Oracle query can't return a row even if the parameter should return a row -

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i have tmp_table field receiving_institution(varchar2) . not provide other fields make simple.

    receiving_institution|     ----------------------     19     26     50     etc.      select * tmp_table receiving_institution = '19' -> returns 0 row(unexpected result)     select * tmp_table receiving_institution '%19%' -> returns row(expected result)

the second query's result return receiving_institution '19' (no spaces). when edit manually '19' '19' typing it, after first query works. think it's on data itself. way test on main table (autho_activity) , it's same result.


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