The outputs (values) following queries are equal?

Are the outputs (values) of the following explains equal of queries by Oracle?
SQL> select to_char(sysdate+1/24,'yymmddhh24') from dual;

TO_CHAR(
--------
09081513

SQL> select to_char(sysdate, 'yymmddhh24miss') from dual;

TO_CHAR(SYSD
------------
090815130000

I think it's good.

Tags: Database

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FROM TEST
)
SELECT per_pk,
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FROM src
WHERE a_date = latest_date
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;

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---------------------- ---------------------- ------------------------- ----------------------
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8                      6                      2010/10/22                5

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    1val1
    2val2
    3val3


    The question is how we can use 'level 1' as a fourth parameter of regexp_substr in connect by if clause level value starts with 1?

    It seems to level 1 is equal to zero then, and the query is to break. In addition the following query

     select regexp_substr('val1;val2;val3', ';', 1,0) from dual

    Indeed falls with the error message

    ORA-01428: argument '0' is out of range

    Finally if I change the level setting, it works as expected assuming that level value starts with 1

       SELECT level, regexp_substr(value, '[^;]+', 1, level) col
            FROM (SELECT 'val1;val2;val3' value FROM dual  ) 
            CONNECT BY regexp_substr(value, ';', 1,level) is not null

    LEVEL COL
    1val1
    2val2

    Hope someone can explain to me how it works or share a link to the description of this query processing.

    You need to look at the complete picture. Hierarchical queries have 2 START WITH and CONNECT BY clauses. START WITH may be explicit or implicit. Implicit START WITH means build the hierarchy from each line. In any case LEVEL = 1 is to START WITH the line. LEVEL 1 > are generated by CONNECT BY. So LEVEL = 1 is produced independently CONNECT BY conditions. Hope it answers your question.

    SY.

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