oracle 将一列数字分为多个为1的行
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比如:
abc 5
转换为
abc 1的5行数据
如果是10 就转为10行数据
From (select colA,num from table_name) a
left join (select rownum as rn from all_objects) b
on a.num>=b.rn追问
感谢 ,这个已经找到了,追问一下,在存储过程内delete语句无法执行,删除不了结果,怎么办,急啊
delete from wm_bagcoe_info a where to_char(a.cpi_sorting_date)=to_char(sort_date);
V_SQL_DELETE:=' delete from wm_bagcoe_info where to_char(cpi_sorting_date)='''||sort_date||'''';
execute immediate V_SQL_DELETE;
commit;
感谢
去掉表重命名的a
本回答被提问者和网友采纳根据多个条件将一列拆分为几列并分组
【中文标题】根据多个条件将一列拆分为几列并分组【英文标题】:Split a column into several columns based on several conditions and group by 【发布时间】:2021-11-25 23:49:18 【问题描述】:我有一个示例数据框,如下所示。
import pandas as pd
data = 'ID':['A','A','A','A','A','A','A','A','A','C','C','C','C','C','C','C','C'],
'Week': ['Week1','Week1','Week1','Week1','Week2','Week2','Week2','Week2','Week3',
'Week1','Week1','Week1','Week1','Week2','Week2','Week2','Week2'],
'Risk':['High','','','','','','','','','High','','','','','','',''],
'Testing':['','Pos','','Neg','','','','','Pos', '', '','','Neg','','','','Pos'],
'Week1_adher':['','','','','','','','','', '','','','','','','',''],
'Week2_adher':['','','','','','','','','','','','','','','','',''],
'Week3_adher':['','','','','','','','','','','','','','','','','']
df1 = pd.DataFrame(data)
df1
现在我想计算每个参与者每周的依从性。其计算如下: 如果参与者在一周内的测试栏中有 2 个或更多条目(正面/负面),则该周的坚持为“是”,否则为“否”
例如,对于参与者 A,第 1 周_adherence 为“是”,因为它在第 1 周的测试列中有 2 个条目。 Week2_adherence 为“否”
并且我希望将整周的依从性结果显示在每个参与者的第一行。
最终的数据框应该如下图所示。
我已经坚持了很长一段时间了。任何帮助是极大的赞赏。谢谢。
【问题讨论】:
【参考方案1】:试试:
adher = (df1.Testing.ne('') # check for non-empty string
.groupby([df1.ID, df1.Week]) # groupby ID and week
.sum().ge(2) # count and check >= 2
.unstack(fill_value=False)
.replace(True:'Yes', False:'No')
.add_suffix('_adher')
)
# the first lines
mask = ~df1['ID'].duplicated()
df1.loc[mask, adher.columns] = adher.loc[df1.loc[mask,'ID']].values
输出:
ID Week Risk Testing Week1_adher Week2_adher Week3_adher
0 A Week1 High Yes No No
1 A Week1 Pos
2 A Week1
3 A Week1 Neg
4 A Week2
5 A Week2
6 A Week2
7 A Week2
8 A Week3 Pos
9 C Week1 High No No No
10 C Week1
11 C Week1
12 C Week1 Negative
13 C Week2
14 C Week2
15 C Week2
16 C Week2 Positive
【讨论】:
适用于非空字符串(第一行)。如果它是 np.nan 值而不是空字符串怎么办?只需用 testing.ne(np.nan) 替换它?我试过这个,但不起作用。 使用notna()
而不是ne()
来检查非nan值。
知道了。非常感谢!。解决方案也很优雅。以上是关于oracle 将一列数字分为多个为1的行的主要内容,如果未能解决你的问题,请参考以下文章