mysql - SQL 查询更新

Question

任何帮助表示赞赏。我们需要更新 ibf_posts.author_id。我已经尝试过了，但它似乎不起作用。没有错误，但运行数小时后查询尚未完成。2.9g 数据库。ibf_posts 为 1.9g

UPDATE ibf_posts SET author_id = (SELECT member_id FROM ibf_members 
                 WHERE ibf_members.members_display_name = ibf_posts.author_name)

表：ibf_posts、ibf_members

ibf_posts.author_name = ibf_members.members_display_name

ibf_posts.author_id = ibf_members.member_id

[slinky = slinky]
[4814 = 4814]

但我们有：

[slinky = slinky]
[0 = 4814]

Answer 1

试试这样：

UPDATE ibf_posts, ibf_members
SET ibf_posts.author_id = ibf_members.member_id
WHERE ibf_members.members_display_name = ibf_posts.author_name;