Updating Sort Order on a field?

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hi

i have customer table. displaying them in sorted order. have added 1 field call sortid.
now when ever if add new entry ...i want sort , want assign sorted that.

ex:

aaaa > 1
bbb > 2
ccc > 3

if add aaa1 ..then sort has become 2 , goes one....

how update this...using , update command....

thx in adv.

what doing sortid field can't whatever field contains aaaa, aaa1, etc?


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