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.
Restrictions on the Set Operators The set operators are subject to the following restrictions: 1  The set operators are not valid on columns of type BLOB, CLOB, BFILE, VARRAY, or nested table. 2  The UNION, INTERSECT, and MINUS operators are not valid on LONG columns. If the select list preceding the set operator contains an expression, then you must provide a column alias for the expression in order to refer to it in the order_by_clause. You cannot also specify the for_update_clause with the set operators.