更新同一列中的多个值

Question

我有一个名为 Movie_Stars 的数据 table。我想更新多个值，但它们都在同一列中。这是我拥有的：

update movie_stars
set movie_category = 'Family'
where movie_category = 'Drama'
and set movie_category = 'Children'
where movie_category = 'Cartoon'
and set movie_category = 'Teen'
where movie_category = 'Action';

但这会产生错误 "invalid user.table.column, table.column, or column specification"。那么什么是右栏规范呢？

Answer 1

使用CASE表达式：

update movie_stars
set movie_category = case when movie_category = 'Drama'
                          then 'Family'
                          when movie_category = 'Cartoon'
                          then 'Children'
                          when movie_category = 'Action'
                          then 'Teen'
                     end
where movie_category in ('Drama', 'Cartoon', 'Action')