我想使用 SELECT 查询添加一个新列，并从 SQL 中的多个列中获取最新值

Question

Outcome1 Outcome2 Outcome3 Outcome4 DESIRED OUTCOME CR CR CR C CR CR CR N CR N CR CR C C C C C C C CC CC CR CC CC CR

Answer 1

It seems you simply need the first not-null value. If so, You can use COALESCE function -

SELECT COALESCE(Outcome1, Outcome2, Outcome3, Outcome4)
  FROM your_table;