SELECT, INSERT and UPDATE.
On the other hand, non-reserved keywords have special meanings only in specific context and can be used as identifiers in other situations.  For example, the keyword DB is non-reserved, meaning you can use it directly to name a database.
The table below lists all available keywords that you can use in statements:
 Keyword   |  Oxla Status    | 
|---|---|
| ABSOLUTE | non-reserved | 
| ACTION | non-reserved | 
| ADD | non-reserved | 
| AFTER | non-reserved | 
| AGGREGATE | non-reserved | 
| ALL | reserved | 
| ALLOCATE | reserved | 
| ALTER | non-reserved | 
| ANALYSE | reserved | 
| ANALYZE | reserved | 
| AND | reserved | 
| ANY | reserved | 
| ANY_VALUE | non-reserved | 
| ARE | reserved | 
| ARRAY | reserved, requires AS | 
| ARRAY_MAX_CARDINALITY | non-reserved | 
| AS | reserved, requires AS | 
| ASC | reserved | 
| ASENSITIVE | non-reserved | 
| ASSERTION | non-reserved | 
| ASSIGNMENT | non-reserved | 
| ASYMMETRIC | reserved | 
| AT | non-reserved | 
| ATOMIC | non-reserved | 
| AUTHORIZATION | reserved (can be function or type) | 
| AVG | non-reserved | 
| BEFORE | non-reserved | 
| BEGIN | non-reserved | 
| BEGIN_FRAME | non-reserved | 
| BEGIN_PARTITION | non-reserved | 
| BETWEEN | non-reserved (cannot be function or type) | 
| BIGINT | non-reserved (cannot be function or type) | 
| BIT | non-reserved (cannot be function or type) | 
| BIT_LENGTH | reserved | 
| BLOB | non-reserved | 
| BOOL | non-reserved | 
| BOOLEAN | non-reserved (cannot be function or type) | 
| BOTH | reserved | 
| BY | non-reserved | 
| CACHE | non-reserved | 
| CALL | reserved | 
| CALLED | reserved | 
| CARDINALITY | non-reserved | 
| CASCADE | reserved | 
| CASCADED | reserved | 
| CASE | reserved | 
| CAST | reserved | 
| CATALOG | non-reserved | 
| CEILING | non-reserved | 
| CHAR | non-reserved | 
| CHAR_LENGTH | non-reserved | 
| CHARACTER | non-reserved | 
| CHARACTER_LENGTH | non-reserved | 
| CHECK | reserved | 
| CLASSIFIER | non-reserved | 
| CLOB | non-reserved | 
| CLOSE | reserved | 
| COALESCE | reserved | 
| COLLATE | reserved | 
| COLLATION | reserved | 
| COLLECT | non-reserved | 
| COLUMN | reserved | 
| COLUMNS | non-reserved | 
| COMMIT | reserved | 
| CONDITION | reserved | 
| CONNECT | reserved | 
| CONNECTION | reserved | 
| CONSTRAINT | reserved | 
| CONSTRAINTS | non-reserved | 
| CONTAINS | non-reserved | 
| CONTINUE | reserved | 
| CONTROL | non-reserved | 
| CONVERT | non-reserved | 
| COPY | non-reserved | 
| CORR | non-reserved | 
| CORRESPONDING | reserved | 
| COVAR_POP | non-reserved | 
| COVAR_SAMP | non-reserved | 
| CREATE | reserved | 
| CROSS | reserved | 
| CUBE | reserved | 
| CUME_DIST | non-reserved | 
| CURRENT | reserved | 
| CURRENT_USER | reserved | 
| CURRENT_ROLE | reserved | 
| CURSOR | reserved | 
| CYCLE | reserved | 
| DATABASE | non-reserved | 
| DATABASES | non-reserved | 
| DATALINK | non-reserved | 
| DATE | non-reserved | 
| DATETIME | non-reserved | 
| DAY | non-reserved | 
| DEALLOCATE | reserved | 
| DEC | non-reserved | 
| DECFLOAT | non-reserved | 
| DECIMAL | non-reserved | 
| DECLARE | reserved | 
