is not reserved (`N`)
`DUPLICATE`	`VARCHAR2(1)`	Indicates whether the keyword is a duplicate of another keyword (`Y`) or whether the keyword is not a duplicate (`N`)