Delete COLUMN data

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Hello all,

I need to DELETE all the DATA from 3 columns in my table...what is the BEST
way to handle this???  I don't want to DROP the columns just clear out ALL
the data in those 3 fields...

Thanks...Michelle
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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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