How do you find value of first column before inserting value into the second co

How do you find value of first column before inserting value
into the second column in the same table for checking that second column must have different value than first column.

Question Posted / satish

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How do you find value of first column before inserting value into the second column in the same tab..

Answer / ankita upadhyay

by using lookup function
syntax-
LOOKUP(lookup_value,lookup_vector);

lookup_value-contain the name of field(like id) about which you have to find info

lookup_vector-contain a range of row or column which contain value of respective ids

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How do you find value of first column before inserting value into the second column in the same tab..

Answer / satish

Please help me.
Does we write trigger.
Or procedure or
anything else.

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