| DEFAULT | reserved | 
| DEFERRABLE | reserved | 
| DEFERRED | reserved | 
| DEFINE | non-reserved | 
| DELETE | reserved | 
| DELTA | non-reserved | 
| DENSE_RANK | non-reserved | 
| DEREF | non-reserved | 
| DESC | reserved | 
| DESCRIBE | reserved | 
| DESCRIPTOR | reserved | 
| DETERMINISTIC | reserved | 
| DIAGNOSTICS | reserved | 
| DIRECT | non-reserved | 
| DISCONNECT | reserved | 
| DISTINCT | reserved | 
| DLNEWCOPY | non-reserved | 
| DLPREVIOUSCOPY | non-reserved | 
| DLURLCOMPLETE | non-reserved | 
| DLURLCOMPLETEONLY | non-reserved | 
| DLURLCOMPLETEWRITE | non-reserved | 
| DLURLPATH | non-reserved | 
| DLURLPATHONLY | non-reserved | 
| DLURLPATHWRITE | non-reserved | 
| DLURLSCHEME | non-reserved | 
| DLURLSERVER | non-reserved | 
| DLVALUE | non-reserved | 
| DO | reserved | 
| DOMAIN | non-reserved | 
| DOUBLE | non-reserved | 
| DROP | reserved | 
| DYNAMIC | non-reserved | 
| EACH | reserved | 
| ELEMENT | non-reserved | 
| ELSE | reserved | 
| EMPTY | non-reserved | 
| END | reserved | 
| END_FRAME | non-reserved | 
| END_PARTITION | non-reserved | 
| EQUALS | non-reserved | 
| ESCAPE | reserved | 
| EVERY | reserved | 
| EXCEPT | reserved | 
| EXCEPTION | reserved | 
| EXEC | reserved | 
| EXECUTE | reserved | 
| EXISTS | reserved | 
| EXP | non-reserved | 
| EXPLAIN | reserved | 
| EXTERNAL | reserved | 
| EXTRACT | reserved | 
| FALSE | reserved | 
| FETCH | reserved | 
| FILE | non-reserved | 
| FILTER | reserved | 
| FIRST | reserved | 
| FIRST_VALUE | non-reserved | 
| FLOAT | non-reserved | 
| FLOOR | non-reserved | 
| FOR | reserved | 
| FOREIGN | reserved | 
| FORMAT | non-reserved | 
| FOUND | non-reserved | 
| FRAME_ROW | non-reserved | 
| FREE | non-reserved | 
| FROM | reserved | 
| FULL | reserved | 
| FUNCTION | reserved | 
| FUSION | non-reserved | 
| GET | non-reserved | 
| GLOBAL | reserved | 
| GO | non-reserved | 
| GOTO | non-reserved | 
| GRANT | reserved | 
| GROUP | reserved | 
| GROUPING | reserved | 
| GROUPS | non-reserved | 
| HASH | non-reserved | 
| HAVING | reserved | 
| HINT | non-reserved | 
| HOLD | non-reserved | 
| HOUR | non-reserved | 
| IDENTITY | reserved | 
| IF | reserved | 
| ILIKE | non-reserved | 
| IMMEDIATE | reserved | 
| IMPORT | non-reserved | 
| IN | reserved | 
| INDEX | reserved | 
| INDICATOR | reserved | 
| INITIAL | reserved | 
| INITIALLY | reserved | 
| INNER | reserved | 
| INOUT | reserved | 
| INPUT | reserved | 
| INSENSITIVE | reserved | 
| INSERT | reserved | 
| INT | non-reserved | 
| INTEGER | non-reserved | 
| INTERSECT | reserved | 
| INTERSECTION | non-reserved | 
| INTERVAL | reserved | 
| INTO | reserved | 
| IS | reserved | 
| ISNULL | non-reserved | 
| ISOLATION | reserved | 
| JOIN | reserved | 
| JSON | non-reserved | 
| JSON_ARRAY | non-reserved | 
| JSON_ARRAYAGG | non-reserved | 
| JSON_EXISTS | non-reserved | 
| JSON_OBJECT | non-reserved | 
| JSON_OBJECTAGG | non-reserved | 
| JSON_QUERY | non-reserved | 
| JSON_TABLE | non-reserved | 
| JSON_TABLE_PRIMITIVE | non-reserved | 
| JSON_VALUE | non-reserved | 
| JSONB | non-reserved | 
| KEY | non-reserved | 
