The spacing of the gobo and the lens may be varied to alter the size and focus of the image. A gobo in a gobo holder, which goes in a stage lighting instrument. The discolored portion is oxidation of the stainless steel caused by the high temperature of the lamp, but the gobo is still usable.he spacing of the gobo and the lens may be varied to alter the size and focus of the image. A gobo in a gobo holder, which goes in a stage lighting instrument. The discolored portion is oxidation of the stainless steel caused by the high temperature of the lamp, but the gobo is still usable.
The column â%.*lsâ cannot be modified because it is either a computed column or is the result of a UNION operator. The column â%.*lsâ cannot be modified because it is either a computed column or is the result of a UNION operator.
A computed column is the column where insert or updated data depend on the other column values in the same table and can be come by an expression or filter. We cannot insert explicitly defined value into computed column. We can say computed column worked as a virtual column and can be use this as pre calculated value. Computed Column Expression defined as combination of other Non-Computed column, variables, constant and function in the same table. It cannot use be a sub query, query processor canât use output columns as input columns. So in other word it is not possible to reference the column alias defined at the same level.