Set Operators - Clarification needed

This is my query. I am executing this in HR Schema Oracle 11g.
SELECT HIRE_DATE, EMPLOYEE_ID, to_char(null) FROM EMPLOYEES WHERE LAST_NAME='Taylor'
UNION ALL
SELECT SYSDATE, TO_CHAR(NULL), 1+1 FROM DUALIt gives ORA-01790: expression must have same datatype as corresponding expression error. What data type is mismatching here? I don't seem to understand. HIRE_DATE and SYSDATE - DATE data type. Is something wring with my other two columns? I read that TO_CHAR(NULL) can be used for filling missing values. That's why I tried this way.
Any guidance, please?

Hi,
whenever you use set operators there has to be ont to one datatype correspondance of the columns you define in all the select statements.
Here the first select statement's employee_id number is conflicting with to_char(null) and to_char(null) is conflicting with 1+1.
Hence try out this
SELECT HIREDATE, Empno, to_char(null) FROM EMP WHERE ename='Taylor'
UNION ALL
SELECT SYSDATE, 1+1,TO_CHAR(NULL) FROM DUAL
or use
SELECT HIRE_DATE, EMPLOYEE_ID, to_NUMBER(null) FROM EMPLOYEE WHERE LAST_NAME='Taylor'
UNION ALL
SELECT SYSDATE, TO_NUMBER(NULL), 1+1 FROM DUAL

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Many of the commonly used base R functions are overloaded in the Oracle R Enterprise transparency layer to work with ore.frame objects. These functions are located in the OREbase and OREstats packages.
For example, to get the union, use merge, as it has been overloaded to operate on ore.frame objects:
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[1] "package:OREbase" "package:base"
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There is no need to pull the data if the function is overloaded to work with ore.frame objects. More examples can be found in the ORE 1.4 Training Materials: Oracle R Enterprise 1.4 Transparency Layer: http://www.oracle.com/technetwork/database/database-technologies/r/r-enterprise/learnmore/ore-1-4-transparency-layer-215…
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