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Oracle WMSYS.WM_CONCAT(COLUMN)

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Oracle WMSYS.WM_CONCAT(COLUMN)

        WMSYS.WM_CONCAT(COLUMN)实现字段合并.

       eg:SELECT TO_CHAR(WMSYS.WM_CONCAT(DISTINCT E)OVER(PARTITION BY A,B,C,D)) E FROM AA;

            

        将BIN栏位按照A,B,C,D分组合并.合并之后的格式是以逗号分隔(比如:E1,E2,E3).

        在最外面使用TO_CHAR()是因为如果不使用TO_CHAR(),那么返回的值是"<CLOB>".

        返回<CLOB>,是因为E栏位的数据类型是varchar2类型,而WMSYS.WM_CONCAT(COLUMN)在Oracle 10g是一 个CLOB类型.

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Oracle WMSYS.WM_CONCAT(COLUMN)

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