可以用 replaceColumn! 函数实现:
syms = symbol(exec sym from t) replaceColumn!(t, `sym, syms); schema(t).colDefs;
如题,我有如下一个表:
sym = `C`MS`MS`MS`IBM`IBM`C`C`C price= 49.6 29.46 29.52 30.02 174.97 175.23 50.76 50.32 51.29 qty = 2200 1900 2100 3200 6800 5400 1300 2500 8800 timestamp = [09:34:07,09:36:42,09:36:51,09:36:59,09:32:47,09:35:26,09:34:16,09:34:26,09:38:12] t = table(timestamp, sym, qty, price) schema(t).colDefs;
需求是将这个内存表 t 的 sym 列的类型变为 SYMBOL。
请问有办法吗?
可以用 replaceColumn! 函数实现:
syms = symbol(exec sym from t) replaceColumn!(t, `sym, syms); schema(t).colDefs;