how to get the substring from the column value

HI Experts,

how to get the substring from the below query

SELECT ADD_MONTHS(TRUNC (LAST_DAY (SYSDATE)), -2)+1 start_date FROM DUAL
//01-AUG-18
expected o/p: AUG-18
LVL 2
srikoteshAsked:
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Kent OlsenDBACommented:
Hi srikotesh,

In Oracle, the easiest way to format a date string is with the TO_CHAR function.

SELECT TO_CHAR(ADD_MONTHS(TRUNC (LAST_DAY (SYSDATE)), -2)+1, 'MMM-DD') start_date FROM DUAL
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OMC2000Commented:
I guess you need year:
SELECT to_char(ADD_MONTHS(TRUNC (LAST_DAY (SYSDATE)), -2)+1, 'MON-YY') start_date FROM DUAL

not day
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Kent OlsenDBACommented:
SELECT TO_CHAR(ADD_MONTHS(TRUNC (LAST_DAY (SYSDATE)), -2)+1, 'MON-DD') start_date FROM DUAL

Apologies....
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awking00Information Technology SpecialistCommented:
select to_char(add_months(trunc(sysdate,'mm'),-1),'MON-RR') from dual;
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srikoteshAuthor Commented:
how to give alias name to this query


SELECT to_char(ADD_MONTHS(TRUNC (LAST_DAY (SYSDATE)), -2)+1, 'MON-YY') start_date FROM DUAL

SELECT to_char(ADD_MONTHS(TRUNC (LAST_DAY (SYSDATE)), -2)+1, 'MON-YY') start_date FROM DUAL  as year
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OMC2000Commented:
select 'abc' as astring,
(SELECT to_char(ADD_MONTHS(TRUNC (LAST_DAY (SYSDATE)), -2)+1, 'MON-YY') start_date FROM DUAL) as year from dual
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