| LAG | non-reserved | 
| LANGUAGE | reserved | 
| LARGE | non-reserved | 
| LAST | reserved | 
| LAST_VALUE | non-reserved | 
| LATERAL | reserved | 
| LEAD | non-reserved | 
| LEADING | reserved | 
| LEFT | reserved | 
| LEVEL | non-reserved | 
| LIKE | reserved | 
| LIKE_REGEX | non-reserved | 
| LIMIT | reserved | 
| LISTAGG | non-reserved | 
| LN | non-reserved | 
| LOAD | non-reserved | 
| LOCAL | reserved | 
| LOCALTIME | reserved | 
| LOCALTIMESTAMP | reserved | 
| LONG | non-reserved | 
| MEASURES | non-reserved | 
| MEMBER | non-reserved | 
| MERGE | reserved | 
| METHOD | non-reserved | 
| MINUS | reserved | 
| MINUTE | non-reserved | 
| MODIFIES | reserved | 
| MODULE | non-reserved | 
| MONTH | non-reserved | 
| MULTISET | non-reserved | 
| NAMES | non-reserved | 
| NATIONAL | non-reserved | 
| NATURAL | reserved | 
| NCHAR | non-reserved | 
| NCLOB | non-reserved | 
| NEW | reserved | 
| NEXT | non-reserved | 
| NO | reserved | 
| NONE | non-reserved | 
| NOT | reserved | 
| NTILE | non-reserved | 
| NULL | reserved | 
| NULLIF | reserved | 
| NULLS | reserved | 
| NVARCHAR | non-reserved | 
| OCCURRENCES_REGEX | non-reserved | 
| OCTET_LENGTH | non-reserved | 
| OF | reserved | 
| OFF | non-reserved | 
| OFFSET | reserved | 
| OLD | reserved | 
| OMIT | non-reserved | 
| ON | reserved | 
| ONE | non-reserved | 
| ONLY | reserved | 
| OPEN | reserved | 
| OPTION | reserved | 
| OR | reserved | 
| ORDER | reserved | 
| OUT | reserved | 
| OUTER | reserved | 
| OUTPUT | reserved | 
| OVER | reserved | 
| OVERLAPS | reserved | 
| OVERLAY | non-reserved | 
| PAD | non-reserved | 
| PARAMETER | reserved | 
| PARAMETERS | non-reserved | 
| PARTIAL | reserved | 
| PARTITION | reserved | 
| PATTERN | non-reserved | 
| PER | non-reserved | 
| PERCENT | non-reserved | 
| PERCENT_RANK | non-reserved | 
| PERCENTILE_CONT | non-reserved | 
| PERCENTILE_DISC | non-reserved | 
| PERIOD | reserved | 
| PERMUTE | non-reserved | 
| PLACING | non-reserved | 
| PLAN | non-reserved | 
| PORTION | non-reserved | 
| PRECEDES | non-reserved | 
| PRECISION | reserved | 
| PREPARE | reserved | 
| PRESERVE | reserved | 
| PRIMARY | reserved | 
| PRIOR | reserved | 
| PRIVILEGES | non-reserved | 
| PROCEDURE | reserved | 
| PTF | non-reserved | 
| PUBLIC | reserved | 
| RANGE | reserved | 
| READ | reserved | 
| READS | reserved | 
| REAL | non-reserved | 
| RECURSIVE | reserved | 
| REF | reserved | 
| REFERENCES | reserved | 
| REFERENCING | reserved | 
| REGR_AVGX | non-reserved | 
| REGR_AVGY | non-reserved | 
| REGR_COUNT | non-reserved | 
| REGR_INTERCEPT | non-reserved | 
| REGR_R2 | non-reserved | 
| REGR_SLOPE | non-reserved | 
| REGR_SXX | non-reserved | 
| REGR_SXY | non-reserved | 
| REGR_SYY | non-reserved | 
| RELATIVE | non-reserved | 
| RELEASE | reserved | 
| RENAME | reserved | 
| RESTRICT | reserved | 
| RESULT | reserved | 
| RETURN | reserved | 
| RETURNS | reserved | 
| REVOKE | reserved | 
| RIGHT | reserved | 
| ROLLBACK | reserved | 
| ROLLUP | reserved | 
| ROW | reserved | 
| ROW_NUMBER | non-reserved | 
| ROWS | reserved | 
| RUNNING | non-reserved | 
