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SQL Language Extension: ORDER BY clause can specify expressions and nulls placement Syntax ======== SELECT ... FROM .... ORDER BY order_list ....; order_list : order_item [, order_list]; order_item : <expression> [order_direction] [nulls_placement] order_direction : ASC | DESC; nulls_placement : NULLS FIRST | NULLS LAST; The ORDER BY clause lets you specify any valid expressions to sort query results. If expression is consisted of a single number it is interpreted as column number. The nulls_placement clause controls ordering of nulls in result set. They can be sorted either above (NULLS FIRST) or below (NULLS LAST) of all other values. Behaviour when nulls_placement is unspecified is NULLS FIRST. Author: Nickolay Samofatov <skidder@bssys.com> N O T E S ========= - If you override the default nulls placement, no index can be used for sorting. That is, no index will be used for an ASCENDING sort if NULLS LAST is specified, nor for a DESCENDING sort if NULLS FIRST is specified. - Results are undefined if you ask engine to sort results using non-deterministic UDF or stored procedure. - Amount of procedure invocations is undefined if you ask engine to sort results using UDF or stored procedure in any case even if you reference column calling procedure by number - You can use only numbers to reference columns to sort unions Examples ======== A) SELECT * FROM MSG ORDER BY PROCESS_TIME DESC NULLS FIRST B) SELECT FIRST 10 * FROM DOCUMENT ORDER BY STRLEN(DESCRIPTION) DESC C) SELECT DOC_NUMBER, DOC_DATE FROM PAYORDER UNION ALL SELECT DOC_NUMBER, DOC_DATA FROM BUDGORDER ORDER BY 2 DESC NULLS LAST, 1 ASC NULLS FIRST