DB2 多行一列字符串类型进行合并 |
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1.1: SELECT [分组的字段],LISTAGG([需要聚合的字段名], ',') WITHIN GROUP(ORDER BY [排序的字段名]) AS employees FROM [表名] GROUP BY [分组的字段名] ; --注意:需要DB2 9.7以后的版本才支持, 类似ORACLE的wmsys.wm_concat()
1.2:SELECT [分组的字段名] ,replace(replace(xml2clob(xmlagg(xmlelement(NAME a, [需要拼接的字段名]||','))),'',''),'',' ') FROM [表名] GROUP BY [分组的字段名]; -- DB2 9.7以前的版本都可以执行, 但是需要支持XML
1.3: WITH T1(A,NUM) AS ( Select name,ROW_NUMBER() OVER(PARTITION BY tbname ORDER BY tbname) as num FROM sysibm.syscolumns where tbname='T_SZPX_YL_GPXXB_TEST' ), t2(ra,num) as( Select A as a,NUM FROM T1 Where NUM = 1 UNION all Select RTRIM(T2.RA)||T1.A,t1.num FROM T1 , T2 Where T1.NUM = T2.NUM + 1) select ra,num from t2 where t2.num=(select max(num) from t1); -- 1.1 和 1.2 都不行的话只能采用递归SQL法了 以上SQL运行后效果如下图: 聚合前的数据格式: 聚合后的数据格式: 二. 实现 BETWEEN AND 功能,就是要查第5条到第8条数据。 2.1: select * from (select ROW_NUMBER() OVER(ORDER BY [排序的字段]) roolLine,t.* from [表名] t ) where roolLine BETWEEN 5 AND 8 |
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