Check contrains in oracle

How to handle case senstive data in oracle by check contrains

I have a table which insert both upper and lower case data get inserted in my table

So, Now I need to insert only upper case in my table..

we have acheive it by the following query as mention below.

Alter Table Xxbkpi_Lookup

Add Constraint Xxbkpi_Lookup_Unq_Ck

Check (Lookup_Type = Upper(Lookup_Type) And

Lookup_Code= Upper(Lookup_Code))

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