| SAVEPOINT | reserved | 
| SCHEMA | reserved | 
| SCHEMAS | non-reserved | 
| SCOPE | reserved | 
| SCROLL | reserved | 
| SEARCH | non-reserved | 
| SECOND | non-reserved | 
| SECTION | non-reserved | 
| SEEK | non-reserved | 
| SELECT | reserved | 
| SENSITIVE | reserved | 
| SESSION | reserved | 
| SESSION_USER | reserved | 
| SET | reserved | 
| SHOW | non-reserved | 
| SIMILAR | non-reserved | 
| SIZE | non-reserved | 
| SKIP | non-reserved | 
| SMALLINT | non-reserved | 
| SOME | reserved | 
| SORTED | non-reserved | 
| SPACE | non-reserved | 
| SPATIAL | non-reserved | 
| SPECIFIC | reserved | 
| SPECIFICTYPE | non-reserved | 
| SQL | reserved | 
| SQLCODE | non-reserved | 
| SQLERROR | non-reserved | 
| SQLEXCEPTION | non-reserved | 
| SQLSTATE | non-reserved | 
| SQLWARNING | non-reserved | 
| START | reserved | 
| STATIC | reserved | 
| STDDEV_POP | non-reserved | 
| STDDEV_SAMP | non-reserved | 
| STRING | non-reserved | 
| SUBMULTISET | non-reserved | 
| SUBSET | non-reserved | 
| SUCCEEDS | non-reserved | 
| SYMMETRIC | reserved | 
| SYSTEM | reserved | 
| SYSTEM_TIME | non-reserved | 
| SYSTEM_USER | reserved | 
| TABLE | reserved | 
| TABLES | non-reserved | 
| TABLESAMPLE | reserved | 
| TEMPORARY | reserved | 
| TEXT | non-reserved | 
| THEN | reserved | 
| TIME | non-reserved | 
| TIMESTAMP | non-reserved | 
| TIMESTAMP_TRUNC | non-reserved | 
| TO | reserved | 
| TOP | non-reserved | 
| TRAILING | reserved | 
| TRANSACTION | reserved | 
| TRANSLATE | reserved | 
| TRANSLATE_REGEX | non-reserved | 
| TRANSLATION | non-reserved | 
| TREAT | reserved | 
| TRIGGER | reserved | 
| TRUE | reserved | 
| TRUNCATE | reserved | 
| UESCAPE | reserved | 
| UNION | reserved | 
| UNIQUE | reserved | 
| UNKNOWN | reserved | 
| UNLOAD | non-reserved | 
| UNMATCHED | non-reserved | 
| UNNEST | non-reserved | 
| UPDATE | reserved | 
| UPPER | non-reserved | 
| USAGE | reserved | 
| USER | non-reserved | 
| USING | reserved | 
| VALUES | reserved | 
| VAR_POP | non-reserved | 
| VAR_SAMP | non-reserved | 
| VARBINARY | non-reserved | 
| VARCHAR | non-reserved | 
| VARIADIC | reserved | 
| VARYING | reserved | 
| VERSIONING | non-reserved | 
| VIEW | reserved | 
| VIRTUAL | non-reserved | 
| WHEN | reserved | 
| WHENEVER | reserved | 
| WHERE | reserved | 
| WIDTH_BUCKET | non-reserved | 
| WINDOW | reserved | 
| WITH | reserved | 
| WITHIN | reserved | 
| WITHOUT | reserved | 
| WORK | reserved | 
| WRITE | non-reserved | 
| XML | non-reserved | 
| XMLAGG | non-reserved | 
| XMLATTRIBUTES | non-reserved | 
| XMLBINARY | non-reserved | 
| XMLCAST | non-reserved | 
| XMLCOMMENT | non-reserved | 
| XMLCONCAT | non-reserved | 
| XMLDOCUMENT | non-reserved | 
| XMLELEMENT | non-reserved | 
| XMLEXISTS | non-reserved | 
| XMLFOREST | non-reserved | 
| XMLITERATE | non-reserved | 
| XMLNAMESPACES | non-reserved | 
| XMLPARSE | non-reserved | 
| XMLPI | non-reserved | 
| XMLQUERY | non-reserved | 
| XMLSERIALIZE | non-reserved | 
| XMLTABLE | non-reserved | 
| XMLTEXT | non-reserved | 
| XMLVALIDATE | non-reserved | 
| YEAR | non-reserved | 
| ZONE | non-reserved |