It's nor right way to go about it

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>I want to add to the UPDATE command (used with SQL Server) an expression that would be included only if the table has a certain field/column. For example, in VFP I would probably do it as following:
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>cUpdateCommand = "UPDATE " + cTableName + " SET FieldName = " + cNewValue + " WHERE FieldName = " + cOldValue + ;
>  IIF( FSIZE('FieldB') > 0 ," AND FieldB = " + SomeValue, "")
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>How do you change the above to make it work for SQL Server?
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>TIA.