请问sqlupdate如何使用元编程动态生成列名?
for (i in 0:10) {
colname = `position_ + string(i)
// update t2 set position_0 = 0 //想实现添加10列并设置为0
sqlUpdate(t2, <0 as sqlCol(colname)).eval() //报错
}
sqlUpdate(t2, sqlColAlias(<0>, colname))