英文:
How to pass multiple columns to replaceColumn! at once?
问题
如何使用replaceColumn!一次更改多个列的数据类型？
英文:
I want to change the data type of specific columns with replaceColumn!. But I can only pass one column at a time to the function.
How to change the data types of multiple columns with just one command?
答案1
得分: 1
在DolphinDB中，replaceColumn!(table,colName,newCol)支持更改仅一个列的数据类型，因为参数colName被设计为一个字符串标量。
要一次替换多列使用replaceColumn!，请使用each：each(replaceColumn!{t}, [col1, col2...], [newcol1, newcol2...])。
英文:
In DolphinDB, replaceColumn!(table,colName,newCol) supports changing the data type of only one column, because the parameter colName is designed as a string scalar.
To replace multiple columns at once with replaceColumn!, use each: each(replaceColumn!{t}, [col1, col2...], [newcol1, newcol2...]).
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