wm_concat替代函數(shù) oracle中怎么統(tǒng)計(jì)listagg函數(shù)里面值的個(gè)數(shù)?
oracle中怎么統(tǒng)計(jì)listagg函數(shù)里面值的個(gè)數(shù)?1. 必須得分組,也就是說group by是必須的。2. listagg函數(shù)的第一個(gè)參數(shù)是需要進(jìn)行枚舉的字段,也就是ddate;第二個(gè)參數(shù)是枚舉
oracle中怎么統(tǒng)計(jì)listagg函數(shù)里面值的個(gè)數(shù)?
1. 必須得分組,也就是說group by是必須的。2. listagg函數(shù)的第一個(gè)參數(shù)是需要進(jìn)行枚舉的字段,也就是ddate;第二個(gè)參數(shù)是枚舉數(shù)值之間的分隔符;同時(shí)還需要進(jìn)行排序和分組within group (order by name) !
mysql中哪個(gè)和oracle中的listagg函數(shù)有相同功能?
用cast就可,但要填適當(dāng)?shù)念愋停纠?
select cast(11 as unsigned int) /*整型*/
select cast(11 as decimal(10,2)) /*浮點(diǎn)型*/
sqlserver有類似listagg函數(shù)嗎?
-字符串聚合,適用于SQLServer2005及以上--測(cè)試數(shù)據(jù)withtmp(column1,column2)as(select"A","aa"unionallselect"A","bb"unionallselect"A","cc"unionallselect"B","dd"unionallselect"B","ee")--用forxmlpath實(shí)現(xiàn)字符串聚合
oracle10g怎么實(shí)現(xiàn)listagg功能?
所有版本的oracle都可以使用wm_concat()函數(shù) 。例:select wm_concat(name) as name from user但如果是oracle11g,使用listagg() within group()函數(shù) 。例:select listagg(name, ‘,’) within group( order by name) as name from user使用wm_Concat:使用ListAgg:結(jié)果: