sql - Not able to left join two tables using a non numeric column? ora-01722 -

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i check, possible left join 2 tables using non numeric column?

i.e. descriptions_cd varchar(10) , table_cd varchar(10):

   select *       descriptions d  left join tables t on t.table_cd = d.descriptions_cd;

this sql seems giving ora-01722 error. in oracle 9i.

can check values of 1 of these column contain numeric data (even if volumn type varchar) ?


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