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hi its Tim from Oracle base TomTom common this video is about collation this functionality was introduced in Oracle 12:2 and determines how strings are compared so it affects things like equality tests and sort operations in order for this to work we have to have extended datatypes enabled collation supported multiple levels but in these examples well just look at column and statement level collation we set the NLS Langhe environment variable to make sure our client displays all the characters properly to see the default behavior lets create a table with two string columns we populate it with four rows containing similar data only differing by case and accents notice the differences in the second character of the company column and the third character of the location column if we do an equality test well only get the Rose with the exact match on both case and accent in a group by operation each row will be seen as unique so we have four groups with one row in each group lets recr