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SQL> select ltrim('109224323','109') from dual;
LTRIM('109224323','109')
------------------------
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SQL> select ltrim('10900094323','109') from dual;
LTRIM('10900094323','109')
---------------------------
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SQL> select ltrim('10900111000991110224323','109') from dual;
LTRIM('10900111000991110224323
------------------------------
224323
SQL> select ltrim('109200111000991110224323','109') from dual;
LTRIM('10920011100099111022432
------------------------------
200111000991110224323
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SQL> select ltrim('902100111000991110224323','109') from dual;
LTRIM('90210011100099111022432
------------------------------
2100111000991110224323
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