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±ítable 

  A B
  12*2+10*5
  4*3+10*4
  15*2+81*4

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--search
SQL code:
select left(b,charindex('*',b)-1) from table where left(b,charindex('*',b)-1)


--update

SQL code:
update table
set a = left(b,charindex('*',b)-1) from table where left(b,charindex('*',b)-1)


select left(b,charindex('*',b)-1) from table where left(b,charindex('*',b)-1) > 0


update table set a = left(b,charindex('*',b)-1) from table where left(b,charindex('*',b)-1) > 0


SQL code:

update ±ítable set A=left(B,charindex('*',B)-1)


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